COM20020D datasheet(32/72 Pages) SMSC

32 / 72 page

Table 9 - Sub Address Register

BIT

BIT NAME

SYMBOL

DESCRIPTION

7-3

Reserved

These bits are undefined.

2,1,0

Sub Address 2,1,0

SUBAD

2,1,0

These bits determine which register at address 07 may be

accessed. The combinations are as follows:

SUBAD2

SUBAD1 SUBAD0

0 Tentative ID \ (Same

1 Node ID

\ as in

0 Setup 1

/ Config

1 Next ID

/ Register)

0 Setup 2

1 Reserved

0 Reserved

1 Reserved

SUBAD1 and SUBAD0 are exactly the same as exist in the

Configuration Register. SUBAD2 is cleared automatically by

writing the Configuration Register.

Table 10 - Configuration Register

Reset

RESET

A software reset of the COM20020D is executed by writing a

logic "1" to this bit.

A software reset does not reset the

microcontroller interface mode, nor does it affect the

Configuration Register. The only registers that the software

reset affect are the Status Register, the Next ID Register, and

the Diagnostic Status Register.

This bit must be brought

back to logic "0" to release the reset.

Command

Chaining Enable

CCHEN

This bit, if high, enables the Command Chaining operation of

the device. Please refer to the Command Chaining section

for further details. A low level on this bit ensures software

compatibility with previous SMSC ARCNET devices.

Transmit Enable

TXEN

When low, this bit disables transmissions by keeping

nPULSE1, nPULSE2 if in non-Backplane Mode, and nTXEN

pin inactive. When high, it enables the above signals to be

activated during transmissions.

This bit defaults low upon

reset.

This bit is typically enabled once the Node ID is

determined, and never disabled during normal operation.

Please refer to the Improved Diagnostics section for details

on evaluating network activity.

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