Philips SAA5700GP-M4C, SAA5700GP-M4B Datasheet

DATA SH EET

Preliminary specification
File under Integrated Circuits, IC02

1997 May 16

INTEGRATED CIRCUITS

SAA5700

Chinese Character System Teletext
(CCST) decoder

1997 May 16 2

Philips Semiconductors Preliminary specification

Chinese Character System Teletext
(CCST) decoder

SAA5700

FEATURES

• Acquisition and display of the 625-line PAL CCST
Chinese standard for teletext, with Chinese and Latin
character sets

• Supports multiple DRAM sizes: 256K × 4 bits,
1M × 4 bits, 4M × 4 bits and 2 × 1M × 4 bits with an
additional decoder/demultiplexer IC

• Acquires and stores in background up to (typically)
400 pages with 1M × 4 bits external DRAM

• CCST Fastext, with capability of displaying Chinese
characters on Fastext prompt row

• Meshing for reduced contrast video background in
subtitles and boxes

• Full line and screen colour to all edges of screen

• Supports 625-line 50/100 Hz display modes

• Scan-locked and stand-alone sync modes; supports

video-locked sync modes with external PLL

• Easy control via high level I

2

C-bus SAFARI commands

• Sync mode switching and picture centring via I2C-bus
SAFARI commands

• Supports external decryption unit for encrypted data.

GENERAL DESCRIPTION

The SAA5700 is a Chinese teletext decoder suitable for TV
and multimedia applications. It incorporates all the data
slicing, acquisition and display circuitry on-chip, as well as
the logic for memory management. An external DRAM is
used to store the currently displayed page and also the
precaptured teletext pages.

An external ROM is used to store the ideographic Chinese
character set. There is a high level software interface with
easy commands for the control of the decoder. Control is
achieved via the I2C-bus.

The device is available in a QFP64 package.

ORDERING INFORMATION

TYPE NUMBER

PACKAGE

NAME DESCRIPTION VERSION

SAA5700GP QFP64 plastic quad flat package; 64 leads (lead length 1.95 mm);

body 14 × 20 × 2.8 mm

SOT319-2

1997 May 16 3

Philips Semiconductors Preliminary specification

Chinese Character System Teletext
(CCST) decoder

SAA5700

BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

MGG539

SYNC

SEPARATOR

DATA

ACQUISITION

PACKET
BUFFER

MEMORY

INTERFACE

OSCILLATOR

AND CLOCK

GENERATOR

ACQUISITION

TIMING

PROCESSOR

BLOCK

DISPLAY

INTERFACE

DISPLAY

TIMING

FRONT END

DISPLAY SECTION

SAA5700

BUS

35

4

5

10
6

7

27
42
53
44

54, 41, 40,
38 to 36,
32 to 28

55 to 58,
52, 51,
47, 46

25

18

17

24

23

22

21

62

61

60

63

59

64

1

33 48 49 2 19 20 9 8 14,16,

26

12 MHz

RD7 to RD0

RA10 to RA0

WE

CAS

RAS

ROMCS

I

REF

REF+

STN

CVBS

BLACK

V

DDD1VSS1VDDD2VSS2VSS3VDDXVSSOVDDAVSSAVSS

OSCOUT
OSCIN

RESET

DCL
DDA
SCL
SDA

R
G
B
BLAN

LFB
FFB/STTV
ODD/EVEN

24 MHz

6 MHz

1997 May 16 4

Philips Semiconductors Preliminary specification

Chinese Character System Teletext
(CCST) decoder

SAA5700

PINNING

SYMBOL PIN I/O DESCRIPTION

OSCOUT 1 O oscillator output to crystal
V

SS3

2 ground ground for I/O pad buffers connect to VSS; internally connected to V

SS1

and V

SS2

n.c. 3 − not connected
BLACK 4 I/O black level sample and hold capacitor; 100 nF to V

