SAA7205 データシートの表示（PDF） - Philips Electronics
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SAA7205 Datasheet PDF : 84 Pages
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Philips Semiconductors
MPEG-2 systems demultiplexer
Preliminary specification
SAA7205H
SYMBOL
VDDD2
CCLKI
VSSD2
TTR
TTD
TTC
EVEN/ODD
VDDD3
VSYNC
HSYNC
COMSYNC
CbREF
CLK13.5
VIN
VSSD3
RAMIO3
RAMIO4
RAMIO5
RAMIO6
RAMIO7
OERAM
RAMIO2
RAMIO1
RAMIO0
VDDD4
RAMA0
RAMA1
RAMA2
RAMA3
RAMA4
RAMA5
RAMA6
RAMA7
VSSD4
RAMA12
RAMA14
RAMA11
RAMA9
RAMA8
RAMA13
WERAM
1997 Jan 21
PIN
I/O
DESCRIPTION
34 supply digital supply voltage 2 (+5 V)
35
I 27 MHz demultiplexer chip clock Input
36
GND digital ground 2
37
I teletext data request input (for VBI insertion of TXT)
38
O serial teletext data output (6.75 or 6.9375 Mbit/s)
39
O TXT clock (6.75 MHz = CCLKI/4)
40
O field parity output, internally generated, locked to COMSYNC
41 supply digital supply voltage 3 (+5 V)
42
O vertical sync output, locked to CCLKI and optionally VIN
43
O horizontal sync output, internally generated
44
O (CCIR601) composite sync (50 and 60 Hz)
45
O indicating U samples in UY and VY video decoder output
46
O equals CCLKI/2
47
I receiver local vertical sync input, locked to CCLKI (optional)
48
GND digital ground 3
49
I/O external SRAM input/output bus bit 3
50
I/O external SRAM input/output bus bit 4
51
I/O external SRAM input/output bus bit 5
52
I/O external SRAM input/output bus bit 6
53
I/O external SRAM input/output bus bit 7
54
O output enable for external 32K × 8 SRAM (active LOW)
55
I/O external SRAM input/output bus bit 2
56
I/O external SRAM input/output bus bit 1
57
I/O external SRAM input/output bus bit 0
58 supply digital supply voltage 4 (+5 V)
59
O external SRAM address bus output bit 0
60
O external SRAM address bus output bit 1
61
O external SRAM address bus output bit 2
62
O external SRAM address bus output bit 3
63
O external SRAM address bus output bit 4
64
O external SRAM address bus output bit 5
65
O external SRAM address bus output bit 6
66
O external SRAM address bus output bit 7
67
GND digital ground 4
68
O external SRAM address bus output bit 12
69
O external SRAM address bus output bit 14
70
O external SRAM address bus output bit 11
71
O external SRAM address bus output bit 9
72
O external SRAM address bus output bit 8
73
O external SRAM address bus output bit 13
74
O write enable output for external SRAM (active LOW)
7
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