PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
Pin Name
Type
Pin
No.
Function
WRB
Input
Input
Input
D9
A9
B9
The Write Strobe Bar (WRB) is an active low signal
that qualifies write accesses to the S/UNI-IMA-8
device. When the CSB is set low, the D[15:0] bus
contents are clocked into the addressed register on
the rising edge of WRB.
The Read Strobe Bar (RDB) is an active low signal
that qualifies read accesses to the S/UNI-IMA-8
device. When the CSB is set low, the S/UNI-IMA-8
device drives the D[15:0] bus with the contents of the
addressed register on the falling edge of RDB.
The Chip Select Bar (CSB) is an active low signal
that qualifies read/write accesses to the S/UNI-IMA-8
device. The CSB signal must be set low during read
and write accesses. When the CSB is set high, the
microprocessor-interface signals are ignored by the
S/UNI-IMA-8 device.
RDB
CSB
If the CSB is not required (register accesses are
controlled only by WRB and RDB), then it should be
connected to an inverted version of the RSTB signal.
INTB
Open- C9
Drain
The Interrupt Bar (INTB) is an active low signal
indicating that an enabled bit in the Master Interrupt
Register was set. When INTB is set low, the interrupt
is active and enabled. When INTB is tristate, there is
no interrupt pending or it is disabled.
Output
INTB is an open drain output and should be pulled
high externally with a fast resistor.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
27
PMC [ PMC-SIERRA, INC ]
