PM7382-PI datasheet(39/330 Pages) PMC

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PM7382 FREEDM-32P256

DATA SHEET

PMC-2010333

ISSUE 3

FRAME ENGINE AND DATA LINK MANAGER 32P256

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

Pin Name Type

No.

Function

REQB

Tristate

Output

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-

32P256 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

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-32P256

does not have control over the PCI bus. When

GNTB is set low, the external arbiter has granted

the FREEDM-32P256 control over the PCI bus.

However, the FREEDM-32P256 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

The active low PCI interrupt signal (PCIINTB) is

set low when a FREEDM-32P256 interrupt

source is active, and that source is unmasked.

The FREEDM-32P256 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

asynchronous to PCICLK.

PM7382-PI Datasheet(PDF) 39 Page - PMC-Sierra, Inc

PM7382-PI Datasheet(HTML) 39 Page - PMC-Sierra, Inc

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