Intersil Corporation HSP50215EVAL Datasheet

HSP50215EVAL

User’s Manual January 1999 File Number

DSP Modulator Evaluation Board

Evaluation Kit

The HSP50215EVAL Kit provides the necessary tools to evaluate the HSP50215 Digital Upconverter integrated circuit and consists of a circuit board and a software program. The kit is designed for evaluation of Digital Quadrature Amplitude, FM, and Shaped FM modulation for IF Communications Applications. The circuit board uses baseband I and Q data patterns loaded through the 8-bit parallel interface or the ISAbus interface. Data is output as either a digital or analog modulated composite IF signal. Up to four channels can be included in the composite IF output. To facilitate the use of the board during evaluation, the kit includes example ﬁles for conﬁguration, shaping ﬁlters and input stimulus.

Circuit Board

The Functional BlockDiagram illustrates the major functions of the circuit board. The circuit board is a ISAbus form factor with 40 pin I/O header/connectors for cascade and output signals. Baseband test patterns are loaded through the ISAbus or 8-bit parallel interface. The external Cascade Input allows expansion of the number of channels in the composite signal. The board outputs data through both the RF connector and the 40 pin header. Test connectors are provided at key signal and control locations in the circuit.

4463.3

Features

• Multi-Channel Composite IF Output with 1-4 Channels

• Digital or Analog Composite Output

• Baseband Pattern Stimulus Files with Lengths to 64Kbits

• Example Baseband Patterns for BPSK, QPSK,

π/4QPSK,

16QAM, FM, GMSK and AWG Noise

• Baseband Patterns Loaded to RAM Via PC ISAbus or Parallel Port, for Use as Modulator Baseband Data

• DOS Based Conﬁguration/Status Software

Applications

• Evaluation Tool for the Performance of the Digital UpConverter Conﬁgured as PSK, Quadrature Amplitude (QAM), FM and Shaped FM (MSK) Modulators at Rates from <1 KBPS to 1.5 MBPS

• Performance Evaluation Tool for Digital Upconversion

• Communications Test Equipment

Functional Block Diagram

40 PIN

CONNECTOR

16 16 16

(CASCADE

INPUT)

-12V

DAT A

ADDRESS

PARALLEL

ISABUS

HSP50215

DIGITAL

UPCONVERTER

CHANNEL 4

FPGA

RAM

(INPUT DATA PATH AND CONTROL/STATUS INTERFACE)

(OPTIONAL FINAL STAGE BASEBAND DATA INPUT PATH)

DAT A

ADDRESS

DAT A

ADDRESS

-12V

HSP50215

DIGITAL

UPCONVERTER

CHANNEL 3

FPGA FPGA FPGA

RAM RAM RAM

ADDRESS DECODE

HSP50215

DIGITAL

UPCONVERTER

CHANNEL 2

INTERFACE BUS

CLK

HSP50215

DIGITAL

UPCONVERTER

CHANNEL 1

OSC

D/A

HI5741

INTERNAL CLOCKS

40 PIN

CONNECTOR

DIGITAL

ANALOG

IF OUTPUT

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

http://www.intersil.com or 407-727-9207

HSP50215EVAL

Table of Contents

Functional Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Control Software Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

FIGURE 1. MENU TREE FOR THE CONTROL/STATUS SOFTWARE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Conﬁguration/Test Headers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Typical Evaluation Conﬁguration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Getting Started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Evaluation Circuit Board Conﬁguration and Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Requirements for the Control Software Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Installing the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

FIGURE 2. TYPICAL MODULATOR PERFORMANCE EVALUATION CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Verifying the Control Software and Board Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

FIGURE 3. MAIN MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

FIGURE 4. BOARD INTERFACE SUBMENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

FIGURE 5. TEST SUBMENU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Running the Control Software for Evaluation Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

FIGURE 6. MODULATOR CHANNEL CONFIGURATION SUBMENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

FIGURE 7. BOARD INTERFACE SUBMENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

FIGURE 8. CONFIGURE CHANNEL 1 SUBMENU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Learning Your Way Around. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Exercise #1: Generating A CW Tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Exercise #2: Adjusting the level of the CW Tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Exercise #3: Modulating the CW Tone with PN Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Exercise #4: CW and a Modulated Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Exercise #5: A Fourier Series Composite Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Exercise #6: Generating Additive White Gaussian Noise (AWGN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Background on Eb/No and SNR Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

An Example Eb/No Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Exercise #7: PRBS Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Generating User Conﬁgurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Detailed Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Signal Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Modulation Channel 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Modulation Channel 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Modulation Channel 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Modulation Channel 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

PC/Controller Interface Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

ISA Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Parallel Interface Conﬁguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Jumpered Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Power Supply Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Advanced Evaluation Conﬁgurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Non ISA (PC installed) Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Direct Modulator Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Using SERINADE™ Designed Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Appendix A - Circuit Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Appendix B - Initial Jumper Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Appendix C - Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Appendix D - Test Header Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Appendix E - Detailed Schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Appendix F - Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Appendix G - Descriptive File List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Example Conﬁguration Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Example Filter Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

FIGURE 9. IS136B.IMP FREQUENCY RESPONSE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

FIGURE 10. RRC2A4X.IMP FREQUENCY RESPONSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

FIGURE 11. GS5T16X.IMP FREQUENCY RESPONSE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

FIGURE 12. S95MOD.IMP FREQUENCY RESPONSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

FIGURE 13. AMPS2.IMP FREQUENCY RESPONSE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

FIGURE 14. RRC35A4X.IMP FREQUENCY RESPONSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

FIGURE 15. GP1.IMP FREQUENCY RESPONSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

FIGURE 16. GP2.IMP FREQUENCY RESPONSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Example Stimulus Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Appendix H - Detailed Menu Item Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

PAGE

HSP50215EVAL

Control Software Program

The control software program, written for DOS based PC’ s , is included in the evaluation kit. This software supports operation of the evaluation circuit board in basic quadrature ASK and FM modulation configurations

The control software MAIN MENU offers six submenus f or various configuration selections and three command actions. The menu tree is illustrated in Figure 1.

