Signal Description
2.3
PCI Bus Interface 64-bit Extension
There are two sets of PCI Bus extension signals; one for PCI Bus A and one for PCI Bus B.
Table 2-3. PCI Bus Interface 64-bit Extension Interface A and B Signals
Signal
Type Description
PAACK64#
PBACK64#
I/O
I/O
PCI Interface Acknowledge 64-bit Transfer: This signal is asserted by the
target only when PxREQ64# is asserted by the initiator. It indicates the target’s
ability to transfer data using 64 bits. It has the same timing as PxDEVSEL#.
PAAD[63:32]
PBAD[63:32]
PCI Address/Data: These signals are a multiplexed address and data bus. This
bus provides an additional 32 bits to the PCI bus. During the data phases of a
transaction, the initiator drives the upper 32 bits of 64-bit write data, or the target
drives the upper 32 bits of 64-bit read data, when PxREQ64# and PxACK64# are
both asserted.
PACBE_[7:4]#
PBCBE_[7:4]#
I/O
Bus Command and Byte Enables (Upper 4 bits): These signals are a
multiplexed command field and byte enable field. For both read and write
transactions, the initiator will drive byte enables for the PxAD[63:32] data bits on
PxCBE_[7:4]# during the data phases when PxREQ64# and PxACK64# are both
asserted.
PAPAR64
PBPAR64
I/O
I/O
PCI Interface Upper 32-bits Parity: This signal carries the even parity of the 36
bits of PxAD[63:32] and PxCBE_[7:4]# for both address and data phases.
PAREQ64#
PBREQ64#
PCI interface Request 64-bit Transfer: This signal is asserted by the initiator to
indicate that the initiator is requesting a 64-bit data transfer. It has the same timing
as PxFRAME#. When the Intel® 6700PXH 64-bit PCI Hub is the initiator, this
signal is an output. When the Intel® 6700PXH 64-bit PCI Hub is the target, this
signal is an input.
2.4
Interrupt Interface
This section lists the interrupt interface signals. There are two sets of IRQ interrupt signals;
PAIRQ_[15:0]# for PCI Bus A and PBIRQ_[15:0]# for PCI Bus B.
Table 2-4. Interrupt Interface A and B Signals
Signal
Type Description
PAIRQ_[15:0]#
PBIRQ_[15:0]#
I
Interrupt Request Bus: The PxIRQ# lines from PCI interrupts PIRQ[A:D] can be
routed to these interrupt lines. PBIRQ_[15:0]# are connected to a second internal
I/OxAPIC that resides on the PCI Express* interface.
22
Intel® 6700PXH 64-bit PCI Hub Datasheet
INTEL [ INTEL ]
