PM7367 datasheet(34/323 Pages) PMC

34 / 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

DEVSELB

I/O

K20

The active low device select signal (DEVSELB)

indicates that a target claims the current bus

transaction. During the address phase of a

transaction, all targets decode the address on

the AD[31:0] bus. When a target, recognizes

the address as its own, it sets DEVSELB low to

indicate to the initiator that the address is valid.

If no target claims the address in six bus clock

cycles, the initiator assumes that the target

does not exist or cannot respond and aborts the

transaction.

When the FREEDM-32P32 is the initiator,

DEVSELB is an input. If no target responds to

an address in six PCICLK cycles, the FREEDM-

32P32 will abort the current transaction and

alerts the PCI Host via an interrupt.

When the FREEDM-32P32 is the target,

DEVSELB is an output. DELSELB is set low

when the address on AD[31:0] is recognised.

When the FREEDM-32P32 is not involved in

the current transaction, DEVSELB is tri-stated.

FREEDM-32P32 is updated on the rising edge

of PCICLK or sampled on the rising edge of

PCICLK depending on whether it is an output or

an input.

LOCKB

Input

L18

The active low bus lock signal (LOCKB) locks a

target device. When LOCKB and FRAME are

set low, and the FREEDM-32P32 is the target,

an initiator is locking the FREEDM-32P32 as an

"owned" target. Under these circumstances,

the FREEDM-32P32 will reject all transaction

with other initiators. The FREEDM-32P32 will

continue to reject other initiators until its owner

releases the lock by forcing both FRAMEB and

LOCKB high. As a initiator, the FREEDM-

32P32 will never lock a target.

LOCKB is sampled using the rising edge of

PCICLK.

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