Product specifications

CN333 Data Sheet
Revision 1.0, January 5, 2005 -55- Device 0 Function 3 Register Descriptions - DRAM
Graphics Control
Offset B0 – Graphics Control 1 (00h)..............................RW
7-4 Reserved ........................................ always reads 0
3 Frame Buffer Rank Searching
0 Automatic...............................................default
1 Select bank per bits 2-0
2-0 Frame Buffer Rank Location
Offset B1 – Graphics Control 2 (00h)..............................RW
7-4 Current High Channel Granted (Normal Priority)
and Request Pending Low Request Just Arrived ...
.................................................... def = 0
3-0 Current Low Channel Granted and Request
Pending High Request Just Arrived............. def = 0
Offset B2 – Graphics Control 3 (00h)..............................RW
7-4 Lot Counter for High Channel to Extend
Arbitration Slot to High Requests ................ def = 0
3-0 Lot Counter for Low Channel to Extend
Arbitration Slot to Low Requests................. def = 0
Offset B3 – Graphics Control 4 (00h)..............................RW
7 Reserved ........................................ always reads 0
6-4 Graphics Write Queue Threshold ................ def = 0
3-0 Graphics VM FIFO Threshold..................... def = 0
Offset B4 – Graphics Control 5 (00h)..............................RW
7-4 Reserved ........................................ always reads 0
3 Graphics Read / Write Order Control
0 R/W may be out of order........................default
1 Keep original low channel R/W order as
received from graphics controller
2 Optimize Graphics Arbitration with DRAM Hit /
Miss Consideration
0 Disable ...................................................default
1 Enable
1 Qualify Length from Graphics Controller to
Differentiate 2QW / 4QW Requests
0 Disable ...................................................default
1 Enable
0 Alternate Arbitration to Low / High Channel
Read When Both Hit
0 Disable ...................................................default
1 Enable
AGP Controller Interface Control
Offset C0 – AGP Controller Interface Control (00h) .... RW
7-3 Reserved ........................................always reads 0
2 Graphics AGP Read Data Delay
0 No delay ................................................ default
1 Delay 1 clock
1 AGP Controller Interface Pipe Mode (Graphics)
0 Pipe .................................................... default
1 Pipe bypass
0 AGP Controller Interface Pipe Mode (North
Bridge)
0 Pipe .................................................... default
1 Pipe bypass