The 7 configuration submenus are:

• Board Configuration Menu

• Modulator Channel 1 Configuration Menu

• Modulator Channel 2 Configuration Menu

• Modulator Channel 3 Configuration Menu

• Modulator Channel 4 Configuration Menu

• Configure Board Menu

• Test Menu

The four command actions are:

• Load Configuration File

• Save Configuration File

• Compute Registers

• Exit

A typical operational sequence is: A. Load Configuration File Executing MAIN MENU item (5) brings up a screen with the

current file name and requests the name of the file to be loaded. Once the new file name is entered, this command loads the configuration setup and returns to the MAIN MENU screen. This command allows the user to select a previously saved configuration file f or displa y, revie w and editing.

B. Edit Configuration File This is done by sequencing through each of the configuration

submenus and adjusting the parameters for the desired hardware configuration.

- The BOARD CONFIGURATION MENU is used to select

control interface type, printer port (PRN) number, FPGA addressing, and oscillator frequency.

- The MODULA TOR CHANNEL CONFIGURA TION

MENUS are used to select carrier center frequency , input sample rate, modulation type, coefficient file name, interpolation factor, impulse response length, Stimulus file name, number of data samples, output attenuation, output enabling, cascade input control, synchronization, synchronization polarity , FIFO depth, Output F ormat, and test register settings. There is a menu for each of the f our modulator channels on the evaluation board.

C. Save Configuration File Executing MAIN MENU item (6) brings up a screen with the

current file name and a request for a file name to be saved. Once the new file name is entered, this command stores the configuration setup to the new file.

WARNING: Failure to change the .cfg file name may result in overwriting of an example file with an edited version of that file.

D. Compute Registers This command will use the configuration data entered in MAIN

menu items 0-4, and generate a number of files which contain the register values for the IC’s on the evaluation circuit board. The computation is based on a .cfg file, which contains filter (.imp) and stimulus (.imp) files for each of the 4 channels.The computed register values are stored in a set of files identified by the suffix of .1, .2, .3 and .4, indicating the channel to which the parameters apply. The actual filename preceding the .1, .2, .3 or .4 suffix is automatically assigned to be the Configuration file filename.

MAIN MENU

(5) LOAD CONFIGURATION FILE (6) SAVE CONFIGURATION FILE

(0) (1) (2) (3) (4) (8)

BOARD

CONFIGURATION

ENTER

NEW

(1)

VALUE

ENTER

(7)

NEW

VALUE

MODULATOR MODULATOR

CHANNEL 1

CONFIGURATION

ENTER

(1) (1)

(16) (16)

NEW

VALUE

ENTER

NEW

VALUE

CHANNEL 2

CONFIGURATION

ENTER

NEW

VALUE

ENTER

NEW

VALUE

CONFIGURATION

(1)

(16)

(7) COMPUTE REGISTERS

(10) EXIT

MODULATOR

CHANNEL 3

ENTER

NEW

VALUE

ENTER

NEW

VALUE

MODULATOR

CHANNEL 4

CONFIGURATION

ENTER

(1)

(16)

NEW

VALUE

ENTER

NEW

VALUE

FIGURE 1. MENU TREE FOR THE CONTROL/STATUS SOFTWARE

CONFIGURE

BOARD

COMMAND

(1)

COMMAND

(5)

(9)

TEST

COMMAND

(1)

(3)

COMMAND

HSP50215EVAL

E. Conﬁgure Board Menu This command accesses a menu called the BOARD,

INTERFACE MENU. The BOARD, INTERFACE MENU is used to select among several board conﬁgure command options, including conﬁgure channel 1, conﬁgure channel 2, conﬁgure channel 3, conﬁgure channel 4, or conﬁgure all modulator channels.

D. Test Menu This command accesses a menu called the TEST MENU.

The TEST MENU is used to select among several “run” options, including reset the board, write to a location while reset, read to a location while reset, write to a location while running, or read from a location while running.

For a detailed listing of every Menu screen, with selection item deﬁnitions, refer to Appendix G - Descriptive File List.

Conﬁguration/Test Headers

Fifteen dual row test headers located on the evaluation circuit board are used to monitor signals and set control pins. The pin assignments for each of these headers are found in Appendix D - Test Header Pin Assignments.

Typical Evaluation Conﬁguration

Figure 2 identiﬁes the conﬁguration of a typical performance evaluation setup. A test PRBS data pattern is created via a stimulus ﬁle and used by a modulator to generate a modulated IF signal. Noise and other signal impairment stimulus ﬁles can be used with additional channels to create a cascaded/summed composite IF signal that is routed to a D/A converter (DAC), generating an output analog signal. The digitized IF signal is also routed out of the circuit board allowing multiple boards to be cascaded together. To check out a complete communication systems, the modulator output can be routed to a demodulator, whose baseband output is connected to a Bit Error Rate Tester (BERT) for measuring the Bit Error Rate (BER) performance.

Getting Started

Evaluation Circuit Board Conﬁguration and Set Up

1. ___ Power down the host PC and remove the cover to allow access to the motherboard empty slots.

2. ___ Review the jumper configuration of the HSP50215EVAL Board to verify that the jumpers are properly set for the configuration desired. Appendices B (especially the jumper diagram at the end of the appendix), D and E will be helpful in this verification.

3. ___ Install the HSP50215EVALintoone of the empty ISA slots on the host PC motherboard. Make sure that a good connection is made with the motherboard and that the connectors fit in the slots in the rear of the PC chassis properly. Record the oscillator frequency for future reference: ____ ____ ____Hz

4. ___ Re-install the PC chassis cover and power up the computer.

The circuit board is ready for use.

Requirements for the Control Software Program

In order to properly operate the HSP50215EVAL Control Software Program included in the evaluation kit, the PC must meet the following requirements:

PC/XT/AT or 100% compatible with a minimum of 640K of RAM

DOS Version 3.0 or higher. One parallel port with 25 pin connector.

Installing the Software

The instructions that follow will load both the HSP50215EVAL software onto the “C” driveof the computer. If you do not wish to run the software from the “C” drive, consult your computer user’s manual for operation from another drive. It is “good practice” to backup original disks prior to installing the software on your computer.

1. ___ Insert the HSP50215EVALdistribution disk in DriveA and copy the contents of the distribution diskette to the targetdirectory on DriveC.

a way as to retain the file structure of the distribution disk.

