
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
21
Pin Name
Type
Pin
No.
Function
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-
32P32 desires access to the host memory.
REQB is set high when access is not desired.
REQB is updated on the rising edge of PCICLK.
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-32P32
does not have control over the PCI bus. When
GNTB is set low, the external arbiter has
granted the FREEDM-32P32 control over the
PCI bus. However, the FREEDM-32P32 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
OD
Output
W16
The active low PCI interrupt signal (PCIINTB) is
set low when a FREEDM-32P32 interrupt
source is active, and that source is unmasked.
The FREEDM-32P32 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.