RELEASED
PM73123 AAL1GATOR-8
DATASHEET
PMC-2000097
ISSUE 2
8 LINK CES/DBCES AAL1 SAR
Pin Name
Type
Pin No.
Function
CSB
Input
W14
The chip select signal (CSB) qualifies
read/write accesses to the AAL1gator-8
device. The CSB signal must be set low
during read and write accesses. When CSB
is set high, the microprocessor interface
signals are ignored by the AAL1gator-8
device.
If CSB is not required (register accesses
controlled only by WRB and RDB) then CSB
should be connected to an inverted version
of the RSTB signal.
Note that if CSB, WRB and RDB are all low,
all chip outputs are tristated.
ACKB
Open-
Drain
Output
AA14
The ACKB is an active low signal which
indicates when processor read data is valid
or when a processor write operation has
completed. When inactive this signal is
tristated.
ACKB is an open drain output and should be
pulled high externally with a fast resistor.
Maximum output current (IMAX) = 6 mA
INTB
Open-
Drain
Output
W15
The interrupt signal (INTB) is an active low
signal indicating that an enabled bit in the
MSTR_INTR_REG 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.
INTB is an open drain output and should be
pulled high externally with a fast resistor.
Maximum output current (IMAX) = 6 mA
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
47
PMC [ PMC-SIERRA, INC ]
