COM20022I_06 datasheet(38/82 Pages) SMSC

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10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Board RAM

Datasheet

Revision 02-27-06

Page 38

SMSC COM20022I

DATASHEET

Table 6.4 - Diagnostic Status Register

BIT

BIT NAME

SYMBOL

DESCRIPTION

My Reconfiguration MY-

RECON

This bit, if high, indicates that a past reconfiguration was caused by this

node. It is set when the Lost Token Timer times out, and should be

typically read following an interrupt caused by RECON. Refer to the

Improved Diagnostics section for further detail.

Duplicate ID

DUPID

This bit, if high, indicates that the value in the Node ID Register matches

both Destination ID characters of the token and a response to this token

has occurred. Trailing zero's are also verified. A logic "1" on this bit

indicates a duplicate Node ID, thus the user should write a new value into

the Node ID Register. This bit is only useful for duplicate ID detection

when the device is off line, that is, when the transmitter is disabled. When

the device is on line this bit will be set every time the device gets the

token. This bit is reset automatically upon reading the Diagnostic Status

Receive

Activity

RCVACT

This bit, if high, indicates that data activity (logic "1") was detected on the

RXIN pin of the device. Refer to the Improved Diagnostics section for

further detail.

Token Seen

TOKEN

This bit, if high, indicates that a token has been seen on the network, sent

by a node other than this one. Refer to the Improved Diagnostic section

for further detail.

Excessive NAK

EXCNAK

This bit, if high, indicates that either 128 or 4 Negative Acknowledgements

have occurred in response to the Free Buffer Enquiry. This bit is cleared

upon the "POR Clear Flags" command. Reading the Diagnostic Status

if the corresponding bit in the IMR is also set. Refer to the Improved

Diagnostics section for further detail.

Tentative ID

TENTID

This bit, if high, indicates that a response to a token whose DID matches

the value in the Tentative ID Register has occurred. The second DID and

the trailing zero's are not checked. Since each node sees every token

passed around the network, this feature can be used with the device on-

line in order to build and update a network map. Refer to the Improved

Diagnostics section for further detail.

New Next ID

NEW

NXTID

This bit, if high, indicates that the Next ID Register has been updated and

that a node has either joined or left the network. Reading the Diagnostic

Status Register does not clear this bit. This bit, when set, will cause an

interrupt if the corresponding bit in the IMR is also set. The bit is cleared

by reading the Next ID Register.

1,0

(Reserved)

These bits are undefined.

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