Note: Thismust be donein such

CHANNEL #1

STIMULUS FILE

CHANNEL #1

FILTER FILE

CHANNEL #4

STIMULUS FILE

CHANNEL #4

FILTER FILE

CONFIGURATION FILE

CHANNEL #1

STIMULUS FILE

CHANNEL #1

FILTER FILE

CHANNEL #4

STIMULUS FILE

CHANNEL #4

FILTER FILE

CONFIGURATION FILE

FIGURE 2. TYPICAL MODULATOR PERFORMANCE EVALUATION CONFIGURATION

PERSONAL COMPUTER

HSP50215EVAL

EVALUATION BOARD

ANALOG IF OUTPUT

DIGITAL IF OUTPUT

HSP50215EVAL

2. ___ If a FIR filter design software tool is desired, then downloading SERINADE from the Intersil Corporation website into the target directory is recommended. The web site is found at www.intersil.com and SERINADE is found under the Products column of the home page. Select

Products Listing ment Tools

menu item. Select the

Digital Signal Processing

menu item. Select the

SERINADE

Develop-

menu item. Download of SERINADE can be done from this location.

The software must be run from the new target directory established on the C drive.

Verifying the Control Software and Board Installation

1. ___ On the PC, change the directory to the target directory where the control software has been installed.

2. ___ Start the program by typing: HSP50215 <Enter>.

3. ___ The MAIN MENU screen will appear. It will look like Figure 3.

+------------------------------------+ | HSP50215 EVALUATION BOARD SOFTWARE | +------------------------------------+

MAIN MENU

(0) Board Configuration (1) Modulator Channel 1 Configuration (2) Modulator Channel 2 Configuration (3) Modulator Channel 3 Configuration (4) Modulator Channel 4 Configuration (5) Load Configuration File (6) Save Configuration File (7) Compute Registers (8) Configure Board (9) Test Menu (10) Exit ENTER SELECTION: =

FIGURE 3. MAIN MENU

4. ___ Select item (0) for board configuration and type <Enter>. The BOARD INTERFACEMENU will appear as shownin Figure 4. Use the menu items to change the default board configuration to match the ev aluation board interface, printer, FPGA addressing and oscillator frequency that you desire. Verify that these settings match the jumper configuration of your evaluation board.

5. ___ Whenyouhavecompleted makingyourmodifications, selectitem (0) and type <Enter> to returnto the MAIN MENU.

6. ___ Select Main Menu item (9) and type <Enter> to enter the Test Menu. The Test Menu is shown in Figure 5.

7. ___ Select Test Menu Item (6) and type <Enter> to enter the Test Board submenu.

8. ___ A screenappearsthat indicatestheRAMAddress/Data Bus test results and the HSP50215 data bus test

results.Ifalltheitemshavepassedthetest,theboard and software have been properly installed and you are ready to begin evaluation testing. Skip to step 12. If any test failed, proceed to step 9.

9. ___ If one of the tests shown on the screen for step 8 did not pass, then the board jumper configuration should be reviewed, as it is the most lik ely culprit.

+-------------------------------------+

| HSP50215 EVALUATION BOARD SOFTWARE | +------------------------------------+

BOARD INTERFACE MENU

File Name ................ EXAMPLES\EX01QPSK

(1) Interface ...................... ISA

(2) ISA Base Address ............... 0x300

(3) Channel 1 FPGA Address ......... 0

(4) Channel 2 FPGA Address ......... 1

(5) Channel 3 FPGA Address ......... 2

(6) Channel 4 FPGA Address ......... 3

(7) Oscillator Freq ........... 50000000 Hz

(0) Main Menu

ENTER SELECTION:

FIGURE 4. BOARD INTERFACE SUBMENU

+------------------------------------+ | HSP50215 EVALUATION BOARD SOFTWARE | +------------------------------------+

TEST MENU

File Name................... EXAMPLES\EX01QPSK

(1) Reset Board (2) Write to Location While Reset (3) Read from Location While Reset (4) Write to Location While Running (5) Read from Location While Running (6) Test Board (0) Main Menu ENTER SELECTION:

FIGURE 5. TEST SUBMENU

10. ___ Next, the physicalinstallation should be checked.

11. ___ If the board is properly installed, then a verify that no ISAbus card addressing contention exists. Steps 9, 10, AND 11 are the leading causes of board test failure.

HSP50215EVAL

Running the Control Software for Evaluation Testing

12. ___ From the MAIN MENU, select the first MODULATOR CONFIGURATION MENU, item (1), by typing: 1<Enter>. The MODULATOR CHANNEL 1 CONFIGURATION MENU will appear. It should match the entry found in Figure 6.

13. ___ Make any adjustments to the parameters by entering the desired item number for parameter selection and editing each item via the respective parameter entry submenu. When editing is complete, select item (0) and type <Enter> to return to the MAIN MENU.

+------------------------------------+ | HSP50215 EVALUATION BOARD SOFTWARE |

+------------------------------------+

File Name............. EXAMPLES\EXO1QPSK

Channel 1

(1) Carrier Center Freq....... 5000000 Hz

(2) Input Sample Rate......... 24300 Hz

(3) Modulation Type........... QASK

(4) Coef File.............. FILTERS\ISA135B

(5) Interpolation (IP)........ 16 phase

(6) Impulse Response Length (DS).16 samples

(7) Stimulus File......... STIMULUS\QPSKPN

(8) # Data Samples:........... 1022

(9) Output Attenuation........ +15dB

(10) Output.................... Enabled

(11) Cascade Input............. Enabled

(12) Sync...................... Internal

(13) Sync Polarity............. L -> H

(14) FIFO Depth................ 3

(15) Output Format........... Offset Binary

(16) Test Register............. 0

(0) Main Menu ENTER SELECTION:

17. ___ Select MAIN MENU item (8) by typing 8 <Enter>. The BoardInterfaceMenuwillappearasshowninFigure 7.

18. ___ If youhaveidentifiedmore than one channel for operation, selection of menu item (5) will load all the channels with one command. See step 25 for this action. In testing, there are times when most of the channels will remain the same and one channel or one channel input will change. Menu items (1) through (4) are for selective channel or channel input configuration. Select the menu item (1), CONFIGURE CHANNEL 1 MENU, of the BOARD INTERFACE MENU by typing 1<Enter>. A menu will appear with three execution options, as shown in Figure 8. This is the same menu that will appear when BOARD INTERFACE MENU items (2) through (5) are selected.

