Signal Description
Table 2-16. PCI/PCI-X Mode and Frequency Encoding (Sheet 2 of 2)
PAPCIXCAP
(on the card)
PCI Capability
PCI-X Capability
PAM66EN
PA133EN
66 MHz
PCI-X 133 MHz
No Connect
Pull-up
Capacitor to GND
Once the Intel® 6702PXH 64-bit PCI Hub identifies the capabilities of the PCI bus devices, it
drives the initialization pattern on the PADEVSEL#, PASTOP#, PATRDY#, PAFRAME# and
PAIRDY# pins as per Table 2-17 to initialize the PCI bus devices to the proper mode and
frequency.
Table 2-17. PCI-X Initialization Pattern Driven by the Intel® 6702PXH 64-bit PCI Hub
Clock Period
(ns)
Clock Freq
(MHz)
PAPERR#
PADEVSEL#
PASTOP#
PATRDY#
Mode
Max
Min
Min
Max
Deasserted
Deasserted
Deasserted Deasserted
PCI
PCI
•
30
15
15
10
7.5
0
33
33
66
30
20
15
10
Deasserted
Deasserted
Deasserted
Deasserted
Deasserted
Deasserted
Deasserted
Deasserted
Deasserted
Deasserted
Asserted
Deasserted
Asserted
Asserted
Asserted
PCI-X Mode 1
50
66
Deasserted PCI-X Mode 1
66
100
133
Asserted PCI-X Mode 1
100
Deasserted Deasserted PCI-X Mode 1 Reserved1
Asserted
Deasserted
Asserted
Asserted
Asserted
Deasserted PCI-X Mode 1 Reserved1
Asserted
PCI-X Mode 1 Reserved1
PCI-X Mode 1 Reserved1
Asserted
Asserted
NOTE: The Intel® 6702PXH 64-bit PCI Hub never drives these patterns on the rising edge of PAPCIRST#
signal; however, these patterns may appear before the signals settle to a steady value at the rising edge
of PAPCIRST#.
2.12.2
Transaction Types
2.12.2.1
PCI Transactions
Table 2-18 lists the PCI transactions supported by the Intel® 6702PXH 64-bit PCI Hub. As a PCI
master, the Intel® 6702PXH 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® 6702PXH 64-bit PCI Hub can accept
dual address cycles up to the full 64-bit address space. The Intel® 6702PXH 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® 6702PXH
64-bit PCI Hub disconnects the transaction after the first data transfer.
The Intel® 6702PXH 64-bit PCI Hub decodes all PCI cycles in medium PADEVSEL# timing.
Intel® 6702PXH 64-bit PCI Hub Datasheet
35
INTEL [ INTEL ]
