![](http://datasheet.mmic.net.cn/330000/PM7367-PI_datasheet_16444408/PM7367-PI_33.png)
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
19
Pin Name
Type
Pin
No.
Function
STOPB
I/O
L20
The active low stop signal (STOPB) requests
the initiator to stop the current bus transaction.
When STOPB is set high by a target, the
initiator continues with the transaction. When
STOPB is set low, the initiator will stop the
current transaction.
When the FREEDM-32P32 is the initiator,
STOPB is an input. When STOPB is sampled
low, the FREEDM-32P32 will terminate the
current transaction in the next PCICLK cycle.
When the FREEDM-32P32 is the target,
STOPB is an output. The FREEDM-32P32 only
issues transaction stop requests when
responding to reads and writes to configuration
space (disconnecting after 1 DWORD
transferred) or if an initiator introduces wait
states during a transaction.
When the FREEDM-32P32 is not involved in
the current transaction, STOPB is tri-stated.
STOPB 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.
IDSEL
Input
F20
The initialization device select signal (IDSEL)
enables read and write access to the PCI
configuration registers. When IDSEL is set high
during the address phase of a transaction and
the C/BEB[3:0] code indicates a register read or
write, the FREEDM-32P32 performs a PCI
configuration register transaction and asserts
the DEVSELB signal in the next PCICLK period.
IDSEL is sampled on the rising edge of
PCICLK.