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CONTENTS
Chapter 1 Introduction ........................................................................................................................ 2
1.1 Features....................................................................................................................................................... 2
1.2 Getting Help ............................................................................................................................................... 3
Chapter 2 Architecture ........................................................................................................................ 4
2.1 Layout and Components ............................................................................................................................. 4
2.2 Block Diagram of the PCA Board .............................................................................................................. 5
Chapter 3 Board Components ............................................................................................................ 7
3.1 PCIe Edge Connector ................................................................................................................................. 7
3.2 PCIe Cable Connector ................................................................................................................................ 9
3.3 Switches .................................................................................................................................................... 12
3.4 LEDs ......................................................................................................................................................... 15
Chapter 4 Appendix ........................................................................................................................... 17
4.1 Revision History ....................................................................................................................................... 17
4.2 Copyright Statement ................................................................................................................................. 17
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Chapter 1
Introduction
The Terasic PCIe x4 Cable Adapter (PCA) is used to connect a PCIe upstream slot with downstream
target board via PCIe x4 cable, supporting PCIe x4 & x1 lanes. The PCA can provide
programmable equalization, amplification, and de-emphasis for PCIe transceiver signal by using 8
select bits. It is also available to optimize performance over a variety of physical mediums by
reducing Inter-symbol interference.
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Figure 1-1 shows a photograph of the PCA.
Figure 1-1 Exterior View
The key features of the card are listed below:
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• Up to 5.0Gbps PCIe 2.0 Serial Re-Driver
• PCIe x4 Gen 2
• Adjustable receiver equalization
• Adjustable transmitter amplitude and de-emphasis
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Here is information of how to get help if you encounter any problem:
Terasic Technologies
• Tel: +886-3-550-8800
• Email: support@terasic.com
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Chapter 2
Architecture
This chapter provides information about architecture and block diagram of the PCA board.
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The picture of the Terasic PCIe x4 Cable Adapter (PCA) is shown in Figure 2-1 and Figure 2-2. It
depicts the layout of the board and indicates the locations of the connectors and key components.
Figure 2-1 The PCA Card PCB and Component Diagram (top view)
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Figure 2-2 The PCA Card PCB and Component Diagram (bottom view)
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Figure 2-3 shows the block diagram of the PCA card.
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Figure 2-3 Block Diagram of PCA
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Chapter 3
Board Components
This chapter describes the specifications of the on board components.
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This PCIe edge connector is used to connect the PCA with PC motherboard PCIe slot, as show
Figure 3-1 and Figure 3-2.
Figure 3-1 PCA Edge Connector
Figure 3-2 Plug the PCA into the PCIe slot of the Motherboard
The pins are numbered as shown in Table 3-1 with side A on the top of the center-line on the solder
side of the board and side B on the bottom of the centerline on the component side of the board.
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The PCIe interface pins PETpx, PETnx, PERpx, and PERnx are named with the following
convention: “PE” stands for PCIe high speed, “T” for Transmitter, “R” for Receiver, “p” for
positive (+), and “n” for negative (-).
Note that adjacent differential pairs are separated by two ground pins to manage the connector
crosstalk.
Table 3-1 gives the wiring information of the PCIe Edge connector.