SSA

CVBS 5 I video signal input; 100 nF series capacitor, 250Ω source impedance maximum,

reference to V

SSA

STN 6 I/O ADC current reference decoupling; 100 nF to V

SSA

I

REF

7 I current reference input; 10 kΩ to V

SSA

V

SSA

8 ground 0 V power supply; analog

V

DDA

9 supply +5 V power supply; analog

REF+ 10 I ADC voltage reference decoupling; 100 nF to V

SSA

i.c. 11 − internally connected; do not use
i.c. 12 − internally connected; do not use
i.c. 13 − internally connected; do not use
V

SS

14 ground connect to VSS for normal use
n.c. 15 − not connected
V

SS

16 ground connect to VSS for normal use
LFB 17 I scan line flyback input (HSYNC)
FFB/STTV 18 I/O scan field flyback input (VSYNC)/sync to TV output
V

DDX

19 supply +5 V power supply; connect to VDD for normal use
V

SSO

20 ground output stage current return and 0 V
R 21 O analog Red output
G 22 O analog Green output
B 23 O analog Blue output
BLAN 24 O fast blanking (VDS)
ODD/EVEN 25 O frame rate signal for hardware de-interlace (FRAME)
V

SS

26 ground connect to VSS for normal use
ROMCS 27 O chip select (address decode) for ROM
RA0 28 O bit 0 of address to DRAM, ROM and IC
RA1 29 O bit 1 of address to DRAM, ROM and IC
RA2 30 O bit 2 of address to DRAM, ROM and IC
RA3 31 O bit 3 of address to DRAM, ROM and IC

1997 May 16 5

Philips Semiconductors Preliminary specification

Chinese Character System Teletext
(CCST) decoder

SAA5700

RA4 32 O bit 4 of address to DRAM, ROM and IC
V

SS1

33 ground 0 V power supply digital; connected internally to V

SS2

and V

SS3

n.c. 34 − not connected
V

DDD1

35 supply +5 V power supply digital; connected internally to V

DD2

RA5 36 O bit 5 of address to DRAM, ROM and IC
RA6 37 O bit 6 of address to DRAM, ROM and IC
RA7 38 O bit 7 of address to DRAM, ROM and IC
n.c. 39 − not connected
RA8 40 O bit 8 of address to DRAM, ROM and IC
RA9 41 O bit 9 of address to DRAM, ROM and IC
RAS 42 O row address strobe to DRAM; active LOW
n.c. 43 − not connected
WE 44 O write enable to DRAM and IC; active LOW
i.c. 45 − internally connected; do not use
RD0 46 I/O bit 0 of data bus to/from DRAM, ROM and IC
RD1 47 I/O bit 1 of data bus to/from DRAM, ROM and IC
V

DDD2

48 supply +5 V power supply digital; connected internally to V

DD1

V

SS2

49 ground 0 V power supply digital; connected internally to V

SS1

and V

SS3

n.c. 50 − not connected
RD2 51 I/O bit 2 of data bus to/from DRAM, ROM and IC
RD3 52 I/O bit 3 of data bus to/from DRAM, ROM and IC
CAS 53 O column address strobe to DRAM; active LOW
RA10 54 O bit 10 of address to DRAM, ROM and IC
RD7 55 I/O bit 7 of data bus to/from DRAM, ROM and IC
RD6 56 I/O bit 6 of data bus to/from DRAM, ROM and IC
RD5 57 I/O bit 5 of data bus to/from DRAM, ROM and IC
RD4 58 I/O bit 4 of data bus to/from DRAM, ROM and IC
RESET 59 I chip/processor reset input (active HIGH)
DDA 60 I/O bidirectional serial data to/from optional Decryptor
SCL 61 I primary I

2

C-bus serial clock input

SDA 62 I/O primary I

2

C-bus serial data
DCL 63 O serial clock to optional Decryptor
OSCIN 64 I oscillator input from crystal/external clock input

SYMBOL PIN I/O DESCRIPTION

1997 May 16 6

Philips Semiconductors Preliminary specification

Chinese Character System Teletext
(CCST) decoder

SAA5700

Fig.2 Pin configuration.

handbook, full pagewidth

SAA5700

MGG538

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19

OSCOUT

V

SS3

n.c.

