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S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

Document ID: PMC-1990267, Issue 3

Normal Mode Register Description

Normal mode registers are used to configure and monitor the operation of the S/UNI-JET .

Normal mode registers (as opposed to test mode registers) are selected when A[10] is low.

Notes on Normal Mode Register Bits:

• 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.

• All configuration bits that can be written into can also be read back. This allows the processor

controlling the S/UNI-JET to determine the programming state of the block.

• Writable normal mode register bits are cleared to logic zero upon reset unless otherwise

noted.

• Writing into read-only normal mode register bit locations does not affect S/UNI-JET

operation unless otherwise noted.

• Certain register bits are reserved. These bits are associated with megacell functions that are

unused in this application. To ensure that the S/UNI-JET operates as intended, reserved

reserved registers should be avoided.

• The S/UNI-JET requires a software initialization sequence in order to guarantee proper

device operation and long term reliability. Please refer to Section 13.1 of this document for

the details on how to program this sequence.

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