COM90C66 Datasheet, PDF (24/76 Pages) SMSC Corporation – ARCNET Controller/Transceiver with AT Interface and On-Chip RAM

Table 6 - Diagnostic Status Register
BIT
BIT NAME
SYMBOL
DESCRIPTION
7 My Reconfiguration MY-
This bit, if high, indicates that the reconfiguration that has just
RECON occurred was caused by this node. This bit is set when the
Token Reception Timer times out. This bit is typically read
after the RECON bit of the Status Register is found to be set.
Refer to the Improved Diagnostics section of this document
for further details.
5 Receive Activity
RCVACT
This bit, if high, indicates that receive activity (data transition)
is detected on the RXIN pin of the device. This bit may be
used in diagnostic troubleshooting of the network or node.
Refer to the Improved Diagnostics section of this document
for further details.
4 Token Seen
TOKEN
This bit, if high, indicates that a token has been seen on the
network, sent by a node other than this node. This bit may
be used in diagnostic troubleshooting of the network or node.
Refer to the Improved Diagnostics section of this document
for further details.
6, (not used)
3-0
These bits are undefined.
Table 7 - Command Register
WRITTEN DATA COMMAND NAME
DESCRIPTION
0000 0000
CLEAR TRANSMIT
INTERRUPT
This command is only used in the Command Chaining
operation. Please refer to the Command Chaining
section of this document for definition of this command.
0000 0001
DISABLE
TRANSMITTER
This command will cancel any pending transmit
command (transmission that has not yet started) and will
set the TA (Transmitter Available) status bit to logic "1"
when the COM90C66 next receives the token.
0000 0010
DISABLE
RECEIVER
This command will cancel any pending receive
command. If the COM90C66 is not yet receiving a
packet, the RI (Receiver Inhibited) bit will be set to logic
"1" the next time the token is received. If packet reception
is already underway, reception will run to its normal
conclusion.
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