Philips SAA4952W Service Manual

INTEGRATED CIRCUITS

DATA SH EET

SAA4952WP

Memory controller

Objective speciﬁcation File under Integrated Circuits, IC02

1997 Jun 10

Philips Semiconductors Objective speciﬁcation

Memory controller SAA4952WP

FEATURES

• Support for acquisition, display and deflection PLL

• 50/100 Hz (or 60/120 Hz) scan conversion

• Progressive scan 50 Hz/1250 lines (60 Hz/1050 lines)

interlaced or 50 Hz/625 lines (60 Hz/525 lines) non-interlaced in serial memory structure

• 50 Hz/625 lines (60 Hz/525 lines) mode support for a PALplus system and basic features

• Acquisition frequencies 12, 13.5, 16 and 18 MHz and display frequencies of 27, 32 and 36 MHz (2fH) in every combination, horizontal compression (support for 4 : 3 and 14 : 9 display on a 16 : 9 screen) and horizontal zoom

• Configured as a three clock system with a fixed 27 MHz deflection clock (deflection controlled by the TDA9151)

• Configured as a two-clock system (deflection controlled by e.g. TDA9152)

• Single clock for 50 Hz vertical and 15.625 kHz horizontal frequency

• Support of new IC generations [PAN-IC (SAA4995WP), VERIC (SAA4997H), MACPACIC (SAA4996H) and LIMERIC (SAA4945H)]

• Support for two or one field memories

• Still picture

• Support for memory types such as TMS4C2970/71

• Internal simple Multi-PIP (3 × 3) or (4 × 4) conversion

• Multi-PIP support with an external PIP module/full

performance

• Programmable via microcontroller port

• Capability of reading the length of incoming fields via

microcontroller port

• Golden SCART option (clock generation for TDA9151)

• Acquisition is able to operate with external sync and

clock of digital sources (slave mode)

• Generator mode for the display, stable still picture or OSD in the event of no input source.

GENERAL DESCRIPTION

The memory controller SAA4952WP is the improved version of the SAA4951WP. The circuit has been designed for high-end TV sets using 2f

technics. For basic feature

modules a 1fH mode can be activated. In this situation the controller supplies the system with a line-locked clock. The new device has been designed to be able to operate in the hardware environment of the SAA4951WP.

The circuit provides all necessary write, read and clock pulses to control different field memory concepts. Furthermore the drive signals for the horizontal and vertical deflection power stages are also generated.

The device is connected to a microcontroller via an 8-bit data bus. The microcontroller receives commands via the I2C-bus. Due to this fact the START and STOP conditions of the main output control signals are programmable and the SAA4952WP can be set in different function modes depending on the TV feature concept that is used.

QUICK REFERENCE DATA

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

LLDFL,LLD

acq

amb

supply voltage 4.5 5 5.5 V supply current − 35 − mA operating frequency of display and deﬂection part −−33 MHz acquisition frequency −−37 MHz operating ambient temperature 0 − 85 °C

ORDERING INFORMATION

PACKAGE

TYPE NUMBER

NAME DESCRIPTION VERSION

SAA4952WP PLCC44

plastic leaded chip carrier; 44 leads

SOT187-2

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Philips Semiconductors Objective speciﬁcation

Memory controller SAA4952WP

BLOCK DIAGRAM

ALE

handbook, full pagewidth

WRD P0 P1 P2

21 22 25 26 27 28 29 30 31 32

P3 P4 P5 P6 P7

STROBE

LLA

(12, 13.5, 16, 18 MHz)

TEST

SDP SSC

VACQ

(50/60 Hz)

LLDFL

(27, 32, 36 MHz)

LLD

(32, 36 MHz)

MICROCONTROLLER

INTERFACE

40 5 41

DEFLECTION

TIMING

LOGIC

ACQUISITION HORIZONTAL

TIMING

VACQS

ACQUISITION

VERTICAL

TIMING

DISPLAY

VERTICAL

TIMING

DISPLAY

HORIZONTAL

TIMING

2, 10, 23, 36

SAA4952WP

PROCESSING

HWE1

VWE1

VWE2 VRE1 VRE2

HWE2 HRE

12, 24, 34, 44

÷ 2

LOGIC

35 37

3 6

IE1 IE2

SWC1 SWC05 HRA/BLNA

CLV

WE1

RSTW1

HRDFL HDFL

VDFL

WE2

HVCD

RE1

RE2

BLND HRD

SRC

DD1

Fig.1 Block diagram.

