
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
15
Pin Name
Type
Pin
No.
Function
AD[31]
I/O
D19
As an output bus, AD[31:0] is updated on the
rising edge of PCICLK. As an input bus,
AD[31:0] is sampled on the rising edge of
PCICLK.
C/BEB[0]
C/BEB[1]
C/BEB[2]
C/BEB[3]
I/O
R19
M18
J20
G18
The PCI bus command and byte enable bus
(C/BEB[3:0]) contains the bus command or the
byte valid indications. During the first clock
cycle of a transaction, C/BEB[3:0] contains the
bus command code. For subsequent clock
cycles, C/BEB[3:0] identifies which bytes on the
AD[31:0] bus carry valid data. C/BEB[3] is
associated with byte 3 (AD[31:24]) while
C/BEB[0] is associated with byte 0 (AD[7:0]).
When C/BEB[n] is set high, the associated byte
is invalid. When C/BEB[n] is set low, the
associated byte is valid.
When the FREEDM-32P32 is the initiator,
C/BEB[3:0] is an output bus.
When the FREEDM-32P32 is the target,
C/BEB[3:0] is an input bus.
When the FREEDM-32P32 is not involved in
the current transaction, C/BEB[3:0] is tri-stated.
As an output bus, C/BEB[3:0] is updated on the
rising edge of PCICLK. As an input bus,
C/BEB[3:0] is sampled on the rising edge of
PCICLK.