VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-100
VGA Extended Registers
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
CR8F-8E – Video Display Engine Flags..........................RW
15
Planar Capture Mode
0
Planar 420 Capture.................................default
1
Planar 422 Capture
14
VSYNC Test / Graphics Engine Reset
0
Disable ...................................................default
1Enable
13
Edge Recovery Algorithm Control
0
Disable ...................................................default
1Enable
12
Window 1 Vertical Interpolation
0
Disable ...................................................default
1Enable
11
Window 1 Horizontal Interpolation
0
Disable ...................................................default
1Enable
10
CSC / Bypass Select
0
CSC .....................................................default
1Bypass
9
Line Toggle for Line Buffer
0
Normal ...................................................default
1
Toggle (Reversed)
8
Reserved
........................................ always reads 0
7-5
Window 1 HDEO Delay Adjust .............. default = 4
4
Video Window 1
0
Disable ...................................................default
1Enable
3
CCIR-/ DTV Input Video Data Control
0
CCIR Format ..........................................default
1DTV Format
2-1
W1 / W2 Line Buffer Page Break Level Control
00 8 levels ...................................................default
01 16 levels
1x 32 levels
0
Video Window 2
0
Disable ...................................................default
1Enable
CR91-90 – Window 1 / W1-Y Row Byte Offset ..............RW
15-14 Reserved
........................................ always reads 0
13-0 Video Row Byte Offset
Programmed with the number of bytes in a row
CR94-92 – Window 1 / W1-Y Video Start Address........RW
23-21 Reserved
........................................ always reads 0
20
Used with CR97 bit-7
19-0 Video Start Addres (in bytes)
CR95 – Video Window Line Buffer Threshold .............. RW
7
Line Buffer Level Bit-8 (used with CR96)
6-0
W1 / W2 Line Buffer Request Threshold Value
When the line buffer is less than this value, a memory
request will be issued. The value programmed in this
register must be less than the line buffer level (see bit-
7 and CR96).
CR96 – Window 1 / W1-Y Line Buffer Level Control .. RW
7-0
Line Buffer Levels (bit-8 is in CR95[7])
RGB8: (pixel # + 2) / 8 rounded up
YUV 4:2:2: (Pixel # + 2) / 4 rounded up
For W1-U or W1-V, the level is this value divided by
4 or 16, depending on the panar format (YUV12 or
YUV9)
CR97 – Video Display Engine Flags................................ RW
7
Start Address Reload Control
0
CR94[4]=0 address can be reloaded any time
1
CR94[4]=0 only reloaded during Vsync
x
CR94[4]=1 address not reloaded
6
Video Start Reference Select
0
HSYNC / VSYNC ................................. default
1
Use fixed signals (fixed relationship with HDE
and VDE) as video start reference
5
Address Point Invert
0
Normal ................................................... default
1
Invert
4
Odd / Even Invert (Anti-tearing)
0
Normal ................................................... default
1
Invert
3
Playback Test Mode Select (RGB Data Select)
2
Playback Test Mode
0
Disable................................................... default
1Enable
1
Anti-tearing Sync Select
0
VGA Vsync ........................................... default
1
Playback Vsync
0
Anti-tearing
0
Disable................................................... default
1Enable
This bit is automatically disabled if there is only one
video stream and dual live video mode is enabled. In
this mode, the even field is used for one live video
stream and the odd field is used for the other live
video stream.
CR9A-98 – Capture Video Start Address....................... RW
23-20 Reserved
........................................ always reads 0
19-0 Capture Video Start Address
Controlled by SRBE (3C5 index BE).
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