SMSC COM20020 manual Write

Page 21

Table 3 - Write Register Summary

 

 

 

 

WRITE

 

 

 

 

ADDRESS

MSB

 

 

 

 

 

 

LSB

REGISTER

 

 

 

 

 

 

 

 

 

 

00

RI

0

0

0

EXCNAK RECON

NEW

TA

INTERRUPT

NEXTID

MASK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

01

D7

D6

D5

D4

D3

D2

D1

D0

COMMAND

 

 

 

 

 

 

 

 

 

 

02

RDDATA

AUTO-

0

0

0

A10

A9

A8

ADDRESS

INC

PTR HIGH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

03

A7

A6

A5

A4

A3

A2

A1

A0

ADDRESS

PTR LOW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

04

D7

D6

D5

D4

D3

D2

D1

D0

DATA

 

 

 

 

 

 

 

 

 

 

05

0

0

0

0

0

0

0

0

RESERVED

 

 

 

 

 

 

 

 

 

 

06

RESET

CCHEN

TXEN

ET1

ET2

BACK-

SUB-

SUB-

CONFIG-

PLANE

AD1

AD0

URATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TID7

TID6

TID5

TID4

TID3

TID2

TID1

TID0

TENTID

 

 

 

 

 

 

 

 

 

NODEID

 

NID7

NID6

NID5

NID4

NID3

NID2

NID1

NID0

07

 

 

 

 

 

 

 

 

 

P1MODE

FOUR

ET3

RCV_

CKP3

CKP2

CKP1

SLOW

SETUP

 

 

NAKS

ALL

ARB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NEXT ID

 

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

21

Image 21
Contents General Description FeaturesTable of Contents PIN Configuration A1,A2/ALE Description of PIN FunctionsDIP PIN Plcc PIN Name Symbol Description Transmission Media InterfaceMiscellaneous Instead, it must be connected to XTAL1 with COM20020 Operation Protocol Description Network ReconfigurationNetwork Protocol Data RatesExtended Timeout Function Broadcast MessagesResponse Time Idle Time Reconfiguration TimeLine Protocol Invitations To TransmitData Packets AcknowledgementsNegative Acknowledgements System Description MULTIPLEXED, 8051-LIKE BUS Interface with RS-485 Interface Figure C Traditional Hybrid Interface Backplane ConfigurationCOM20020 Network Using RS-485 Differential Transceivers Programmable Txen Polarity Differential Driver ConfigurationInternal Block Diagram Attenuation Functional DescriptionNominal Cable Type Impedance AT 5MHZRead Register Summary Write Interrupt Mask Register IMR Internal RegistersData Register Tentative ID RegisterCommand Register Diagnostic Status RegisterNext ID Register Status RegisterConfiguration Register Setup Register BIT BIT Name Symbol Description Dupid BIT BIT Name Symbol DescriptionData Command Description Address Pointer Low Register Address Pointer High RegisterReset Configuration RegisterCKP3 CKP2 CKP1 Sequential Access Operation Access Speed Sequential Access MemoryInternal RAM Software InterfaceTransmit Sequence Selecting RAM Page SizeRAM Buffer Packet Configuration Page Receive Sequence Transmit Command Chaining Command ChainingReceive Command Chaining Internal Reset Logic Reset DetailsInitialization Sequence Improved DiagnosticsAbnormal Results Normal ResultsOscillator DC Electrical Characteristics Maximum Guaranteed RatingsParameter Symbol MIN TYP MAX Unit Comment Operational DescriptionXTAL1, XTAL2 Input Capacitance Multiplexed BUS, 68XX-LIKE Control Signals Read Cycle Timing DiagramsMultiplexed BUS, 80XX-LIKE Control Signals Read Cycle Multiplexed BUS, 68XX-LIKE Control Signals Write Cycle Multiplexed BUS, 80XX-LIKE Control Signals Write Cycle NON-MULTIPLEXED BUS, 80XX-LIKE Control Signals Read Cycle NON-MULTIPLEXED BUS, 68XX-LIKE Control Signals Read Cycle NON-MULTIPLEXED BUS, 80XX-LIKE Control Signals Write Cycle NON-MULTIPLEXED BUS, 68XX-LIKE Control Signals Write Cycle These signals are to and from the hybrid Normal Mode Transmit or Receive TimingNTXEN NPULSE1 TTL Input Timing on XTAL1 PIN 28-PIN Plcc Package Dimensions 24-PIN DIP Package Dimensions SECTION/FIGURE/ENTRY Correction Revised DateStandard Microsystems Corp