Product specifications

CN333 Data Sheet
Revision 1.0, January 5, 2005 -61- Device 0 Function 7 Register Descriptions – V-Link
Offset 46 – NB V-Link Misc Control (00h) .....................RW
7 Downstream High Priority
0 Disable High Priority Down Commands .....def
1 Enable High Priority Down Commands
6 Downlink Priority
0 Treat Downlink Cycles as Normal Priority.def
1 Treat Downlink Cycles as High Priority
5-4 Combine Multiple STPGNT Cycles Into One V-
Link Command
00 Compatible, 1 command per V-Link cmd....def
01 2 commands per V-Link command
10 3 commands per V-Link command
11 4 commands per V-Link command
3-2 V-Link Master Access Ordering Rules
00 High priority read, pass normal read (not pass
write) .....................................................default
01 Read (high/normal) pass write (HR>LR>W)
1x Read / write in order (ignore bit-1)
1 Read Around Write (ignored if bit-3 = 1)
0 Reads always pass writes .......................default
1 8RAW
0 Reserved ........................................ always reads 0
Offset 47 – V-Link Control (00h).....................................RW
7-6 Reserved ........................................ always reads 0
5 C2P Read L1 Ready Return Timing
0 V-Link bus decodes C2P Read Ack cmd .....def
1 Wait till previous P2C write cycles all flushed
4 Reserved ........................................ always reads 0
3 Down Strobe Dynamic Stop
0 Disable ...................................................default
1 Enable
2 Auto-Disconnect
0 Disable ...................................................default
1 Enable
1 V-Link Disconnect Cycle for STPGNT Cycle
0 Disable ...................................................default
1 Enable
0 V-Link Disconnect Cycle for HALT Cycle
0 Disable ...................................................default
1 Enable
Offset 48 – NB/SB V-Link Configuration (18h)............. RW
7 V-Link Parity Check
0 Disable................................................... default
1 Enable
6 Reserved ........................................always reads 0
5 16-bit Bus Width Supported
0 Not Supported........................................ default
1 Supported
4 8-Bit Bus Width Supported
0 Not Supported
1 Supported ............................................. default
3 4x Rate Supported
0 Not Supported
1 Supported ............................................. default
2 Reserved ........................................always reads 0
1 V-Link Split Bus
0 Disable................................................... default
1 Enable
0 8x Rate Supported
0 Not Supported........................................ default
1 Supported
Transfers
V- Per
Link 66MHz Bus Rx48 Rx48 Rx48
Mode
Cycle Bits Usage Bit-4 Bit-5 Bit-1
0 4x 8 Bidirectional 0 0 0
1 8x 4+4 Split 1 0 1
2 8x 8 Bidirectional 1 0 0
3 4x 16 Bidirectional 0 1 0
4 8x 8+8 Split 1 1 1
Offset 49 – SB V-Link Capability (19h).......................... WC
7-6 Reserved ........................................always reads 0
5 16-bit Bus Width Supported by SB.................... RO
0 Not Supported........................................ default
1 Supported
4 8-Bit Bus Width Supported by SB ..................... RO
0 Not Supported
1 Supported ............................................. default
3 4x Rate Supported by SB.................................... RO
0 Not Supported
1 Supported ............................................. default
2 2x Rate Supported by SB.................................... RO
0 Not Supported........................................ default
1 Supported
1 Reserved ........................................always reads 0
0 8x Rate Supported by SB.................................... RO
0 Not Supported
1 Supported ............................................. default