CS4955 PIN ASSIGNMENTS
PIN NAME
NUMBER
TYPE
DEFINITION
V[7:0]
8,7,6,5,4,3,2,1
IN
Digital video data inputs
CLK
29
IN
27MHz input clock
PADR
16
IN
Address enable line
XTAL-IN
15
IN
Sub-carrier crystal input
XTAL-OUT
14
OUT
Sub-carrier crystal output
HSYNC/CB
10
I/O
Active low horizontal sync, or composite blank signal
VSYNC
11
I/O
Active low vertical sync
FIELD/CB
9
OUT
Video field ID. Selectable polarity or composite blank
RD
27
IN
Host parallel port read strobe, active low
WR
28
IN
Host parallel port write strobe, acti ve low
PDAT[7:0]
19,20,21,22,23,24,25,26
I/O
Host parallel port/general purpose I/O
SDA
32
I/O
I C data
SCL
33
IN
I C clock input
CVBS
44
CURRENT
Composite video output
Y
48
CURRENT
Luminance analog output
C
47
CURRENT
Chrominance analog output
R
39
CURRENT
Red analog output
G
40
CURRENT
Green analog output
B
43
CURRENT
Blue analog output
VREF
38
I/O
Internal voltage reference output external reference input
SET
37
CURRENT
DAC current set
TTXDAT
30
IN
Teletext data input
TTXRQ
31
OUT
Teletext request output
INT
12
OUT
Interrupt output, active high
RESET
34
IN
Active low master RESET
TEST
13
IN
Test pin. Ground for normal operation
VAA
36,41,46
PS
+5V or +3.3Vsupply(must be same as VDD)
GNDD
18
PS
Ground
VDD
17
PS
+5V or +3.3Vsupply(must be same as VAA)
GNDA
35,42,45
PS
Ground
CS4955 BLOCK DIAGRAM
16
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