TMC2074 datasheet(39/116 Pages) SMSC

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Dual Mode CircLink™ Controller

Datasheet

SMSC TMC2074

Page 39

Revision 0.1 (03-29-06)

DATASHEET

2.8.2

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.

(NID=n)

CPU Side

TMC2074/72

LAN Side

1 Write Hader

2 Write Data

3 Tramsmit Command

TA = 1->0

……

…

……

…

Start Transmit

Token[DID=n]

(FBE)

(ACK)

PAC

End Transmit

(ACK)

Keep of TA = 0 (*1)

Token[DID=n+1]

……

…

4 Write Data

……

…

5 repeatedly

repeatedly

( ):Not done for broadcast transmission

Automatic transmit at

each time of the

receive of self Token

NOTE:

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.

2.9

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.

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