PM7367 datasheet(33/323 Pages) PMC

33 / 323 page

PM7367 FREEDM-32P32

DATA SHEET

PMC-1991499

ISSUE 2

FRAME ENGINE AND DATA LINK MANAGER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE

Pin Name

Type

No.

Function

STOPB

I/O

L20

The active low stop signal (STOPB) requests

the initiator to stop the current bus transaction.

When STOPB is set high by a target, the

initiator continues with the transaction. When

STOPB is set low, the initiator will stop the

current transaction.

When the FREEDM-32P32 is the initiator,

STOPB is an input. When STOPB is sampled

low, the FREEDM-32P32 will terminate the

current transaction in the next PCICLK cycle.

When the FREEDM-32P32 is the target,

STOPB is an output. The FREEDM-32P32 only

issues transaction stop requests when

responding to reads and writes to configuration

space (disconnecting after 1 DWORD

transferred) or if an initiator introduces wait

states during a transaction.

When the FREEDM-32P32 is not involved in

the current transaction, STOPB is tri-stated.

STOPB is updated on the rising edge of

PCICLK or sampled on the rising edge of

PCICLK depending on whether it is an output or

an input.

IDSEL

Input

F20

The initialization device select signal (IDSEL)

enables read and write access to the PCI

configuration registers. When IDSEL is set high

during the address phase of a transaction and

the C/BEB[3:0] code indicates a register read or

write, the FREEDM-32P32 performs a PCI

configuration register transaction and asserts

the DEVSELB signal in the next PCICLK period.

IDSEL is sampled on the rising edge of

PCICLK.

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