+------------------------------------+ | HSP50215 EVALUATION BOARD SOFTWARE | +------------------------------------+

BOARD INTERFACE MENU

File Name................... EXAMPLES\EXO1QPSK

(1) Configure Channel 1 (2) Configure Channel 2 (3) Configure Channel 3 (4) Configure Channel 4 (5) Configure All Channels

(0) Main Menu

ENTER SELECTION:

FIGURE 6. MODULATOR CHANNEL CONFIGURATION SUB-

14. ___ Repeat Steps 12 and 13 for MAIN MENU items (2), (3), and (4). These submenus control Modulator Channels 2 through 4. These submenus are identical to those found under MAIN MENU (1) with the exception of the Channel Number and the names of the coefficient file, and stimulus file.

15. ___ Select MAIN MENU item (6) by typing 6 <Enter>. This will save the edited configuration file. Y ou are prompted for a file name for your new configuration.

WARNING: Failure to change the .cfg file name may result in overwriting of an example file with an edited version of that file.

16. ___ Select MAIN MENU item (7) by typing 7<Enter>. This will compute the configuration register values and generatethe.1, .2, .3, and .4 files. (Filter and stimulus files with .imp file extensions must be created prior to running the HSP50215EVAL software - See Appendix G - Descriptive File List) Note that MAIN MENU items 1 through 7 can be executedwithout the evaluation circuit board installed.

FIGURE 7. BOARD INTERFACE SUBMENU

19. ___ Select the desired action from the three choices in

(1) Modulator (2) Pattern RAM (3) Both

ENTER NEW VALUE [1]:

FIGURE 8. CONFIGURE CHANNEL 1 SUBMENU

the BOARD INTERFACE submenu. The MODULATOR item does an initialization of the designated channeland begins normal operation of that channel. The PA TTERN RAM menu item allows individual STIMULUS files to be downloaded. Selecting item (3), allows both channel and stimulus configuration with one command. Selection of an item will return the user to the BOARD INTERFACE submenu.

20. ___ Items (2), (3), and (4) of the BOARD INTERFACE submenu, configure only channel 2, 3, and 4 on the board, respectively. Configure these channels and return to the main BOARD INTERFACE submenu.

HSP50215EVAL

21. ___ Item (5) of the main BOARD INTERFACE submenu does a full initialization and configuration of all four channels on the board. Item (5) should be selected wheneverthe board has been reset. After that, items (2), (3) or (4) can be selected for a faster update.

22. ___ Select HARDWARE INTERFACE submenu item (0) by typing 0 <Enter>. This returns the user to the MAIN MENU. You have now configured your board for its first test configuration. Youmaylook at the output with a scope or spectrum analyzer to verify that the board is operating as desired.

23. ___ If the output is not as expected, review the configuration of all of the channels to be sure that you have properly selected the stimulus, filtering and configuration.

24. ___ When designing a newconfigurationsornewstimulus, it is best to begin by editing the example file that most closely matches the desired signal or configuration.

Learning Your Way Around

This Section provides a step by step walk through of some exercises to familiarize the user with the software screens and the techniques used to generate a variety of stimulus and conﬁgurations of the HSP50215EVAL Board. If the DAC output is routed to a scope or a spectrum analyzer, then a visual veriﬁcation can be made of the conﬁguration changes. Note that these exercises assume that the concluding conﬁguration of the previous exercise is the conﬁguration of the board at the start of the next exercise. The ﬁrst exercise conﬁgures all channels to ensure success.

Exercise #1: Generating A CW Tone

This exercise will demonstrate the creation of a CW test tone. The purpose of this exercise is to illustrate the generation of a signal that is useful in a variety of testing conﬁgurations.

Go to the main menu. Select Item (5), Load Conﬁguration File, and enter the following ﬁle name and path: examples/ex01qpsk <Enter). Select Item (1), Modulator Channel 1 Conﬁguration, and enter the following parameters:

(1)500,000Hz (2)50,000Hz (3)QASK (7)Stimulus\bpskpn

Note: If you have not properly identiﬁed the stimulus ﬁle or the path to that ﬁle, then the program will not download when you command the software to conﬁgure the board, and will return you to the DOS prompt at which point you will need to restart the control software and start from scratch on the conﬁguration.

(8)1 (9)3 (0)Returns to main menu This configures channel one input stimulus to be a single bit,

sampled at 50kHz, and applied to a 500kHz QASK modulator

(See note below before leaving this item).

with 3dB attenuation. The filter has a data span of 16 samples and 16 interpolation phases, and is referenced by the filter filename IS136B. Notice that it was setting item (8) to 1 that repeatedly sent a single bit to the modulator, creating the CW.

Select main menu item (2) and set the following parameters: (1)250,000Hz (2)25,000Hz (3)QASK (7)Stimulus\bpskpn

(See note below before entering this item)

(8)511 (9)48 (0)Returns to main menu

This conﬁgures channel two to be a 25Kbps PSK modulator at 250kHz, but with the RF severely attenuated so as to be effectively turned off. The IS136B ﬁlter is used here, as well as in Channel 1.

Select main menu item (3) and set the following parameters: (1)750,000Hz

(2)75,000Hz (3)QASK (7)Stimulus\bpskpn

(See note below before leaving this item).

(8)511 (9)48

(0)Returns to main menu This conﬁgures channel three to be a 75Kbps PSK

modulator at 750kHz, but with the RF severely attenuated so as to be effectively turned off. Once again, the IS136B ﬁlter is used.

Select Item (4) and set the following parameters: (1)500,000Hz

(2)501,000Hz (3)QASK (5)0 (6)4 (7)Stimulus\gn16k

(See note below before leaving this item)

HSP50215EVAL

(8)16384 (9)48 (0)Returns to main menu This conﬁgures channel four to be a 351Kbps PSK

modulator at 500kHz with a Gaussian White Noise input and with the RF severely attenuated so as to be effectively turned off.

Select main menu item (6), save conﬁguration ﬁle and enter the following ﬁle name and path: examples/exercise.

Select main menu (7) to compute the register values. Select main menu (8) to conﬁgure the board. Select submenu item (5) to conﬁgure all channels. Select submenu item (3) to load both the modulator and

Pattern RAM. When the submenu reappears, the download is complete

and the scope or spectrum analyzer should show a single CW tone at 500kHz at approximately 0.4Vpp.