Table 3-1 Pin assignments and descriptions on PCIe Edge connector
Pin Numbers
Side B
Side A
Name
Description
Name
Description
1
NC
NC
PRSNT1n
Hot-Plug
presence detect
2
NC
NC
NC
NC 3 NC
NC
NC
NC 4 GND
Ground
GND
Ground
5
NC
NC
NC
NC 6 NC
NC
NC
NC 7 GND
Ground
NC
NC 8 VCC3P3
3.3V Power
NC
NC 9 NC
NC
VCC3P3
3.3V Power
10
3.3VAUX
3.3 V Auxiliary
Power
VCC3P3
3.3V Power
11
WAKE
NC
PERSTn
Fundamental
Reset
Mechanical Key
12
RSVD
Reserved
GND
Ground
13
GND
Ground
REFCLK+
Reference clock
(differential
pair)
14
PETp0
Transmitter
differential pair,
Lane 0
REFCLK15
PETn0
GND
Ground
16
GND
Ground
PERp0
Receiver
differential pair,
Lane 0
17
PRSNT2n
Hot-Plug
presence detect
PERn0
18
GND
Ground
GND
Ground
19
PETp1
Transmitter
differential pair,
Lane 1
20
PETn1
GND
Ground
21
GND
Ground
PERp1
Receiver
differential pair,
Lane 1
22
GND
Ground
PERn1
23
PETp2
Transmitter
differential pair,
GND
Ground
24
PETn2
GND
Ground
9
Lane 2
25
GND
Ground
PERp2
Receiver
differential pair,
Lane 2
26
GND
Ground
PERn2
27
PETp3
Transmitter
differential pair,
Lane 3
GND
Ground
28
PETn3
GND
Ground
29
GND
Ground
PERp3
Receiver
differential pair,
Lane 3
30
RSVD
Reserved
PERn3
31
PRSNT2n
Hot-Plug
presence detect
GND
Ground
32
GND
Ground
RSVD
Reserved
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A PCIe cable connector is used to connect the PCIe x4 Cable and PCA cable connector, Connect the
adapter by using a PCIe x4 Cable, as show Figure 3-3.
Figure 3-3 PCIe x4 Cable and PCA
To purchase the PCIe x4 Cable, please refer the url: PCIe_Cable.terasic.com.
Figure 3-4 as show the PCIe Cable connects PCA connector
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Figure 3-4 PCIe Cable and PCA connector Connected
Table 3-2 gives the wiring information of the PCIe Cable connector.
Pin Numbers
Name
Description
A1
GND
Ground reference for PCI
Express transmitter Lanes
A2
PETp0
Differential PCI Express
transmitter Lane 0
A3
PETn0
Differential PCI Express
transmitter Lane 0
A4
GND
Ground reference for PCI
Express transmitter Lanes
A5
PETp1
Differential PCI Express
transmitter Lane 1
A6
PETn1
Differential PCI Express
transmitter Lane 1
A7
GND
Ground reference for PCI
Express transmitter Lanes
A8
PETp2
Differential PCI Express
transmitter Lane 2
A9
PETn2
Differential PCI Express
transmitter Lane 2
A10
GND
Ground reference for PCI
Express transmitter Lanes
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A11
PETp3
Differential PCI Express
transmitter Lane 3
A12
PETn3
Differential PCI Express
transmitter Lane 3
A13
GND
Ground reference for PCI
Express transmitter Lanes
A14
CREFCLK+
Differential 100MHz cable
reference clock
A15
CREFCLK-
Differential 100MHz cable
reference clock
A16
GND
Ground reference for PCI
Express transmitter Lanes
A17
SB_RTN
Signal return for single ended
sideband signals
A18
CPRSNTn
Used for detection of whether
a cable is installed and the
downstream subsystem is
powered
A19
CPWRON
Turns power on / off to slavetype
downstream subsystems
B1
GND
Ground reference for PCI
Express transmitter Lanes
B2
PERp0
Differential PCI Express
receiver Lane 0
B3
PERn0
Differential PCI Express
receiver Lane 0
B4
GND
Ground reference for PCI
Express transmitter Lanes
B5
PERp1
Differential PCI Express
receiver Lane 1
B6
PERn1
Differential PCI Express
receiver Lane 1
B7
GND
Ground reference for PCI
Express transmitter Lanes
B8
PERp2
Differential PCI Express
receiver Lane 2
B9
PERn2
Differential PCI Express
receiver Lane 2
B10
GND
Ground reference for PCI
Express transmitter Lanes
B11
PERp3
Differential PCI Express
receiver Lane 3
B12
PERn3
Differential PCI Express
receiver Lane 3
B13
GND
Ground reference for PCI
Express transmitter Lanes
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B14
PWR
+3.3VCable power
B15
PWR
+3.3VCable power
B16
PWR RTN
Cable power return
B17
PWR RTN
Cable power return
B18
CWAKEn
Power management signal for
wakeup events (optional)
B19
CPERSTn
Cable PERSTn
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The PCA contains x2 and x8 switches that allow configuration of the PCA PCIe mode (SW1),
equalization and de-emphasis (SW2). The two switches, SW1 and SW2, are located on top of the
front side of the PCA card. Figure 3-5 show the location of the board.
