Signal Description
Table 2-16. PCI-X Initialization Pattern Driven by the Intel® 6700PXH 64-bit PCI Hub
(Sheet 2 of 2)
Clock Period
Clock Freq
(MHz)
PxPERR#
PxDEVSEL#
PxSTOP#
PxTRDY#
Mode
(ns)
Deasserted
Deasserted
Deasserted
Asserted
Asserted
Asserted
Deasserted
Asserted
Asserted
Asserted
PCI-X Mode 1 Reserved1
Deasserted PCI-X Mode 1 Reserved1
Asserted
PCI-X Mode 1 Reserved1
NOTE: The Intel® 6700PXH 64-bit PCI Hub never drives these patterns on the rising edge of PxPCIRST#
signal; however, these patterns may appear before the signals settle to a steady value at the rising edge
of PxPCIRST#.
2.11.2
Transaction Types
2.11.2.1
PCI Transactions
Table 2-17 lists the PCI transactions supported by the Intel® 6700PXH 64-bit PCI Hub. As a PCI
master, the Intel® 6700PXH 64-bit PCI Hub has full access to the 64-bit address space and can
generate dual address cycles (DAC). As a target, the Intel® 6700PXH 64-bit PCI Hub can accept
dual address cycles up to the full 64-bit address space. The Intel® 6700PXH 64-bit PCI Hub
supports linear increment address mode only for bursting memory transfers (indicated when the
low 2 address bits are equal to 0). If either of these address bits is nonzero, the Intel® 6700PXH
64-bit PCI Hub disconnects the transaction after the first data transfer.
The Intel® 6700PXH 64-bit PCI Hub decodes all PCI cycles in medium PxDEVSEL# timing.
Table 2-17. Intel® 6700PXH 64-bit PCI Hub PCI Transactions
Intel® 6700PXH
64-bit PCI Hub As
Intel® 6700PXH
64-bit PCI Hub As
Type of Transaction
Type of Transaction
Master
Target
Master
Target
0000
Interrupt
No
No
1000
Reserved1
No
No
acknowledge
0001
0010
0011
0100
Special cycle
I/O read
Yes
Yes
Yes
No
No
No
No
No
1001
1010
1011
1100
Reserved1
No
Yes
Yes
No
No
No
Configuration Read
Configuration Write
I/O write
No
Reserved1
Memory Read
Multiple
Yes
0101
0110
0111
Reserved1
Memory read
Memory write
No
Yes
Yes
No
Yes
Yes
1101
1110
1111
Dual Address Cycle
Memory Read Line
Yes
No
No
Yes
Yes
Yes
Memory Write and
Invalidate
NOTES:
1. The Intel® 6700PXH 64-bit PCI Hub never initiates a PCI transaction with a reserved command code and
ignores reserved command codes as a target.
38
Intel® 6700PXH 64-bit PCI Hub Datasheet
INTEL [ INTEL ]
