PM7346 datasheet(109/419 Pages) PMC

109 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 88

NORMAL MODE REGISTER DESCRIPTION

Normal mode registers are used to configure and monitor the operation of the

S/UNI-QJET. Normal mode registers (as opposed to test mode registers) are

selected when A[10] 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-QJET 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-QJET operation unless otherwise noted.

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-QJET

operates as intended, reserved register bits must only be written with the

suggested logic levels. Similarly, writing to reserved registers should be

avoided.

6. The S/UNI-QJET requires a software initialization sequence in order to

guarantee proper device operation and long term reliability. Please refer to

Section 12.1 of this document for the details on how to program this

sequence.

PM7346 Datasheet(PDF) 109 Page - PMC-Sierra, Inc