Exercise #2: Adjusting the level of the CW Tone

This exercise will demonstrate the technique used in adjusting the output amplitude of the CW test tone via the Gain Control signal of the Digital Upconverter. This is but one technique that can be used to set the level, noting that scaling the input ﬁle can achieve the same result. The HSP50215 data sheet notes that care must be taken in setting the signal levelat the input to the shaping ﬁlter, at the input to the interpolation ﬁlter, at the input to the mixer, and at the cascade summer. Attention to these points will eliminate the unwanted limiting or roll-over. The purpose of this exercise is to introduce the user to a technique for setting test signal levels.

Go to the main menu. Select Item (1), Modulator Channel 1 Conﬁguration, and enter the following parameters:

(9)9 (0)Returns to main menu This will reduce the output level by 6dB. Select main menu (7) to compute the register values. Select main menu (8) to conﬁgure the board. Select submenu item (1) to conﬁgure channel 1. Select submenu item (1) to load the modulator. When the submenu reappears, the download is complete

and the scope or spectrum analyzer should show a single CW tone at 500kHz at with half the amplitude of the signal in Exercise 1. Note that if we had set the value to 48, the channel is effectively turned off. Setting the value to 0 is the maximum output level, but there is the risk that clipping will occur when other signals are added into the CW tone.

Exercise #3: Modulating the CW Tone with PN Data

This exercise will demonstrate the creation a BPSK signal using a Random PN sequence as a stimulus. The BPSK stimulus will write the following values as (I,Q) pairs into the modulator: (-0.707, -0.707), (+0.707, +0.707). This will generate a BPSK signal. The purist may wish to edit this ﬁle to have the values (+1,0), (-1,0), but the 45 not of concern, in general. The purpose of this exercise is to demonstrate BPSK and provide insight into creating useful test stimulus ﬁles, as well as to learn techniques for quick test conﬁguration.

Go to the main menu. Select Item (1) and set the following parameters:

(8)24 (9)3 (0)Returns to main menu This will return the output level to the original setting. Select main menu (7) to compute the register values. Select main menu (8) to conﬁgure the board. Select submenu item (1) to conﬁgure channel 1. Select submenu item (1) to load the modulator. When the submenu reappears, the download is complete

and the scope or spectrum analyzer should show a ﬁltered, modulated signal at an output levelof approximately 0.4Vpp. There should be 10 IF cycles per baud and the baud rate is 50kHz. Notice that it was setting item (8) to 24 that sent a PN sequence to the modulator. The previous value of 1, held the modulator at CW using an input of either a (-0.707, -0.707) or (+0.707, +0.707).

Note that if a particular data pattern is required, copying and editing the PN stimulus ﬁle for the number of data samples that you desire, is a quick way to perform an impulse response or some other useful test pattern such as 1/0 or

1000. Just remember to use the channel conﬁguration menu to only select the number of data samples to match the entries that you have altered in the new ﬁle. Also,selecting a standard PN length (2 Error Rate Tester to be used in conjunction with this modulator in evaluation of the communication link.

Notice also, that the various options for conﬁguring the board are designed to save time during evaluation. If the only parameters that have changed involve one modulator, then the quickest conﬁguration update downloads only the parameters for that modulator. The next quickest update is if the Pattern RAM and modulator for that single channel are all that need downloading. You will appreciate this as you apply the larger stimulus ﬁles, like the AWGN ﬁles. The longest download involves updating the modulator and Pattern RAM ﬁles for all channels.

-1, 215-1) allows a commercial Bit

phase offset is

HSP50215EVAL

Exercise #4: CW and a Modulated Signal

This exercise simulates a CW jammer interferer with a signal of interest. The affect of interference is determined by how close in frequency the CW is to the desired signal and what the relative amplitude is to the signal of interest. We will use the pre-conﬁgured channel 1 as the modulated signal and conﬁgure channel 2 to be the interfering CW. The purpose of this exercise is to introduce the user to simple dual channel operation.

Go to the main menu. Select Item (2) and set the following parameters:

(8)1 (9)6 (0)Returns to main menu This will set channel 2 to CW at 3dB lower than the

modulated signal level and at half the frequency. Select main menu (7) to compute the register values. Select main menu (8) to conﬁgure the board. Select submenu item (2) to conﬁgure channel 2. Select submenu item (3) to load both the modulator and

Pattern RAM. When the submenu reappears, the download is complete.

This particular signal is easier seen on the spectrum analyzer than the scope. The CW is set at half the frequency of the modulated signal. By turning one of the signals on and off you can convince yourself that the desired combination of signals is present. The power of the four channel modulator should now be apparent. For signal testing, it is possible to generate the signal of interest, two adjacent signals, and an interferer signal. This test conﬁguration is ideal for high signal to noise, multi-channel applications.

Exercise #5: A Fourier Series Composite Signal

This exercise will demonstrate the use of 3 modulator channels conﬁgured as CW tones. The fundamental will be set at 12dB attenuation, the second harmonic at 18dB attenuation and the third harmonic at 24dB attenuation. The purpose is to introduce the operator to multiple channel conﬁgurations.

Go to the main menu. Select Item (1) and set the following parameters:

(8)1 (9)18 (0)Returns to main menu Select Item (2) and set the following parameters: (8)1 (9)12

(0)Returns to main menu Select Item (3) and set the following parameters: (8)1 (9)24 (0)Returns to main menu Select main menu (7) to compute the register values. Select main menu (8) to conﬁgure the board. Select submenu item (5) to conﬁgure all channels. Select submenu item (3) to load both the modulator and

Pattern RAM. When the submenu reappears, the download is complete. The output is the composite of three CW tones related by

harmonics and set at decreasing amplitude. The result is a cyclical output. Note that the relative start phase of each CW tone on each channel is determined by the relative time of the channel conﬁguration load. For example, by reconﬁguring individual channels (modulator only) you can change the relative phase of the CW’s, changing the Fourier Series, resulting in a different shape output waveform. You mayalso ﬁnd it interesting to adjust the amplitudes to try and approximatea square wave.Adding the fourth modulator will improve the approximation, remembering that these exercises depend on the conﬁguration returning to the last one called out, in order for the next exercise to work.

