PRELIMINARY
PM4318 OCTLIU
DATASHEET
PMC- 2001578
ISSUE 3
OCTAL E1/T1/J1 LINE INTERFACE DEVICE
Pin Name
Type
Pin
No.
Function
Microprocessor Interface
A[0]/LEN1[0]
A[1]/LEN1[1]
A[2]/LEN1[2]
A[3]/LEN2[0]
A[4]/LEN2[1]
A[5]/LEN2[2]
A[6]/LEN3[0]
A[7]/LEN3[1]
A[8]/LEN3[2]
A[9]/LEN4[0]
A[10]/LEN4[1]
Input
E22
E21
E20
F19
D22
D21
D20
E19
C22
C21
C20
Address Bus (A[10:0]). This bus selects specific registers during
OCTLIU register accesses.
Signal A[10] selects between normal mode and test mode register
access. A[10] has an internal pull down resistor.
A[10:0] share the same pins as some of the LENx[2:0] inputs.
A[10:0] are selected when HW_ONLY is tied low.
ALE/LEN4[2]
Input
A22
Address Latch Enable (ALE). This signal is active high and
latches the address bus contents, A[10:0], when low. When ALE
is high, the internal address latches are transparent. ALE allows
the OCTLIU to interface to a multiplexed address/data bus. The
ALE input has an internal pull up resistor.
ALE shares the same pin as the LEN4[2] input. ALE is selected
when HW_ONLY is tied low.
WRB/LEN5[0]
RDB/LEN5[1]
CSB/LEN5[2]
Input
Input
Input
D18
C19
B20
Active Low Write Strobe (WRB). This signal is low during a
OCTLIU register write access. The D[7:0] bus contents are
clocked into the addressed register on the rising WRB edge while
CSB is low.
WRB shares the same pin as the LEN5[0] input. WRB is selected
when HW_ONLY is tied low.
Active Low Read Enable (RDB). This signal is low during
OCTLIU register read accesses. The OCTLIU drives the D[7:0]
bus with the contents of the addressed register while RDB and
CSB are low.
RDB shares the same pin as the LEN5[1] input. RDB is selected
when HW_ONLY is tied low.
Active Low Chip Select (CSB). CSB must be low to enable
OCTLIU register accesses. CSB must go high at least once after
power up to clear internal test modes. If CSB is not used, it
should be tied to an inverted version of RSTB, in which case,
RDB and WRB determine register accesses.
CSB shares the same pin as the LEN5[2] input. CSB is selected
when HW_ONLY is tied low.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
24
PMC [ PMC-SIERRA, INC ]
