PM7366-PI datasheet(34/286 Pages) PMC

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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

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-8 is the initiator, DEVSELB is an

input. If no target responds to an address in six

PCICLK cycles, the FREEDM-8 will abort the current

transaction and alerts the PCI Host via an interrupt.

When the FREEDM-8 is the target, DEVSELB is an

output. DELSELB is set low when the address on

AD[31:0] is recognised.

When the FREEDM-8 is not involved in the current

transaction, DEVSELB is tri-stated.

FREEDM-8 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-8 is the target, an initiator is locking the

FREEDM-8 as an "owned" target. Under these

circumstances, the FREEDM-8 will reject all

transaction with other initiators. The FREEDM-8 will

continue to reject other initiators until its owner

releases the lock by forcing both FRAMEB and

LOCKB high. As a initiator, the FREEDM-8 will never

lock a target.

LOCKB is sampled using the rising edge of PCICLK.

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-8 desires access

to the host memory. REQB is set high when access

is not desired.

REQB is updated on the rising edge of PCICLK.

PM7366-PI Datasheet(PDF) 34 Page - PMC-Sierra, Inc

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