PM7367 datasheet(305/323 Pages) PMC

305 / 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

291

Figure 30 – PCI Target Disconnect

PCICLK

FRAMEB

123

STOPB

DEVSELB

The PCI Target Abort Diagram (Figure 31) illustrates the case when the target

wants to abort the current cycle. Note, when the FREEDM-32P32 is the target, it

never aborts the current cycle. A target abort is an indication of a serious error

and no data is transferred.

A target can terminate the current cycle by asserting STOPB and negating

DEVSELB. If the FREEDM-32P32 is the initiator and the target aborts the

current access, the abort condition is reported to the PCI Host.

During clock 1, a cycle is in progress.

During clock 2, the target negates DEVSELB and TRDYB and asserts STOPB to

indicate an abort condition to the initiator.

During clock 3, the initiator negates FRAMEB in response to the abort request.

During clock 4, the target negates STOPB signal in response to the FRAMEB

signal being negated.

Figure 31 – PCI Target Abort

PCICLK

FRAMEB

123

TRDYB

DEVSELB

STOPB

PM7367 Datasheet(PDF) 305 Page - PMC-Sierra, Inc