RELEASED
PM7366 FREEDM-8
DATA SHEET
PMC-1970930
ISSUE 4
FRAME ENGINE AND DATA LINK MANAGER
Pin Name
Type
Pin No.
Function
-PI
-BI
STOPB
I/O
L20
L3
The active low stop signal (STOPB) requests the
initiator to stop the current bus transaction. When
STOPB is set high by a target, the initiator continues
with the transaction. When STOPB is set low, the
initiator will stop the current transaction.
When the FREEDM-8 is the initiator, STOPB is an
input. When STOPB is sampled low, the FREEDM-8
will terminate the current transaction in the next
PCICLK cycle.
When the FREEDM-8 is the target, STOPB is an
output. The FREEDM-8 only issues transaction stop
requests when responding to reads and writes to
configuration space (disconnecting after 1 DWORD
transferred) or if an initiator introduces wait states
during a transaction.
When the FREEDM-8 is not involved in the current
transaction, STOPB is tri-stated.
STOPB is updated on the rising edge of PCICLK or
sampled on the rising edge of PCICLK depending on
whether it is an output or an input.
IDSEL
Input
F20
G3
The initialization device select signal (IDSEL) enables
read and write access to the PCI configuration
registers. When IDSEL is set high during the address
phase of a transaction and the C/BEB[3:0] code
indicates a register read or write, the FREEDM-8
performs a PCI configuration register transaction and
asserts the DEVSELB signal in the next PCICLK
period.
IDSEL is sampled on the rising edge of PCICLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
20
PMC [ PMC-SIERRA, INC ]
