TMC2074-NE SMSC, TMC2074-NE Datasheet - Page 39

• 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

Dual Mode CircLink™ Controller
Datasheet
2.8.2
NOTE:
2.9
SMSC TMC2074
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1 Write Hader
2 Write Data
3 Tramsmit Command
4 Write Data
4 Write Data
4 Write Data
5 repeatedly
TX Control from CPU in Remote Buffer Mode
(MODE REGISTER: TXM = 1)
CircLink can be treated as a simple data buffer so that the system CPU can write data to the CircLink at
any time.
When DID is set to 00h, it becomes the broadcast packet.
(*1)
If the RTO bit is 0 in the mode register, CircLink continues sending packets with a single TX CMD. The TA
bit that represents TX end, continues to be 0 unless RTO is set to 1 (constant TX status).
If the RTO bit is 1, the TA bit returns to 1 after each packet is transmitted, as in Free Format mode. TX
CMD must be issued every time but this does not significantly increase traffic on the network, making it
suitable for applications such as handling sensor information that remains fairly constant.
Receive in Peripheral Mode
CircLink receives all packet data on the network. After receiving a packet without any errors, CircLink
stores the packets in the relevant page in RAM according to the source ID (SID) included in the packet.
Receiving the data packet addressed to the node has four steps: Receiving FBE → Sending ACK →
Receiving PACKET→ Sending ACK. For receiving a data packet addressed to another node in the
network, the packet is stored in the relevant page without sending an ACK.
CPU Side
( ):Not done for broadcast transmission
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DATASHEET
Automatic transmit at
receive of self Token
Keep of TA = 0 (*1)
Page 39
each time of the
Start Transmit
End Transmit
TMC2074/72
repeatedly
TA = 1->0
(NID=n)
(FBE)
PAC
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LAN Side
Token[DID=n]
(ACK)
(ACK)
Token[DID=n+1]
Revision 0.2 (10-23-08)