Exercise #6: Generating Additive White Gaussian Noise (AWGN)

This exercise will demonstrate the use of the “gn” stimulus ﬁles. Noise will be considered alone, at ﬁrst, then a modulated signal will be added. The Gaussian Noise stimulus ﬁles were generated with MATLAB®using the code commands:

a = randn(8192,2); b = 0.25*[a(:,1)/std(a(:,1)),a(:,2)/std(a(:,2))]; This is a sequence of numbers that are randomly selected in

the range of [-1 to +1], scaled by 0.25 for 4σ limiting, normalized to set the standard deviation to exactly 0.25. This baseband signal is input at the sample rate and will be modulated to the IF set in parameter (1) of the modulator channel being used for noise generation. As a rule of thumb, set the AWGN sample rate to either a value that is at least 10 times the data sample rate, or at a value close to the IF BW, but make it a prime number not an even multiple of the data sample rate. The other parameter that determines the randomness of the noise is setting (8), the number of data samples. Two stimulus ﬁles have been created and the ﬁle name includes the number of samples. The pn16k ﬁle has 16K data samples and the pn8K has 8K data samples. Since the noise is averaged over the number of samples, once the number becomes relatively large, the differences is primarily

MATLAB® is a registered trademark of The MathWorks, Inc.

HSP50215EVAL

the amount of time you care to wait to load the ﬁle. A rule of thumb is to use as large a number as possible. Note that the start of the noise sequence is determined by when the stimulus ﬁle for that channel is loaded. If multiple channels are required to be started together, then the board should be set to use the internal synchronization logic to respond to a single

external SYNCIN command. In noise applications, a random start on the various channels is often the desired condition. The purpose of this example is to demonstrate both using noise stimulus for ﬁlter shape evaluation and for establishing signal plus noise conﬁgurations.

Go to the main menu. Select Item (1) and set the following parameters:

(8)511 (9)48 (0)Returns to main menu Select Item (2) and set the following parameters: (8)511 (9)48 (0)Returns to main menu Select Item (3) and set the following parameters: (8)511

Go to the main menu. Select Item (1) and set the following parameters:

(9)3 (0)Returns to main menu Select main menu (7) to compute the register values. Select main menu (8) to conﬁgure the board. Select submenu item (1) to conﬁgure channel 1. Select submenu item (1) to load the modulator. When the submenu reappears, the download is complete.

The output is AWGN summed with modulated signal. The ﬁnal step is to determine how to set a particular Signal

to Noise Ratio (SNR). In order to determine a C/N or E the following system information must be known:

1)The vector length of the I/Q data vector. (This is the magnitude of the input vector).

2)The standard deviation of the I and Q components of the noise pattern vector.

3)The DC gains of the data and noise ﬁlters.

4)The input sample rates for the data and noise modulators (it is assumed that the noise sample rate is higher than the data sample rate).

b/No

(9)48 (0)Returns to main menu Select Item (4) and set the following parameters: (1)500,000Hz (2)501,000Hz (3)QASK (4)Filters/bypass (8)16384 (9)3 (0)Returns to main menu Select main menu (7) to compute the register values. Select main menu (8) to conﬁgure the board. Select submenu item (5) to conﬁgure all channels. Select submenu item (3) to load both the modulator and

Pattern RAM. When the submenu reappears, the download is complete.

The output is a Gaussian Noise signal, sampled at 351kHz and modulated to 500kHz IF. On a spectrum analyzer the outline of the shaping ﬁlter is depicted. On the scope, a noisy signal that is 0.4Vpp is displayed.

5) The noise bandwidth of the noise ﬁlters.

6) The multiplier settings for the gain in the modulators. Items 1 through 5 are listed in the headers of the ﬁle or in the

control software menus. Item 6 can be obtained from the computed register values found in the .1, .2, .3 and .4 ﬁles.

Background on Eb/No and SNR Calculations

The signal to noise ratio (C/N) is equal to: C/NdB = 10LOG(A2/2σ2) where σ is the standard deviation of the I and Q noise

vectors (they are equal), and A is the average length of the I/Q vector.

The length of the I/Q vector in the stimulus ﬁle is modiﬁed by the gain of the shaping ﬁlter and the gain of the programmable attenuator in the HSP50215. The standard deviationof the noise vector is likewise modiﬁed by the gains of the ﬁlter and the attenuator.

After obtaining C/N, conversion to Eb/No is done by normalizing for the data rate, NBW of the noise ﬁlter, and the modulation type as follows:

=C/N-ModFactor-10LOG(symbol rate)+10LOG(NBW).

b/No

where NBW is the double sided noise bandwidth of the noise ﬁlter.

Now lets add back in a modulated signal.

HSP50215EVAL

Adding the log of the noise bandwidth converts from C/N to C/No. Subtracting the log of the symbol rate converts from C/No to Es/No. The modulation factor converts from Es/No to Eb/No using the equation:

MF = 10LOG[bits/symbol] This yields MF = 0dB for BPSK, MF = 3.01dB for QPSK, and

MF = 4.77dB for 8 PSK.

An Example Eb/No Calculation

Data File: QPSKPN, A = 1.0, F Noise File: GN16K, std dev. = 0.25, F Data ﬁlter: IS136B, DC gain = 0.658, NBW = 1.004 x F Noise ﬁlter: RRC35A4xDC gain = 0.5, NBW = 0.989xF Signal Atten: 20 dB, 26 / 256 = 0.1016 Noise Atten:

14.6 dB, 48 / 256 = 0.1875 Begin by calculating C/NdB: C/NdB= 10LOG((1.0x0.658x0.1016)2/2(0.25x0.5x0.1875)2) = 10LOG((4.4693x103)/(1.0986x103)) = 6.094dB Continue by calculating Eb/No: Eb/No= 6.094-3.01-10LOG(128,000)+10LOG(0.989x400000) = 3.084 - 51.072 + 55.973 = 7.98dB Note that the values for A, standard deviation, DC gains, and

noise bandwidths are found in the ﬁle headers of the example ﬁlter and stimulus ﬁles provided. When main menu item (7) is executed, four conﬁguration ﬁles are generated, for the various channels. These ﬁles list the hex values for all of the control registers of the HSP50215. The channel (1, 2, 3, or 4) is indicated by the ﬁle sufﬁx. The value of the multiplier for the attenuators is found in Register 17. This value, converted to decimal and divided by 256, yields the linear attenuation multiplier value.

