
RELEASED
DATA SHEET
PM7382 FREEDM-32P256
ISSUE 3
PMC-2010333
FRAME ENGINE AND DATA LINK MANAGER 32P256
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
28
Pin Name Type
Pin
No.
Function
REQB
Tristate
Output
H2
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-
32P256 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
H1
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-32P256
does not have control over the PCI bus. When
GNTB is set low, the external arbiter has granted
the FREEDM-32P256 control over the PCI bus.
However, the FREEDM-32P256 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
G1
The active low PCI interrupt signal (PCIINTB) is
set low when a FREEDM-32P256 interrupt
source is active, and that source is unmasked.
The FREEDM-32P256 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
asynchronous to PCICLK.