VT8601 Via, VT8601 Datasheet - Page 120

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

GEbase + 20 – Graphics Engine Status ............................ RO
Writing to this register resets the GE.
Revision 1.3 September 8, 1999
18-11 Reserved
10-0 Scan Line Currently Being Displayed
31
30
29
28
27
26
25
24
23
22
21
20
19
7HFKQRORJLHV ,QF
Bresenham Engine Status
Setup Engine Status
SP / DPE Status
Memory Interface Status
Command List Processing Status
Block Write Status
Command Buffer Status
Reserved
PCI Write Buffer Status
Z Check Status
Logically, this bit is the OR of all Z test results
performed in the latest command
Effective Status
Left View Status
Last View Displayed / Being Displayed
:H &
:H &R R QQHFW
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
QQHFW
Idle
Busy
Idle
Busy
Idle
Busy
Idle
Busy (access for screen refresh doesn’t count)
Idle
Busy
Idle
Busy
Not full
Full
Empty
Not empty
Engine busy: All Z tests performed so far have
failed in the command being executed.
Engine idle: All Z tests performed in the last
command have failed.
Otherwise
Current display base register is not yet
effective (the frame is not displayed)
It is effective
Current display base register is not yet
effective (the frame is not displayed)
It is effective
Right View
Left View
........................................ always reads 0
........................................ always reads 0
-114
There are two input FIFOs to buffer data and commands from
the host, the Command FIFO (8 levels deep) and the
Bresenham FIFO (2 levels deep).
Drawing Environment, and Frame Buffer Control are routed
through the Command FIFO. Primitive Type and Geometry
Primitives are routed through the Bresenham FIFO.
Commands in the Command FIFO don’t take effect until a
prior command is executed or the task in progress is finished.
Parameters in the Bresenham FIFO don’t take effect until a
prior parameter is phased out (reaches the end of an edge).
VT8601 Apollo ProMedia
3D Graphics Engine Registers
Drawing commands,