User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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11.2.11. GFXCMDPARSER_ARB_ON_OFF
The GFXCMDPARSER_ARB_ON_OFF instruction is used to inform the input interface to turn on/off
all the rings except the ring that this instruction is executed from. It can be use from a batch buffer. This
instruction can be used to prevent other ring buffers from interrupting an instruction sequence. The
format is:
DWord Bits Description
0 31:29 Client: 000 – Instruction Parser
28:23 Opcode: 08h
22:1 Reserved.
0 Arbitration ON/OFF:
1 = ON
0 = OFF
11.2.12. GFXCMDPARSER_OVERLAY_FLIP
DWord Bits Description
0 31:29 Client: 000 – Instruction Parser
28:23 Instruction Target: 11h
22:6 Reserved.
5:0 Dword Length: 00h
1 31:29 Reserved. MBZ
28:03 Register Update Address: This address is used by the Overlay at the next VBLANK
event to start requesting data from memory.
2:0 Reserved. MBZ
11.2.13. GFXCMDPARSER_LOAD_SCAN_LINES_INCL
This instruction is used to initialize the scan line window registers in the Display engine. If the display
refresh is within this window the Display engine asserts a signal that is used by the instruction parser to
process the WAIT_FOR_EVENT instruction. This instruction overrides any previous EXCL instruction.
The format is:
DWord Bits Description
0 31:29 Client: 000 – Instruction Parser
28:23 Instruction Target: 12h
22:6 Reserved.
5:0 Dword Length: 00h
1 31:16 Start Scan Line Number. (Line 0 is the first line of the display frame)
15:0 End Scan Line Number. (Line 0 is the first line of the display frame)