VT8601 Via, VT8601 Datasheet - Page 111

• Manufacturer Part Number: VT8601
• Description: Slot-1 / Socket-370 PCI North Bridge
• Manufacturer: Via

Digital TV Control Registers
CRD3-D0 – VGA / Digital TV Sync Control 1 ................ RW
(see also CRD8, Digital TV Interface Control)
Revision 1.3 September 8, 1999
31-27 Reserved
26-16 Vertical Data Load
12-9 Reserved
8-0
15
14
13
7HFKQRORJLHV ,QF
VGA Slave Mode for DTV
H/V Data Load
Digital Hsync Direction
Horizontal Data Load
:H &
:H &R R QQHFW
0
1
0
1
0
1
QQHFW
Disable ...................................................default
Enable
Disable ...................................................default
Enable
Input .....................................................default
Output
........................................ always reads 0
........................................ always reads 0
-105
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
VT8601 Apollo ProMedia
VGA Extended Registers