Note that there is an error introduced due to the 8-bit quantization of the gain control value. The error is small for attenuations close to 0dB but can be on the order of a tenth of a dB for attenuations greater than 15dB and as much as 1dB at the bottom of the range.

= 128ksym/sec

SAMP

= 400ksamp/sec

SAMP

Exercise #7: PRBS Data

This exercise will conﬁgure the board to bypass the ﬁlter and not upconvert, so that the user PRBS data is output. This conﬁguration is useful for verifying stimulus ﬁles that are short data sequences.

Go to the main menu. Select item (I) and set the following parameters:

(9)48 (0)Returns to the main menu This turns channel 1 off. Select main menu, item (4) and set the following parameters: (1)0 (7)Stimulus/bpskpn (8)15 (9)3 (0)Returns to the main menu This sets the channel 4 stimulus ﬁle to be a 15 bit PRBS.

The ﬁlter was already set to bypass. The IF is set to 0Hz. Select main menu item (7) to compute the register values. Select main menu item (8) to conﬁgure the board. Select submenu item (5) to conﬁgure all 4 channels. Select sumenu item (3) to load both the modulator and

pattern RAM. When the submenu reappears, the download is complete.

The output wavefor m should be the input PRBS data pattern. You should note that this configuration can be used to verify the maximum input rate by changing the input sample rate of channel 4 to be < f sample rate will illustrate that with too high of an input sample rate, the filter does not have sufficient time to complete an output calculation, and no PRBS pattern is output. By lowering the input sample rate again, until the PRBS pattern reappears, the maximum input sample rate can be determined for your evaluation board/oscillator combination. Note that a similar process can be used to determine the maximum input rate of each of the example filter files, taking care to enter the proper DS and IP values for each filter as noted in Appendix G - Descriptive File List.

/16. Varying the input

OSC

Generating User Conﬁgurations

Now that you understand the basics of controlling this modulator evaluation board, you should be able to edit the example conﬁguration and stimulus ﬁles to obtain the test ﬁguration you desire. Remember that it is best to begin with the ﬁles that most closely match the desired conﬁguration. Appendix G - Descriptive File List has a description of these ﬁles.

HSP50215EVAL

Detailed Circuit Description

The reader should reference the detailed schematics, found in Appendix E - Detailed Schematics, while reading the detailed circuit description.

Signal Path

Modulation Channel 4

Baseband in-phase and quadrature (I and Q) data enters the HSP50215EV AL via the host computer ISA interface (sheet

6), and is routed to an ACTEL® FPGA (U6 - U9) on one of the four upconv erter channels (sheets 1-4). Data enters the HSP50215 Digital UpConverter (U1, U2, U3, or U4) from the associated ACTEL® FPGA via busses C(15:0) and DUA(9:0), and the WR control line. The Digital Upconverter provides the primary DSP processing for each channel. The control software allows Modulation Channel 4 selection of the modulation type (QASK, bandlimited FM and shaped FM), Resampler frequency, IF frequency, gain control, as well as shaping and interpolation filter configuration. The output of the digital upconverter for modulation channel 4, U1, is routed to the cascade input of modulation channel 3 (sheet 2 - U2).

Modulation Channel 4 also allows for external digital cascade input, via connector J1. This input can be used for cascading several evaluation boards together, or for inclusion of any digitized IF signal, with the digital IF output of the modulation channel 4 upconverter, U1. The sync and clock signals are supplied to the connector from the clock and sync selection circuitry found on sheet 4 of the schematic.

JP1 and RZ1 provide control and selection for the channel 4 ACTEL® FPGA and associated Digital UpConverter. U13 and 14 provide the memory storage for data being processed by the ACTEL® FPGA.

Four modulation channels are provided, so that HSP50215 evaluation can include processing a signal of interest in the presence of two adjacent channel signals and an interferer signal.

Modulation Channel 3

Sheet 2 of the schematic details the control and access circuitry for modulation channel 3. U2 is the Digital upconverter and U7 is the associated ACTEL® FPGA.The control software allows Modulation Channel 2 selection of the modulation type (QASK, bandlimited FM and shaped FM), Resampler frequency, IF frequency, gain control, as well as shaping and interpolation ﬁlter conﬁguration.

JP2 and RZ2 provide control and selection for the channel 3 ACTEL® FPGA and associated Digital UpConverter. U15 and 16 provide the memory storage for data being processed by the ACTEL® FPGA.

Care must be taken to ensure that the cascade input summed with the modulation output of channel two do not limit inside

the digital upconverter for channel two. The gain control can be used to provide sufficient back off. The output of the digital upconverter for modulation channel 3, U2, is routed to the cascade input of modulation channel 2 (sheet 3 - U3).

Modulation Channel 2

Sheet 3 of the schematic details the control and access circuitry for Modulation Channel 2. U3 is the Digital upconverter and U8 is the associated ACTEL® FPGA. The control software allows Modulation channel 2 selection of the modulation type (QASK, bandlimited FM and shaped FM), Resampler frequency, IF frequency, gain control, as well as shaping and interpolation ﬁlter conﬁguration.

JP3 and RZ3 provide control and selection for the channel 2 ACTEL® FPGA and associated Digital UpConverter. U17 and 18 provide the memory storage for data being processed by the ACTEL® FPGA.

Care must be taken to ensure that the cascade input summed with the modulation output of channels 4 and 3 do not limit inside the digital upconverter for channel 2. The Gain control can be used to provide sufﬁcient back off. The output of the digital upconverter for modulation channel 2, U3, is routed to the cascade input of modulation channel 1 (sheet 4 - U4).

Modulation Channel 1

Sheet 4 of the schematic details the control and access circuitry for modulation channel 1. U4 is the Digital upconverter and U9 is the associated ACTEL® FPGA. The control software allows Modulation Channel 1 selection of the modulation type (QASK, bandlimited FM and shaped FM), Resampler frequency, IF frequency, gain control, as well as shaping and interpolation ﬁlter conﬁguration.

JP4 and RZ6 provide control and selection for the channel 1 ACTEL® FPGA and associated Digital Upconverter. U19 and 20 provide the memory storage for data being processed by the ACTEL® FPGA.

