CL-GD6420
Notebook VGA Controller
2.
Detailed Pin Description (cont.)
Name
Pin No. Type
71 AO
79, 78, 76 I/O
I/O
Description
ANALOG BLUE.
BIOS ADDRESS 13 - 15.
B
BIOS-A[13:15]
BIOS-ROMEN*/SSCLK 80
BIOS-ROM ENABLE: This output is used to enable C000
BIOS ROM if the CL-GD6420 is used in an adapter card ap-
plication. SCREEN SAVE CLOCK: This input is used to de-
tect keyboard activity for Standby Mode in motherboard ap-
plications.
STANDBY*
74
I
STANDBY: This input is used to initiate Standby Mode from
an external source. It can be used in conjunction with the
software method. It is asynchronous active low.
IREF
72
73
AI
RAMDAC CURRENT REFERENCE.
AVSS
PW
RAMDAC ANALOG V
RAMDAC ANALOG V
.
SS
AVDD
66
PW
PW
.
DD
V
40, 77
V
PINS.
CC
CC
132, 149
GND
29, 56,
PW
GROUND PINS.
81, 91, 110
127, 155
Reserved
14, 68, 69, 75
Reserved (May be connected to ground).
10
July 1993
DATA BOOK
CIRRUS [ CIRRUS LOGIC ]
