PM7344 datasheet(124/293 Pages) PMC

124 / 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

108

Registers 01BH, 11BH, 21BH and 31BH: DJAT Configuration

Bit

Type

Function

Default

Bit 7

Unused

Bit 6

Unused

Bit 5

R/W

Reserved

Bit 4

R/W

CENT

Bit 3

R/W

UNDE

Bit 2

R/W

OVRE

Bit 1

R/W

SYNC

Bit 0

R/W

LIMIT

These registers control the operation of the DJAT FIFO read and write pointers

and controls the generation of interrupt by the FIFO status.

Reserved:

This bit should be set to logic 1 for proper operation.

CENT:

The CENT bit allows the FIFO to self-center its read pointer, maintaining the

pointer at least 4 UI away from the FIFO being empty or full. When CENT is

set to logic 1, the FIFO is enabled to self-center for the next 384 transmit data

bit period, and for the first 384 bit periods following an overrun or underrun

event. If an EMPTY or FULL alarm occurs during this 384 UI period, then the

period will be extended by the number of UI that the EMPTY or FULL alarm

persists. During the EMPTY or FULL alarm conditions, data is lost. When

CENT is set to logic 0, the self-centering function is disabled, allowing the

data to pass through uncorrupted during EMPTY or FULL alarm conditions.

The CENT bit can only be set to logic 1 if the SYNC bit in this register is set to

logic 0.

OVRE,UNDE:

The OVRE and UNDE bits control the generation of an interrupt on the

microprocessor INTB pin when a FIFO error event occurs. When OVRE or

UNDE is set to logic 1, an overrun event or underrun event, respectively, is

allowed to generate an interrupt on the INTB pin. When OVRE or UNDE is

set to logic 0, the FIFO error events are disabled from generating an interrupt.

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