BLACK

CVBS

STN

I

REF

V

SSA

V

DDA

REF+

i.c.
i.c.
i.c.

V

SS

n.c.

V

SS

LFB

FFB/STTV

V

DDX

RD2
n.c.
V

SS2

V

DDD2

RD1
RD0
i.c.
WE
n.c.
RAS
RA9
RA8
n.c.
RA7
RA6
RA5
V

DDD1
n.c.
V

SS1

51

50
49
48
47
46
45
44
43
42

41
40
39
38
37
36
35
34
33

20

21

22

23

24

25

26

27

28

29

30

31

32

64

63

62

61

60

59

58

57

56

55

54

53

52

OSCIN

DCL

SDA

SCL

DDA

RESET

RD4

RD5

RD6

RD7

RA10

CAS

RD3

V

SSO

R

G

B

BLAN

ODD/EVEN

V

SS

ROMCS

RA0

RA1

RA2

RA3

RA4

1997 May 16 7

Philips Semiconductors Preliminary specification

Chinese Character System Teletext
(CCST) decoder

SAA5700

HIGH LEVEL I2C-BUS COMMAND INTERFACE

This device communicates via the I2C-bus using the SAFARI protocol. The following section indicates the protocol which
is supported by this decoder.

User commands

Table 1 lists the CCST user command codes in TV mode; Table 2 lists the CCST user command codes in Text mode.

Table 1 TV mode user command codes

FUNCTION ID

(HEX)

FUNCTION

00 −
01 −
02 −
03 PICTURE
04 STATUS
05 −
06 −
07 TIME
08 −
09 −
0A −

0B −
0C −
0D −
0E −
0F −

10 TV PROGRAMME 0

11 TV PROGRAMME 1

12 TV PROGRAMME 2

13 TV PROGRAMME 3

14 TV PROGRAMME 4

15 TV PROGRAMME 5

16 TV PROGRAMME 6

17 TV PROGRAMME 7

18 TV PROGRAMME 8

19 TV PROGRAMME 9
1A TV PROGRAMME10
1B TV PROGRAMME11
1C TV PROGRAMME 12
1D TV PROGRAMME 13
1E TV PROGRAMME14
1F TV PROGRAMME 15

Table 2 Text mode user command codes

FUNCTION ID

(HEX)

FUNCTION

20 RED
21 GREEN
22 YELLOW
23 SUBTITLE
24 STATUS
25 HOLD TOGGLE
26 REVEAL
27 CANCEL TOGGLE
28 INDEX

29 −
2A BROWSE
2B REVEAL SET TOGGLE
2C −
2D PREVIOUS
2E DISPLAY CHINESE PROMPT
2F SUBCODE TOGGLE

30 1

31 2

32 3

33 4

34 5

35 6

36 7

27 8

28 9

29 0
3A SIZE
3B UP
3C DOWN
3D CYAN
3E MIX
3F TEXT

1997 May 16 8

Philips Semiconductors Preliminary specification

Chinese Character System Teletext
(CCST) decoder

SAA5700

Extended commands

The extended commands for the decoder are listed in Table 3.

Table 3 Extended commands

OBJECT FUNCTION

PARAMETER LENGTH

(BYTES)

PARAMETERS

NAME

ID

(HEX)

NAME

ID

(HEX)

INPUT OUTPUT INPUT OUTPUT

Display 48 set sync mode 04 1 − sync mode none

set display
position

08 4 −

row start, line start none

Processor 52 restart software 06 3 − FFFFFCH none
Memory and OSD 53 read packet 03 1

[+1]

40 packet number,

[Designation
code]

packet data

write packet 06 1

+40

− packet number,
packet data

none

OSD mode on 08 0 − none none
OSD mode off 0A 0 − none none
OSD display 0E 0 − none none
clear display page 10 0 − none none