RELEASED
PM7380 FREEDM-32P672
DATA SHEET
PMC-1990262
ISSUE 5
FRAME ENGINE AND DATA LINK MANAGER 32P672
Pin Name Type
Pin
Function
No.
REQB
GNTB
Tristate 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-
32P672 desires access to the host memory.
REQB is set high when access is not desired.
Output
REQB is updated on the rising edge of PCICLK.
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-32P672
does not have control over the PCI bus. When
GNTB is set low, the external arbiter has
granted the FREEDM-32P672 control over the
PCI bus. However, the FREEDM-32P672 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
G1
The active low PCI interrupt signal (PCIINTB) is
set low when a FREEDM-32P672 interrupt
source is active, and that source is unmasked.
The FREEDM-32P672 may be enabled to
report many alarms or events via interrupts.
PCIINTB returns high when the interrupt is
acknowledged via an appropriate register
access.
Output
PCIINTB is an open drain output and is
asynchronous to PCICLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
30
PMC [ PMC-SIERRA, INC ]
