PRELIMINARY
PM4318 OCTLIU
DATASHEET
PMC- 2001578
ISSUE 3
OCTAL E1/T1/J1 LINE INTERFACE DEVICE
10
NORMAL MODE REGISTER DESCRIPTION
Normal mode registers are used to configure and monitor the operation of the OCTLIU. Normal
mode registers (as opposed to test mode registers) are selected when A[10] is low.
The Register Memory Map in Table 4 below shows where the normal mode registers are
accessed. The OCTLIU contains 1 set of master configuration, SBI, and CSU registers and 8
sets of T1/E1 LIU registers. Where only 1 set is present, the registers apply to the entire device.
Where 8 sets are present, each set of registers apply to a single octant of the OCTLIU. By
convention, where 8 sets of registers are present, address space 000H – 07FH applies to octant
#1, 080H – 0FFH applies to octant #2, etc, up to 380H – 3FFH for octant #8.
On reset the OCTLIU defaults to T1 mode. For proper operation some register configuration is
expected. By default interrupts will not be enabled, and automatic alarm generation is disabled.
Notes on Normal Mode Register Bits:
1. Writing values into unused register bits has no effect. Reading back unused bits can produce
either a logic 1 or a logic 0; hence, unused register bits should be masked off by software
when read.
2. All configuration bits that can be written into can also be read back. This allows the
processor controlling the OCTLIU to determine the programming state of the chip.
3. Writeable normal mode register bits are cleared to zero upon reset unless otherwise noted.
4. Writing into read-only normal mode register bit locations does not affect OCTLIU operation
unless otherwise noted.
5. Certain register bits are reserved. These bits are associated with functions that are unused in
this application. To ensure that the OCTLIU operates as intended, reserved register bits must
only be written with their default values unless otherwise stated. Similarly, writing to reserved
registers should be avoided unless otherwise stated.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
49
PMC [ PMC-SIERRA, INC ]
