PM7366-PI datasheet(35/286 Pages) PMC

35 / 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

Pin No.

Pin Name

Type

-PI

-BI

Function

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-8 does not have control over the

PCI bus. When GNTB is set low, the external arbiter

has granted the FREEDM-8 control over the PCI bus.

However, the FREEDM-8 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-8 interrupt source is active, and

that source is unmasked. The FREEDM-8 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.

PERRB

I/O

L19

The active low parity error signal (PERRB) indicates a

parity error over the AD[31:0] and C/BEB[3:0] buses.

Parity error is signalled when even parity calculations

do not match the PAR signal. PERRB is set low at

the cycle immediately following an offending PAR

cycle. PERRB is set high when no parity error is

detected.

PERRB is enabled by setting the PERREN bit in the

Control/Status register in the PCI Configuration

registers space. Regardless of the setting of

PERREN, parity errors are always reported by the

PERR bit in the Control/Status register in the PCI

Configuration registers space.

PERRB is updated on the rising edge of PCICLK.

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