PM7382-PI View Datasheet(PDF) - PMC-Sierra
Part Name
Description
MFG CO.
'PM7382-PI' PDF : 330 Pages View PDF
RELEASED
DATA SHEET
PMC-2010333
ISSUE 3
PM7382 FREEDM-32P256
FRAME ENGINE AND DATA LINK MANAGER 32P256
Pin Name Type Pin
No.
REQB
Tristate H2
Output
GNTB
Input H1
PCIINTB OD
G1
Output
Function
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.
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.
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.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 28
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