PM7367 Datasheet, PDF (305/323 Pages) PMC-Sierra, Inc – 32 link, 32 Channel Data Link Manager with PCI Interface

DATA SHEET
PMC-1991499
ISSUE 2
Figure 30 – PCI Target Disconnect
1
2
3
PCICLK
FRAMEB
STOPB
DEVSELB
PM7367 FREEDM-32P32
FRAME ENGINE AND DATA LINK MANAGER
4
5
6
T
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
1
2
3
4
5
6
PCICLK
FRAMEB
T
TRDYB
STOPB
DEVSELB
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE 291