PMC-Sierra, Inc.
PM5356
S/UNI-622-MAX
DATASHEET
S/UNI-622-MAX
PMC-1980589
ISSUE 5
SATURN USER NETWORK INTERFACE (622-MAX)
11 NORMAL MODE REGISTER DESCRIPTION
Normal mode registers are used to configure and monitor the operation of the S/UNI-622-MAX.
Normal mode registers (as opposed to test mode registers) are selected when TRS (A[8]) is low.
Notes on Normal Mode Register Bits:
1. Writing values into unused register bits has no effect. However, to ensure software
compatibility with future, feature-enhanced versions of the product, unused register bits must
be written with logic zero. Reading back unused bits can produce either a logic one or a logic
zero; 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 S/UNI-622-MAX to determine the programming state of the block.
3. Writable normal mode register bits are cleared to logic zero upon reset unless otherwise
noted.
4. Writing into read-only normal mode register bit locations does not affect S/UNI-622-MAX
operation unless otherwise noted. Performance monitoring counter registers are a common
exception.
5. Certain register bits are reserved. These bits are associated with megacell functions that are
unused in this application. To ensure that the S/UNI-622-MAX operates as intended,
reserved register bits must be written with their default value as indicated by the register bit
description.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
66
PMC [ PMC-SIERRA, INC ]
