VT8601 Via, VT8601 Datasheet - Page 74

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

Port 2287-2284 – MC Command Queue ......................... RW
This register changes definition when written with bit-0 = 1.
This address then becomes “MC Status” with the definition of
the bits matching the following bit definitions until MC-Status
bit-0 is cleared by hardware.
Revision 1.3 September 8, 1999
31-12 Page Table Address
10-9 Video Output Display Fields
8-6
5-4
3-2
11
1
0
7HFKQRORJLHV ,QF
SP Command Present
Video Output Display Buffer
MC Buffer 2
MC Buffer 1
MC Buffer is Field
MC Command in Queue
:H &
:H &R R QQHFW
000 F0
001 F1
010 F2
011 F3
100 H0
101 H1
110 H2
111 -reserved-
00 -reserved-................................................default
01 Top
10 Bottom
11 Both
00
01
10
11 No Buf 2
00
01
10
11
0
1
0
1
0
1
QQHFW
SP Command is Absent ..........................default
SP Command is Present
Bit-1 = 1
Bit-1 = 1
Not Field ................................................default
Field
Disable ...................................................default
Enable
H0
H1
H2
H0
H1
H2
n/a
.....................................................default
Bit-1 = 0
Bit-1 = 0
bottom
both
top
n/a
F0
F1
F2
F3
-68
Port 2285-2284 – MC Status ............................................ RW
The bit definitions above are valid only when bit-0 is equal to
1. When hardware clears bit-0, bit definitions revert to those
defined by the “MC Command Queue” register defined in the
left hand column of this page.
14-12 FIFO Status
10-9 Video Output Display Fields
8-6
5-4
3-2
15
11
1
0
Task Pop Out Done Status
MC Decode Done Status
Video Output Display Buffer
MC Buffer 2
MC Buffer 1
MC Buffer is Field
MC Status
000 F0
001 F1
010 F2
011 F3
100 H0
101 H1
110 H2
111 -reserved-
00 -reserved- ............................................... default
01 Top
10 Bottom
11 Both
00
01
10
11 No Buf 2
00
01
10
11
0
1
0
1
Graphics Accelerator PCI Bus Master Registers
Bit-1 = 1
Bit-1 = 1
Not Field................................................ default
Field
Not in progress....................................... default
In Progress
H0
H1
H2
H0
H1
H2
n/a
.................................................... default
VT8601 Apollo ProMedia
Bit-1 = 0
Bit-1 = 0
bottom
both
top
n/a
F0
F1
F2
F3