1997 Jun 10 3

to V

DD4

SS1

to V

SS4

MHA724

Philips Semiconductors Objective speciﬁcation

Memory controller SAA4952WP

PINNING

SYMBOL PIN I/O DESCRIPTION

HRD 1 O horizontal reference signal output (display PLL) V

DD1

SWC1 3 O serial write clock output for memory 1 SRC 4 O serial read clock output SDP 5 I select deﬂection processor input SWC05 6 O serial write clock output, SWC1 divided-by-2 IE1 7 O input enable signal output (memory 1) WE1 8 O write enable signal output (memory 1) STROBE 9 I strobe signal input V

DD2

HRA/BLNA 11 I/O horizontal reference signal output (acquisition part)/horizontal blanking

SS1

LLA 13 I line-locked clock signal input (acquisition part) IE2 14 O input enable signal output (memory 2) WE2 15 O write enable signal output (memory 2) CLV 16 O horizontal signal output (acquisition part) HVCD 17 O horizontal, vertical or composite blanking signal output (display part) RE1 18 O read enable signal output (memory 1) RE2 19 O read enable signal output (memory 2) BLND 20 O horizontal blanking signal output (display part) ALE 21 I address latch enable signal input WRD 22 I write/read data signal input V

DD3

SS2

P0 25 I/O data input/output signal bit 0 P1 26 I/O data input/output signal bit 1 P2 27 I/O data input/output signal bit 2 P3 28 I/O data input/output signal bit 3 P4 29 I/O data input/output signal bit 4 P5 30 I/O data input/output signal bit 5 P6 31 I/O data input/output signal bit 6 P7 32 I/O data input/output signal bit 7 (MSB = Most Signiﬁcant Bit) LLDFL 33 I line-locked clock signal input (deﬂection part) V

SS3

HRDFL 35 O horizontal reference signal output (deﬂection part) V

DD4

HDFL 37 O horizontal synchronization signal output (deﬂection part) VDFL 38 O vertical synchronization signal output (deﬂection part) VACQ 39 I vertical synchronization signal input (acquisition part)

2 supply supply voltage 1

10 supply supply voltage 2

signal input, reset for horizontal acquisition counters (acquisition part)

12 − ground 1

23 supply supply voltage 3 24 − ground 2

34 − ground 3

36 supply supply voltage 4

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Philips Semiconductors Objective speciﬁcation

Memory controller SAA4952WP

SYMBOL PIN I/O DESCRIPTION

TEST 40 I test input SSC 41 I select single clock system input RSTW1 42 O reset write signal output (memory 1) LLD 43 I line-locked clock signal input (display part) V

SS4

44 − ground 4

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IE1

WE1

STROBE

DD2

HRA/BLNA

SS1

LLA

IE2

WE2

CLV

HVCD

SS4

SDP 5

RE2

SWC1

SRC

SAA4952WP

ALE

BLND

V 2

WRD

SWC05

7 8

9 10 11 12 13 14 15 16 17

RE1

DD1

HRD 1

DD3

V 44

SS2

LLD 43

RSTW1

SSC

26 P1

TEST 40

28 P3

39 38 37 36 35 34 33 32 31 30 29

MHA723

VACQ VDFL HDFL V

DD4

HRDFL V

SS3

LLDFL P7 P6 P5 P4

Fig.2 Pin configuration.

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Philips Semiconductors Objective speciﬁcation

Memory controller SAA4952WP

FUNCTIONAL DESCRIPTION

The SAA4952WP is a memory controller intended to be used for scan conversion in TV receivers. This conversion is performed from 50 to 100 Hz or from 60 to 120 Hz. Besides the doubling of the field frequency a progressive scan conversion can be activated (50 Hz/1250 lines or 60 Hz/1050 lines). For low cost PALplus receivers a simple 50 Hz/1fH mode can be performed. The device supports up to three separate PLL circuits. The acquisition PLL can operate with frequencies of 12, 13.5, 16 or 18 MHz. In a three-clock system the deflection PLL operates with 27 MHz (see Fig.11). An additional display PLL generates 32 or 36 MHz. If a two-clock system is chosen the deflection PLL can operate with all possible display frequencies (27, 32 and 36 MHz) and the extra PLL can be omitted (see Fig.12). In a system using the deflection processor TDA9151, three PLLs are necessary because the 27 MHz clock is needed for the deflection. If other deflection processors are used (e.g. TDA9152) two PLLs are sufficient. The 50 Hz/1f single clock.

