VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-91
VGA Extended Registers
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
VGA Extended Registers – CRT Controller Indexed
CRE – CRT Module Test..................................................RW
7
Extended Memory Access Above 256KB
0
Disable ...................................................default
1Enable
6
VGA Misc Output Register (3C2) Write Protect
0
Writes to 3C2 Allowed...........................default
1
Write Protect 3C2
5
CRT Start Address Bit-16
4-3
Reserved
....................................... alwatys reads 0
2
Interlaced Mode
0
Disable ...................................................default
1Enable
1-0
Reserved for Test (Do Not Program) .... default = 0
CR19 – CRT Interlace Control ........................................RW
7-0
Interlaced Vsync Adjust Value
CR1A – Arbitration Control 1 ........................................ RW
7-0
Display Queue Kill Counter .................... default = 0
Controls how many requests can be accepted by the
arbiter before changing the owner to another agent
(00 disables the counter).
CR1B – Arbitration Control 2......................................... RW
7-0
High Priority Arbiter Kill Counter ........ default = 0
Controls how many requests can be accepted by the
arbiter before changing the owner to another agent
(00 disables the counter).
CR1C – Arbitration Control 3 ........................................ RW
7-0
Low Priority Arbiter Kill Counter ......... default = 0
Controls how many requests can be accepted by the
arbiter before changing the owner to another agent
(00 disables the counter).
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