Philips saa5700 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

SAA5700

Chinese Character System Teletext
(CCST) decoder

Preliminary specification
File under Integrated Circuits, IC02

1997 May 16

Philips Semiconductors Preliminary specification

Chinese Character System Teletext
(CCST) decoder

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

2

• Easy control via high level I

• Sync mode switching and picture centring via I2C-bus

SAFARI commands

• Supports external decryption unit for encrypted data.

C-bus SAFARI commands

SAA5700

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

PACKAGE

TYPE NUMBER

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 2

Philips Semiconductors Preliminary specification

Chinese Character System Teletext
(CCST) decoder

BLOCK DIAGRAM

handbook, full pagewidth

BLACK

CVBS

REF+

STN

I

REF

V

DDD1VSS1VDDD2VSS2VSS3VDDXVSSOVDDAVSSAVSS

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

35

4

5

10
6

7

SYNC

SEPARATOR

DATA

ACQUISITION

FRONT END

12 MHz

ACQUISITION

TIMING

OSCILLATOR

AND CLOCK

GENERATOR

6 MHz

SAA5700

26

1

OSCOUT

64

OSCIN

59

RESET

ROMCS

RAS

CAS

RA10 to RA0

RD7 to RD0

WE

27
42
53
44

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

55 to 58,
52, 51,
47, 46

PACKET
BUFFER

MEMORY

INTERFACE

SAA5700

BUS

PROCESSOR

BLOCK

24 MHz

DISPLAY

INTERFACE

DISPLAY

TIMING

DISPLAY SECTION

63
60
61
62

21
22
23
24

17
18
25

MGG539

DCL
DDA
SCL
SDA

R
G
B
BLAN

LFB
FFB/STTV
ODD/EVEN

Fig.1 Block diagram.

1997 May 16 3

Philips Semiconductors Preliminary specification

Chinese Character System Teletext

SAA5700

(CCST) decoder

PINNING

SYMBOL PIN I/O DESCRIPTION

OSCOUT 1 O oscillator output to crystal
V

SS3

n.c. 3 − not connected
BLACK 4 I/O black level sample and hold capacitor; 100 nF to V
CVBS 5 I video signal input; 100 nF series capacitor, 250Ω source impedance maximum,

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

REF

V

SSA

V

DDA

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

n.c. 15 − not connected
V

SS

LFB 17 I scan line flyback input (HSYNC)
FFB/STTV 18 I/O scan field flyback input (VSYNC)/sync to TV output
V

DDX

V

SSO

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

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

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

SSA

reference to V

7 I current reference input; 10 kΩ to V

SSA

SSA

SSA

8 ground 0 V power supply; analog
9 supply +5 V power supply; analog

SSA

14 ground connect to VSS for normal use

16 ground connect to VSS for normal use

19 supply +5 V power supply; connect to VDD for normal use
20 ground output stage current return and 0 V

26 ground connect to VSS for normal use

SS1

and V

SS2

1997 May 16 4

Philips Semiconductors Preliminary specification

Chinese Character System Teletext
(CCST) decoder

SYMBOL PIN I/O DESCRIPTION

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

SS1

n.c. 34 − not connected
V

DDD1

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

V

SS2

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
SDA 62 I/O primary I
DCL 63 O serial clock to optional Decryptor
OSCIN 64 I oscillator input from crystal/external clock input

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

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

48 supply +5 V power supply digital; connected internally to V
49 ground 0 V power supply digital; connected internally to V

2

C-bus serial clock input

2

C-bus serial data

SS2

DD2

DD1

SS1

and V

and V

SAA5700

SS3

SS3

1997 May 16 5

Philips Semiconductors Preliminary specification

Chinese Character System Teletext
(CCST) decoder

handbook, full pagewidth

DCL

SDA

SCL

62

61

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

OSCIN
64

63
1
2
3
4
5
6
7
8
9

10
11
12
13
14
15
16
17
18
19

DDA
60

SAA5700

RESET
59

RD4
58

RD5
57

RD6
56

RD7
55

RA10
54

CAS
53

RD3
52

SAA5700

51

RD2
n.c.

50

V

49

SS2

V

48

DDD2

RD1

47

RD0

46

i.c.

45

WE

44

n.c.

43

RAS

42

RA9

41

RA8

40

n.c.

39

RA7

38

RA6

37

RA5

36

V

35

DDD1

n.c.

34

V

33

SS1

20

21

22

23

24

25

B

G

BLAN

ODD/EVEN

SSO

V

R

Fig.2 Pin configuration.

1997 May 16 6

26

V

SS

27

28

RA0

ROMCS

29

RA1

30

RA2

31

RA3

32

RA4

MGG538

Philips Semiconductors Preliminary specification

Chinese Character System Teletext

SAA5700

(CCST) decoder

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)

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

FUNCTION

Table 2 Text mode user command codes

FUNCTION ID

(HEX)

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

FUNCTION

1997 May 16 7

Philips Semiconductors Preliminary specification

Chinese Character System Teletext

SAA5700

(CCST) decoder

Extended commands

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

Table 3 Extended commands

OBJECT FUNCTION

NAME

Display 48 set sync mode 04 1 − sync mode none

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

ID

(HEX)

NAME

set display
position

write packet 06 1

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

(HEX)

08 4 −

PARAMETER LENGTH

(BYTES)

ID

INPUT OUTPUT INPUT OUTPUT

[+1]

+40

PARAMETERS

row start, line start none

40 packet number,

[Designation
code]

− packet number,
packet data

packet data

none

1997 May 16 8