Frequency doubling is possible for input data rates of 12, 13.5, 16 and 18 MHz. Displaying a 4 : 3 picture on a 16 : 9 screen is possible by using the clock configuration 12/32 MHz and 13.5/36 MHz. A 14 : 9 picture can be displayed on a 16 : 9 screen by the frequency combinations 16/36 MHz or 12/32 MHz. The VCO and loop filter are peripheral parts of each PLL, the clock divider and generation of the reference pulse for the phase detector are internally provided.

The device generates all write, read and clock pulses to control a field memory in the desired mode. The required signals are programmable via an 8-bit parallel microcontroller port.

Figure 1 shows the block diagram of the SAA4952WP. The clock signal LLA from the VCO is input at pin 13, a horizontal reference pulse HRA for the phase discriminator is output at pin 11. By setting the clock divider to different values the PLL can be forced to operate with different clock frequencies. The acquisition part can also be configured to operate with an external clock frequency from a digital source. Pin 11 is used as an input pin. The horizontal reference pulse BLNA is supplied externally to reset the horizontal counters. This mode is intended to be used together with, for example, a digital colour decoder which provides the clock and reference pulses.

The signals HWE1, CLV and HVACQS are generated in the horizontal acquisition processing part. The vertical processing block supplies the signals RSTW1 as well as a vertical enable signal (VWE1) for the combined write

mode operates with a

enable signal with a horizontal and vertical part (WE1). The START and STOP position of the pulses are programmable, whereas the increment equals 2 (4) clock cycles in the horizontal part and 1 line in the vertical part. For HWE1 an additional 2-bit fine delay is available.

Display related control signals are derived from the display clock. The functions are similar to the acquisition part. The clock frequency can be switched to 27, 32 or 36 MHz. In the event of a three-clock system using the TDA9151 the 27 MHz clock frequency is generated by an additional deflection PLL. In the horizontal part the pulses HWE2, HR2, HD and BLND are programmable in increments of 2 (4) clock cycles, each one adjustable by an additional 2-bit fine delay. The vertical processing block generates VDFL and enable signals for the horizontal part (VWE2, VRE1, VRE2 and VD).

The 16 kHz PLL reference pulse HRDFL is generated from the display clock frequencies (27, 32 or 36 MHz) and the 32 kHz deflection pulse HDFL. In the three-clock system the deflection pulses are derived from an extra 27 MHz clock, independent of the chosen mode of the scan converter module.

The field length of two successive fields is measured in the vertical acquisition part. The sampling of VACQ is performed internally via the signal HVACQS, a pulse which occurs every 32 µs. The position of this pulse is programmable via the microcontroller interface to ensure correct sampling of VACQ.

The measured length of the fields can be read by the microcontroller. Depending on these values the microcontroller selects an appropriate setting to achieve an optimized display performance.

The 100 Hz vertical synchronizing signal VDFL is generated in accordance with the measured length of the incoming fields. The position towards the video data of this pulse can also be selected by the microcontroller. Furthermore two field identification signals for 50 Hz and for 100 Hz are generated internally to mark the corresponding display fields for the microcontroller.

The SAA4952WP supports two different Multi Picture-In-Picture (MPIP) modes. In addition to the features of the SAA4951WP the new controller is able to generate a 3 × 3 MPIP without an external PIP module. The PIP is obtained in a simple way by storing each third pixel and line of the source into the memory. The display is able to run free and is not synchronized to the PIP source in this mode. One of the nine MPIPs can show a live picture while the others are frozen.

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Philips Semiconductors Objective speciﬁcation

Memory controller SAA4952WP

By changing the active MPIP in a sequence all PIPs are sequentially updated.

