PM7366-PI datasheet(267/286 Pages) PMC

267 / 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

254

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-8 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-8 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

PM7366-PI Datasheet(PDF) 267 Page - PMC-Sierra, Inc