Zilog Z16C30 Manual de usuario descargar pdf (Pagina 184)

8-29

Z16C30 USC

USER'S MANUAL

ZILOG

UM97USC0100

RxDecode

Receive Mode Register (RMR) Register Address 0 b 10001

RxPar

Enab

RxCRCType

RxCRC

Start

RxCRC

Enab

QAbort

RxParType

RxLength RxEnable

14 13 12 11 10 9 8 7 6 5 4 3 2 1 015

Receive Sync Register (RSR) Register Address 0 b 10100

Bit(s)

Field/Bit

Name

Conditions

/Context

Description

Status

Ref Chapter: Section

RSR15-8

Receive Sync, SYN1, or 9th-16th bits of Ethernet address Receive SYN0 or 1st-8th bits of address

Receive Sync match character WR 5: Monosync and Bisync Modes

Monosync

second half of Receive sync match (SYN1)Bisync

match against last-received 8 bits of address802.3

RSR7-0 first half of Receive sync match (SYN0) 5: Monosync and Bisync ModesBisync

match against first-received 8 bits of addressH/SDLC,

(CMR7-4)

not xx00,

or 802.3

5: 802.3 (Ethernet) Mode

5: HDLC/SDLC Mode

5: 802.3 (Ethernet) Mode

Bit(s)

Field/Bit

Name

Conditions

/Context

Description

Status

Ref Chapter: Section

RMR15-13 RxDecode 000=RxD not encoded ("NRZ");

001=invert polarity of RxD ("NRZB");

010=decode RxD NRZI-Mark;

011=decode RxD NRZI-Space;

100=decode RxD Biphase-Mark (FM1);

101=decode RxD Biphase-Space (FM0);

110=decode RxD Biphase-Level (Manchester);

111=decode RxD Differential Biphase-Level

RW 4: Data Formats and

Encoding

RMR12-11

RxCRCType

00=use 16-bit CRC-CCITT for Rx;

01=use CRC-16 for Rx;

10=use 32-bit Ethernet CRC for Rx

5: Cyclic Redundancy

Checking

Sync

RMR10

RxCRCStart

0=start Receive CRC generator as all-zeros;

1=all ones

Sync

RMR9

RxCRCEnab

1=include Receive characters in CRCSync

RMR8 QAbort 0=use Abort/PE bit in RxFIFO, RCSR2 for

Abort indication; 0=use it for Parity Error indication

5: Status Reporting: Detailed

Status in RCSR

5: HDLC/SDLC: Handling a

Received Abort

HDLC/

SDLC

RMR7-6 RxParType 00=Receive Parity Even; 01=Odd;

10=Zero (Space); 11=One (Mark)

5: Parity Checking

RMR5 RxParEnab 1=accumulate and check Parity bits

RMR4-2 RxLength 000=receive eight bit characters;

001-111=receive 1-7 bit characters

5: The Mode Registers:

Character Length

RMR1-0 RxEnable 00=disable Receiver (immediately);

01=disable Rx at end of message/frame/char;

10=enable Rx unconditionally;

11=auto-enable Rx per /DCD pin

14 13 12 11 10 9 8 7 6 5 4 3 2 1 015

RW = Read/Write, RO = Read Only, WO = Write Only – for other codes see p. 8-10.

UM009402-0201

1 2 ... 179 180 181 182 183 184 185 186 187 188 189 ... 207 208

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Zilog Z16C30 Manual de usuario Pagina 184

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