The second Multi-PIP option needs an extra PIP module. This module produces a PIP picture which is originally displayed at the bottom right position of the screen. The information of the PIP picture is stored at a desired position in the field memories. Depending on the compression mode of the PIP module, the MPIP display can be configured via software control (e.g. 4 × 3, 4 × 4, etc.).

For basic features and PALplus systems a 50 Hz/1f single clock mode is provided. Switching between a 2f

and the 1fH mode is performed by the SAA4952WP hardware pin SHF to avoid wrong HDFL frequencies which might occur in the event of a software controlled selection. For the same reason the deflection processor is selected via pin SDP, whereas in the case of the TDA9152 or another deflection processor without the need of a constant 27 MHz clock, only two PLLs are necessary.

ICs from the new IC generation such as PALplus, LIMERIC and PAN-IC need to be supplied with two clocks. The frequency of one clock equals the frequency of the output data (13.5, 16 or 18 MHz). A second clock operates with twice the frequency (27, 32 or 36 MHz). The SAA4952WP generates the necessary signals, whereas SWC05 is obtained by dividing LLA by a factor of two.

The display section can be set into a fixed mode via the microcontroller port. This allows a generator mode function for displaying OSD without a stable input signal. A still picture can be shown on the screen completely decoupled from the input of the converter. The generator mode can also be used if the MPIP function is activated.

Microcontroller interface

The SAA4952WP is connected to a microcontroller via pins P0 to P7, ALE and WRD. This controller receives commands from the I

C-bus and sets the register of the SAA4952WP accordingly. Figure 3 shows the timing of these signals. Address and data are transmitted sequentially on the bus with the falling edge of ALE denoting a valid address and the falling edge of WRD denoting valid data. The individual registers, their address and their function are listed in Tables 1 to 12. Various START and STOP registers are 9 bits wide, in this instance the MSB is combined with MSBs of other signals or fine delay control bits in an extra control register which has to be addressed and loaded separately.

In order to load the proper values to the vertical control registers (VWE2, VRE1 and VRE2) in the event of e.g. median filtering, information about the current 100 Hz field is necessary. To obtain this data, the microcontroller sends the address 80H (read mode) which puts the SAA4952WP in output mode for the next address/data cycle. For this one cycle the WRD pin works as a RDN pin.

The microcontroller is able to read the length of the incoming fields. The length is measured in multiples of 32 µs. The result of the measurement is a 10-bit data word. The first 8 bits can be accessed under read address 81H. Register 80H contains the MSB and the 9th bit. The exact knowledge of the field length makes it possible to decide in which standard the input signal was transmitted. The microcontroller is able to detect non-standard sources such as a VCR in trick modes. It is also possible to decide whether the input is interlaced or non-interlaced. The vertical control signals to the memories are adapted to the source to obtain a stable display.

handbook, full pagewidth

ALE

WRD

DATA

ADDRESS

DATA

ADDRESS

Fig.3 Microcontroller interface timing.

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DATA

ADDRESS

MGH133

Philips Semiconductors Objective speciﬁcation

Memory controller SAA4952WP

Internal registers Table 1 Vertical display related pulses

ADDRESS

(HEX)

40 VDFLSTA 41 VDFLSTO 42 VWE2STA 43 VWE2STO 44 VRE2STA 45 VRE2STO 46 VRE1STA 47 VRE1STO 53 VDSTA 54 VDSTO 55 VDMSB

62 SETFIELD1

63 SETFIELD2

(1)

start of VDFL pulse (only 8-bit)

(1)

stop of VDFL pulse (only 8-bit)

(2)

start of vertical write enable 2 (lower 8 of 9 bits)

(2)

stop of vertical write enable 2 (lower 8 of 9 bits)

(2)

start of vertical read enable 2 (lower 8 of 9 bits)

(2)

stop of vertical read enable 2 (lower 8 of 9 bits)

(2)

start of vertical read enable 1 (lower 8 of 9 bits)

(2)

stop of vertical read enable 1 (lower 8 of 9 bits)

(2)

start of vertical display signal (lower 8 of 9 bits)

(2)

stop of vertical display signal (lower 8 of 9 bits)