Figure 3-5 Switches
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Figure 3-6 show the SW1 settings
Table 3-3 SW1 Settings
Pin 2
Pin 1
PCIe Mode (x1/x4)
UP
UP
NULL
UP
Down
x1
Down
UP
x4(Default mode)
Down
Down
NULL
Figure 3-7 Show the SW2 Settings
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The PI2EQX5904 chip located on the PCA has two channels, A and B, which are separately
equalization controlled. Figure 3-8 shows the block diagram of the channel A and B. Table 3-4 &
Table 3-5 list the SW2 pins settings on Equalizer Configuration for channel A or channel B.
Figure 3-8 CH_A and CH_B of PI2EQX5904
Table 3-4 SW2 Settings (Input Equalizer Configuration for Channel A)
Pin 1 SEL0_A
Pin 2 SEL1_A
Pin 3 SEL2_A
@1.25GHz
@2.5GHz
0 0 0
0.5dB
1.2 dB
0 0 1
0.6dB
1.5 dB
0 1 0
1.0 dB
2.6 dB
0 1 1
1.9 dB
4.3 dB
1 0 0
2.8 dB
5.8 dB
1 0 1
3.6 dB
7.1 dB
1 1 0
5.0 dB
9.0 dB
1 1 1
7.7 dB(Default Setting)
12.3 dB(Default Setting)
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Table 3-5 SW2 Settings (Input Equalizer Configuration for Channel B)
Pin 4 SEL0_B
Pin 5 SEL1_B
Pin 6 SEL2_B
@1.25GHz
@2.5GHz
0 0 0
0.5dB
1.2 dB
0 0 1
0.6dB
1.5 dB
0 1 0
1.0 dB
2.6 dB
0 1 1
1.9 dB
4.3 dB
1 0 0
2.8 dB
5.8 dB
1 0 1
3.6 dB
7.1 dB
1 1 0
5.0 dB
9.0 dB
1 1 1
7.7 dB(Default Setting)
12.3 dB(Default Setting)
The SW2 pin 7 connects to the PI2EQX5904 RXD_A pin, while SW2 pin 8 connects to
PI2EQX5904 RXD_B pin. These 2 pins are used to control channel A & B Receiver Detect Enable
function. Automatic Receiver Detection is a feature that can set the number of active channels. By
sensing the presence of a load device on the output, the channel can be automatically enabled to
operate.
When setting the RXD_A or RXD_B to a high level, Automatic Receiver Detection will be enabled.
Please refer the datasheet of PI2EQX5904 for more settings.
Table 3-6 SW2 Settings (Receiver Detect Function Enable for CH_A & CH_B)
Pin 7 RXD_A
Pin 8 RXD_B
Receiver Detect Function Enable
1 1 CH_A & CH_B Receiver Detect
Enable (Default Setting)
1 0 CH_A Receiver Detect Enable
CH_B Receiver Detect Disable
0 1 CH_A Receiver Detect Disable
CH_B Receiver Detect Enable
0 0 CH_A & CH_B Receiver Detect
Disable
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The PCA includes status LEDs, Please refer Table 3-7 for the status of the LED indicator.
Board
Reference
LED name
Description
D1
CBL
Cable PRSNT1n
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D2
EDGE
Edge PRSNT1n
D3
POWER
Power LED
DN1
SIG_A
Signal detect output for CH_A
DN2
SIG_B
Signal detect output for CH_B
DN3
RX50_A
Receiver Detect Output for CH_A0
DN4
RX50_B
Receiver Detect Output for CH_B0
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Chapter 4 Appendix
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Version
Change Log
V1.0
Initial Version (Preliminary)
V1.1
Delete the chapter of TR4 demo
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Copyright © 2012 Terasic Technologies. All rights reserved.
Mouser Electronics
Authorized Distributor
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