VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-105
VGA Extended Registers
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
Digital TV Control Registers
CRD3-D0 – VGA / Digital TV Sync Control 1................RW
31-27 Reserved
........................................ always reads 0
26-16 Vertical Data Load
15
VGA Slave Mode for DTV
0
Disable ...................................................default
1Enable
14
H/V Data Load
0
Disable ...................................................default
1Enable
13
Digital Hsync Direction
0
Input .....................................................default
1Output
12-9 Reserved
........................................ always reads 0
8-0
Horizontal Data Load
(see also CRD8, Digital TV Interface Control)
VGA Extended Registers – CRTC Shadow
Read/Write of Shadow registers is controlled by extended
register GR30[6] (port 3CE/3CF index 30h). If GR30[6]=1,
read/write operations to CRTC indices 0, 3-7, 10-11, and 16
are performed to the shadow registers instead of to the normal
registers. Bit definitions for these registers are identical to the
standard CRTC register set.
CR00 – Shadow Horizontal Total ................................... RW
CR03 – Shadow Horizontal Blank End .......................... RW
CR04 – Shadow Horizontal Retrace Start...................... RW
CR05 – Shadow Horizontal Retrace End ....................... RW
CR06 – Shadow Vertical Total ........................................ RW
CR07 – Shadow Overflow................................................ RW
CR10 – Shadow Vertical Retrace Start .......................... RW
CR11 – Shadow Vertical Retrace End............................ RW
CR16 – Shadow Vertical Blanking End.......................... RW
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