Care must be taken to ensure that the cascade input summed with the modulation output of channels 4 through 2 do not limit inside the digital upconverter for channel 1. The Gain control can be used to provide sufﬁcient back off. The output of the digital upconverter for modulation channel 1, U4, is routed to an output connector, J2, and to an DAC, U5, found on sheet 5. J2 is the digital output that is the cascaded IF outputs of channels 4 through 1. The DACoutput is routed to J5 and provides 50Ω output at 0.5Vpp.

Modulation Channel 1 also has an input connector, J3, which allows for direct control of one HSP50215 modulation channel on the HSP50215EVAL. Input Connector J4 provides access to the control bus of the ACTEL® FPGA for channel four.All other channels are expected to be not used, to prevent bus contention during the control of the channel 1 upconverter, via the channel 1 ACTEL® FPGA.

ACTEL® is a registered trademark of Actel Corporation.

HSP50215EVAL

PC/Controller Interface Section

ISA Interface

The normal installation conﬁguration of the HSP50215EVAL Card is in a PC, using a standard ISA slot. J10 on sheet 6 of the schematic details the card connector interface to the computer ISA bus. JP6 is used to set the card address location in the PC. The default card address shown on the schematic is 110000, and should be used unless that address has already been allocated in your PC conﬁguration. U21 and RZ7 perform the card decode from the ISA interface and combine with U22 and U23 to generate the Read, Write and Address handling necessary for proper ISA interaction with the HSP50215EVAL.

Jumper JP9 allows for ISA control interface or an 8-bit parallel port interface via connector J9. Set the jumper conﬁguration as shown in the schematic for ISA interface operation. U24 provides the ISA bus interface to the HSP50215EVAL 8-bit bus interface which downloads control data to the ACTEL® FPGA’s on each of the four modulator channels.

Parallel Interface Conﬁguration

To conﬁgure the HSP50215EVAL to operate from a parallel port interface, remove jumpers JP6 17-18, and remove jumpers 1-2 and 5-6 from JP9. Install jumpers 3-4 and 7-8 on JP9. (Connects the external data bus, write signal and the address signals to the appropriate labelled pins on the J9 connector). Depending on the length of the cable connected to J9, installation of R13 and 14 as well as C3 and 4 may be desirable to improve the signal quality of the WR and address signals.

Clocking

Jumpered Options

Sheet 4 of the schematic contains the jumpers for several clocking configurations. JP8 determines the source for the CONNINCLK, MASTERCLK, and DACCLK clock drivers, U11, on the board. When JP8 1-2 and 3-4 are installed, then the clock source will be either an external source or the on-board crystal oscillator and the connector clock is driven by the card. These jumpers also route the clock to the output connector, J2. When JP8-2-3 is installed, the output connector is the source of the clock. The configuration shown on the schematic is for internal cr ystal clock source.

JP7 determines if the clock source is external or internal. The default conﬁguration shown in the schematic is for operation from the internal crystal clock source, U10. Termination of the external clock with 50Ω is done by installing the JP10 jumper.

Jumper JP5 sets the source for the sync signal. Installing jumpers J5 7-8 and 9-10 route the SYNCOUT from Channel 1 to the CASSYNC2 location on J1 and to the SYNCIN of U1-4. Installing JP5 5-6 routes this sync signal to the output connector.

JP5 also allows jumpering of additional digital IF output resolution to the output connector, J2. Installing JP5 1-2 and 34 provides 2 bits of additional resolution on the output connector.

Power Supply Connections

The +5V and -12V are supplied via the ISA interface when the card is installed in a PC. When the card is used outside the PC, +5V is input via J8 and -12V is input via J7. The +5V can be supplied from any generic +5V adapter. The e valuation board draws approximately 1.5A at 52MHz on the 5V connector, J10 and is regulated to -5V with U12, shown on sheet 5 of the schematic. If the ISA bus interface is used, then jumper J11 must be installed. If an external -5V used, then jumper J11 must not be installed. Any generic 5V

/200mA AC/DC power adapter can be used for the J7

input. The evaluation board draws approximately 100mA

at 52MHz on the -5V

input. The -12V is supplied from the ISA

input.

/2A AC/DC power

supply is

Advanced Evaluation Conﬁgurations

Non ISA (PC installed) Operation

The HSP50215EV AL can be oper ated external to a PC for laboratory applications with other evaluation boards. The ISA interface is disabled by configuring jumpers on the board.

Remove jumpers JP9 1-2 and 5-6. Install jumpers JP9 3-4 and 7-8. Remove jumper JP6 17-18 and 19-20. Remove jumper JP-11 and provide external power supply

voltages -5.0V The ﬁgure at the end of Appendix B - Initial Jumper Settings

is a visual reference jumper conﬁguration for this conﬁguration.

The control processor must then be connected to the parallel interface on J9. PDC(7-0) is the data bus, PARWR is the Write signal and PARA is the Address signal. The installation of R13 and R14 as well as C3 and C4 may help reduce signal distortion for long cable interfaces. Once the parallel port connection is made, and the jumpers set, the board is ready for operation and control from the parallel interface rather than the ISAbus interface.

As in the ISAbus conﬁguration stimulus, and ﬁlter ﬁles are used to operate the board.

at J7 and +5.0VDC at J8.

HSP50215EVAL

Direct Modulator Control

The HSP50215EVAL Board provides a conﬁguration that allows a user direct access to the HSP50215 control busses as well as to the ACTEL® FPGA bus interface. This mode is intended for single channel only operation, as bus contention will result if other channels are attempted to be controlled via the parallel or ISA bus while the local control is active.

Modulation channel 1 is the channel that has connectors for the local control of the DUC and ACTEL®. J4 provides the HSP50215 interface and J3 provides the ACTEL® interface. The user must design a cable to match the appropriate data and control signals for these parts, if local control is to be effective.

Disable the ACTEL by removing JP4 9-10

Using SERINADE™ Designed Filters

SERINADE, a ﬁlter design tool can be used to synthesize a ﬁlter for the HSP50215 shaping ﬁlters. This procedure assumes that the SERINADE .imp ﬁles are available for import. Version 1.1 or higher is recommended.

File format is consistent with a SERINADE .imp ﬁle or SIGLAB™ ﬁle.

Appendix A - Circuit Board Layout

JP10

JP7JP8

JP11

U10

JP5

JP9

JP6

JP2 JP3 JP4

JP1

SERINADE™ is a trademark of Intersil Corporation.

SIGLAB™ a trademark of The Athena Group, Inc.

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