Product specifications

CN333 Data Sheet
Revision 1.0, January 5, 2005 -66- Device 0 Function 7 Register Descriptions – V-Link
V-Link Compensation / Drive Control
Offset B4 – V-Link NB Compensation Control (00h) ....RW
7-5 V-Link Autocomp Output Value – High Drive .RO
4 Reserved ........................................ always reads 0
3-1 V-Link Autocomp Output Value – Low Drive.. RO
0 Compensation Select
0 Auto Comp (use values in bits 7-5, 3-1) default
1 Manual Comp (use values in RxB5, B6)
Offset B5 – V-Link NB Strobe Drive Control (00h).......RW
7-5 V-Link Strobe Pullup Manual Setting (High)
4 Reserved ........................................ always reads 0
3-1 V-Link Strobe Pulldown Manual Setting (Low)
0 Reserved ........................................ always reads 0
Offset B6 – V-Link NB Data Drive Control (00h) ..........RW
7-5 V-Link Data Pullup Manual Setting (High)
4 Reserved ........................................ always reads 0
3-1 V-Link Data Pulldown Manual Setting (Low)
0 Reserved ........................................ always reads 0
Offset B7 – V-Link NB Receive Strobe Delay (00h).......RW
7-2 Reserved ........................................ always reads 0
1-0 NB V-Link Strobe Delay for Receiving
00 150 psec early ........................................default
01 No delay
10 150 psec late
11 300 psec late
VT8237R South Bridge:
Offset B8 – V-Link SB Compensation Control (00h) .... RW
7-5 V-Link Autocomp Output Value – High Drive .RO
4-1 Reserved ........................................always reads 0
0 Compensation Select
0 Auto Comp (use values in bits 7-5)....... default
1 Manual Comp (use values in RxB9)
Offset B9 – V-Link SB Strobe Drive Control (00h)....... RW
7-5 V-Link Strobe Pullup Manual Setting (High)
4 Reserved ........................................always reads 0
3-1 V-Link Strobe Pulldown Manual Setting (Low)
0 Reserved ........................................always reads 0
VT8233 South Bridge (VT8233, VT8233A):
Offset B8 – V-Link SB Compensation Control (00h) .... RW
7-6 V-Link Autocomp Output Value ......always reads 0
5 Pullup Compensation Selection
0 Auto Comp (use values in bits 7-6)....... default
1 Manual Comp (use values in bits 3-2)
4 Pulldown Compensation Selection
0 Auto Comp (use values in bits 7-6)....... default
1 Manual Comp (use values in bits 1-0)
3-2 Pullup Compensation Manual Setting.......... def = 0
1-0 Pulldown Compensation Manual Setting.....def = 0
Offset B9 – V-Link SB Drive Control (00h) ................... RW
7-6 SB V-Link Strobe Pullup Manual Setting
5-4 SB V-Link Strobe Pulldown Manual Setting
3-1 Reserved ........................................always reads 0
0 SB V-Link Slew Rate Control
0 Disable................................................... default
1 Enable
DRAM Above 4G Support
Offset E4 – Low Top Address Low (00h) ....................... RW
(same as Function 3 Rx84)
Offset E5 – Low Top Address High (FFh)...................... RW
(same as Function 3 Rx85)
Offset E6 – SMM / APIC Decoding (01h)....................... RW
(same as Function 3 Rx86)