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DATA SHEET
PM7367 FREEDM-32P32
ISSUE 2
PMC-1991499
FRAME ENGINE AND DATA LINK MANAGER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE
20
Pin Name
Type
Pin
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.