(2)

bit 0: MSB of VRE1STA bit 1: MSB of VRE1STO bit 2: MSB of VWE2STA bit 3: MSB of VWE2STO bit 4: MSB of VRE2STA bit 5: MSB of VRE2STO bit 6: MSB of VDSTA bit 7: MSB of VDSTO

(1)

ﬁeld length to be set by the microcontroller in the generator mode (lower 8 of 10 bits); bit 0 = LSB

(1)

ﬁeld length to be set by the microcontroller in the generator mode;

bit 0: bit 8 of ﬁeld length bit 1: bit 9 of ﬁeld length (MSB)

Notes

1. VDFLSTA, VDFLSTO, SETFIELD1 and SETFIELD2 are programmable in increments of half lines (16 µs/32 µs).

2. The memory control signals VWE2, VRE1 and VRE2 as well as VD can be changed in steps of one display line.

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Philips Semiconductors Objective speciﬁcation

Memory controller SAA4952WP

Table 2 Horizontal display related pulses

ADDRESS

(HEX)

48 BLNDSTA start of horizontal blanking pulse (lower 8 of 9 bits) 49 BLNDSTO stop of horizontal blanking pulse (lower 8 of 9 bits) 4A HWE2STA start of horizontal write enable 2 (lower 8 of 9 bits)

4B HWE2STO stop of horizontal write enable 2 (lower 8 of 9 bits) 4C HRESTA start of horizontal read enable (lower 8 of 9 bits) 4D HRESTO stop of horizontal read enable (lower 8 of 9 bits)

56 HDSTA start of horizontal display signal HD (lower 8 of 9 bits)

57 HDSTO stop of horizontal display signal HD (lower 8 of 9 bits) 4E HDMSB bit 0: MSB of BLNDSTA

4F HDDEL bit 0: ﬁne delay of BLND (LSB)

64 HVSP1 horizontal pulse 1 for frame synchronization, 8-bit resolution

65 HVSP2 horizontal pulse 2 for frame synchronization, 8-bit resolution

66 HVSP3 horizontal pulse 3 for frame synchronization, 8-bit resolution

67 HVSP4 horizontal pulse 4 for frame synchronization, 8-bit resolution

bit 1: MSB of BLNDSTO bit 2: MSB of HWE2STA bit 3: MSB of HWE2STO bit 4: MSB of HRESTA bit 5: MSB of HRESTO bit 6: MSB of HDSTA bit 7: MSB of HDSTO

bit 1: ﬁne delay of BLND (MSB) bit 2: ﬁne delay of HWE2 (LSB) bit 3: ﬁne delay of HWE2 (MSB) bit 4: ﬁne delay of HRE (LSB) bit 5: ﬁne delay of HRE (MSB) bit 6: ﬁne delay of HD (LSB) bit 7: ﬁne delay of HD (MSB)

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Philips Semiconductors Objective speciﬁcation

Memory controller SAA4952WP

Table 3 Vertical acquisition related pulses

ADDRESS

(HEX)

50 VWE1STA

51 VWE1STO

52 VAMSB bit 0: MSB of VWE1STA

(1)

start of vertical write enable (lower 8 of 9 bits)

(1)

stop of vertical write enable (lower 8 of 9 bits)

bit 1: MSB of VWE1STO bit 2:

BRE = 0: normal operation BRE = 1: RE output is blanking every second line in program scan mode

bit 3:

BWE = 0: normal operation BWE = 1: WE2 output is blanking every second line in program scan mode

bit 4: BPRR: Blanking Phase Relation RE for program

BPRR = 0: AND connection HRDFL and HRE BPRR = 1: AND connection HRDFLN and HRE

bit 5: BPRW: Blanking Phase Relation WE2 for program

BPRW = 0: AND connection HRDFL and HWE2 BPRW = 1: AND connection HRDFLN and HWE2

bit 6: BVRA: Blanking Vertical Reset Acquisition

BVRA = 0: reset blanking disabled BVRA = 1: reset blanking enabled

bit 7: BVRD: Blanking Vertical Reset Display

BVRD = 0: reset blanking disabled BVRD = 1: reset blanking enabled

Note

1. VWE1 programmable in steps of 1 line (64 µs).

1997 Jun 10 10

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