Product specifications

VT8601A Apollo PLE133
Revision 1.82 October 22, 2001 -104- VGA Extended Registers
Technologies, Inc.
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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
1 Enable
14 H/V Data Load
0 Disable ................................................... default
1 Enable
13 Digital Hsync Direction
0 Input ..................................................... default
1 Output
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