PM7344 datasheet(142/293 Pages) PMC

142 / 293 page

PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

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

126

Registers 028H, 128H, 228H and 328H: E1-FRMR International/National Bits

Bit

Type

Function

Default

Bit 7

Si[1]

Bit 6

Si[0]

Bit 5

RAWRA

Bit 4

Sn[4]

Bit 3

Sn[5]

Bit 2

Sn[6]

Bit 1

Sn[7]

Bit 0

Sn[8]

Reading this register returns the current bit value of the International and

National bits collected over 2 consecutive frames. The Si[1] bit position

corresponds to the value contained in the International bit position in the FAS

frame; the Si[0], RAWRA, and Sn[4:8] bit positions correspond to the values

contained in the International, Remote Alarm Indication, and National bit

positions in the NFAS frame. This register is updated after time slot 0 of every

NFAS frame and the contents are valid for 2 frames (250µs). The contents of this

considered to constitute a byte value (i.e. the 5 national bits should not be

considered as indicating 1 of 32 possible values since it is possible that the

individual bits are not all from the same time instant due to the asynchronous

nature of the microprocessor reads). If the bits are to be interpreted as binary

values, care should be taken to ensure a coherent set of bit values by reading

the register at least twice.

The Si0, RAWRA and Sn[4:8] bits map to the timeslot 0 NFAS as follows:

Bit Position

567

Si[0]

RAWRA

Sn[4]

Sn[5]

Sn[6]

Sn[7]

Sn[8]

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