PM7366-PI datasheet(33/286 Pages) PMC

33 / 286 page

RELEASED

PM7366 FREEDM-8

DATA SHEET

PMC-1970930

ISSUE 4

FRAME ENGINE AND DATA LINK MANAGER

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

Pin No.

Pin Name

Type

-PI

-BI

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-8 is the initiator, STOPB is an

input. When STOPB is sampled low, the FREEDM-8

will terminate the current transaction in the next

PCICLK cycle.

When the FREEDM-8 is the target, STOPB is an

output. The FREEDM-8 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-8 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-8

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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