TMC2074-NE SMSC, TMC2074-NE Datasheet - Page 72

• Manufacturer Part Number: TMC2074-NE
• Description: Network Controller & Processor ICs Standalone Mode CircLink Cntlr
• Manufacturer: SMSC

Specifications of TMC2074-NE

• Product: Controller Area Network (CAN)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.2.2
Revision 0.2 (10-23-08)
COMR1 Register: Diagnostic/Command Register
*1 Not equivalent to the ARCNET original specifications.
- When reading: ARCNET diagnostic register
MY-RECON (bit 7)
When this bit is 1, it indicates that the local reconfiguration timer has timed out. This timeout sends a
reconfiguration burst signal. It is read after an interrupt has been generated by setting RECON bit = 1.
(RECON bit = 1 is set after MY-RECON bit is set to 1.) The bit is cleared when read or by software reset.
DUPID (bit 6)
When this bit is 1 in the offline state (TXEN = 0), it indicates that a duplicate node ID exists on the network.
In this state, the network cannot be accessed (TXEN = 1). Check that all the node ID settings are correct.
In the online state (TXEN = 1), DUPID is set to 1 every time a token addressed to it is received**. This bit
is cleared when read or by software reset.
** Disregard this first setting of DUPID=0 -> 1. The second setting indicates a token addressed to its own
CircLink.
RCVACT (bit 5)
When this bit is 1, it indicates that activity has been detected at the CircLink receive input. This bit is
cleared when read or by software reset.
TOKEN (bit 4)
When this bit is 1, it indicates that a token signal on the network has been detected. Note that the token
signal sent by this bit cannot be detected. This bit is cleared when read or by software reset.
*1
COMR1
[READ]
COMR1
[WRITE]
15-8
15-8
7-0
bit
bit
7
6
5
4
3
2
1
0
(Diagnostic Register)
name
--------
MY-RECON
DUPID
RCVACT
TOKEN
EXCNAK
TENTID
NXTIDERR
--------
(Command Register)
name
--------
D7-0
DATASHEET
init. value
init. value
--
--
0
0
0
0
0
0
0
0
0
Page 72
Description
reserved (all "0")
My Reconfiguration
Duplicate ID
Receive Activity
Token Seen
Excessive NAK
Tentative ID
New Next ID
Reserved
Description
Reserved (all "0")
D7-0
Dual Mode CircLink™ Controller
address:02h
address:02h
SMSC TMC2074
Datasheet