TMC2072 datasheet(39/106 Pages) SMSC

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Peripheral Mode CircLink™ Controller

Datasheet

SMSC TMC2072

Page 39

Revision 0.1 (01-30-06)

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.

(N ID = n)

CP U S ide

T M C2074/72

LA N S ide

1 W rite A ddress

2 W rite D ata

3 T ransmit C ommand

T A = 1-> 0

……

…

……

…

S tart T ransm it

T oken[D ID = n]

(F BE)

(A C K )

PAC

End Transm it

(A C K )

K eep of T A = 0 (*1)

T oken[D ID = n+ 1]

……

…

4 W rite D ata

……

…

5 repeatedly

repeatedly

( ): N ot done for broadcasts

A utom atic transm it at

each tim e of the receive

of self T oken

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 packet 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.

As described above, CircLink constantly receives packets, with one exception: It abandons the received

packets when the receive mode of the corresponding page is Free Format mode and the receive flag is set

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