DP83255AVF datasheet(53/96 Pages) NSC

53 / 96 page

50 Registers (Continued)

RECEIVE CONDITION COMPARISON REGISTER A (RCCRA)

The Receive Condition Comparison Register A ensures that the Control Bus must first read a bit modified by the PLAYER device

before it can be written to by the Control Bus Interface

The current state of RCRA is automatically written into the Receive Condition Comparison Register A (ie RCCRA e RCRA)

during a Control Bus Interface read-cycle of RCRA

During a Control Bus Interface write-cycle the PLAYER device will set the Conditional Write Inhibit bit (CWI) of the Interrupt

Condition Register (ICR) to 1 and prevent the setting or clearing of a bit within RCRA when the value of a bit in RCRA differs

from the value of the corresponding bit in the Receive Condition Comparison Register A

ACCESS RULES

ADDRESS

READ

WRITE

1Ch

Always

LSUPIC

LSCC

NTC

NLSC

MLSC

HLSC

QLSC

NSDC

Bit

Symbol

Description

NSDC

NO SIGNAL DETECT COMPARISON

The comparison bit for the No Signal Detect bit

(NSD) of the Receive Condition Register A (RCRA)

QLSC

QUIET LINE STATE COMPARISON

The comparison bit for the Quiet Line State bit

(QLS) of the Receive Condition Register A (RCRA)

HLSC

HALT LINE STATE COMPARISON

The comparison bit for the Halt Line State bit (HLS)

of the Receive Condition Register A (RCRA)

MLSC

MASTER LINE STATE COMPARISON

The comparison bit for the Master Line State bit

(MLS) of the Receive Condition Register A (RCRA)

NLSC

NOISE LINE STATE COMPARISON

The comparison bit for the Noise Line State bit

(NLS) of the Receive Condition Register A (RCRA)

NTC

NOISE THRESHOLD COMPARISON

The comparison bit for the Noise Threshold bit

(NT) of the Receive Condition Register A (RCRA)

LSCC

LINE STATE CHANGE COMPARISON

The comparison bit for the Line State Change

bit (LSC) of the Receive Condition Register A (RCRA)

LSUPIC

LINE STATE UNKNOWN

PHY INVALID COMPARISON

The comparison bit for the

Line State Unknown

PHY Invalid bit (LSUPI) of the Receive Condition Register A

(RCRA)

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