PM7367 datasheet(35/323 Pages) PMC

35 / 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

REQB

Output

E17

The active low PCI bus request signal (REQB)

requests an external arbiter for control of the

PCI bus. REQB is set low when the FREEDM-

32P32 desires access to the host memory.

REQB is set high when access is not desired.

REQB is updated on the rising edge of PCICLK.

GNTB

Input

D18

The active low PCI bus grant signal (GNTB)

indicates the granting of control over the PCI in

response to a bus request via the REQB output.

When GNTB is set high, the FREEDM-32P32

does not have control over the PCI bus. When

GNTB is set low, the external arbiter has

granted the FREEDM-32P32 control over the

PCI bus. However, the FREEDM-32P32 will not

proceed until the FRAMEB signal is sampled

high, indicating no current transactions are in

progress.

GNTB is sampled on the rising edge of PCICLK.

PCIINTB

Output

W16

The active low PCI interrupt signal (PCIINTB) is

set low when a FREEDM-32P32 interrupt

source is active, and that source is unmasked.

The FREEDM-32P32 may be enabled to report

many alarms or events via interrupts. PCIINTB

returns high when the interrupt is acknowledged

via an appropriate register access.

PCIINTB is an open drain output and is updated

on the rising edge of PCICLK.

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