S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
Pin Name Type
Pin
No.
Function
The Read Strobe Bar (RDB) is an active low signal that qualifies
read accesses to the S/UNI-IMA-4 device. When the CSB is set low,
the S/UNI-IMA-4 device drives the D[15:0] bus with the contents of
the addressed register on the falling edge of RDB.
RDB
Input
A9
The Chip Select Bar (CSB) is an active low signal that qualifies
read/write accesses to the S/UNI-IMA-4 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-4 device.
CSB
Input
B9
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.
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.
INTB
Open-
Drain
C9
Output
9.6 SDRAM I/F (35 Signals)
Pin Name Type
Pin
Function
No.
The Cell Buffer SDRAM Chip Select Bar (CBCSB) is an active low
CBCSB
Output AB6
Output AB7
Output W6
Output Y8
signal used to control the SDRAM.
CBCSB, CBRASB, CBCASB, and CBWEB define the command
being sent to the SDRAM.
The CBCSB output is updated on the rising edge of SYSCLK.
The Cell Buffer SDRAM Row Address Strobe Bar (CBRASB) is
CBRASB
CBCASB
CBWEB
an active low signal used to control the SDRAM.
CBCSB, CBRASB, CBCASB, and CBWEB define the command
being sent to the SDRAM.
The CBRASB output is updated on the rising edge of SYSCLK.
The Cell Buffer SDRAM Column Address Strobe Bar (CBCASB)
is an active low signal used to control the SDRAM.
CBCSB, CBRASB, CBCASB, and CBWEB define the command
being sent to the SDRAM.
The CBCASB output is updated on the rising edge of SYSCLK.
The Cell Buffer SDRAM Write Enable Bar (CBWEB) is an active
low signal used to control the SDRAM.
CBCSB, CBRASB, CBCASB, and CBWEB define the command
being sent to the SDRAM.
The CBWEB output is updated on the rising edge of SYSCLK.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
36
PMC [ PMC-SIERRA, INC ]
