TMC2072-MT SMSC, TMC2072-MT Datasheet - Page 36

• Manufacturer Part Number: TMC2072-MT
• Description: IC CTRLR CIRC 100-TQFP DUAL MODE
• Manufacturer: SMSC
• Series: CircLink™r

Specifications of TMC2072-MT

• Controller Type: I/O Controller
• Interface: Transceiver
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 40mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1023

2.7.2
Revision 0.1 (06-07-07)
Standalone mode
In Standalone mode CircLink independently executes send and receive sequences without a CPU.
However, TMC2072 can not use standalone mode because it does not support standalone mode.
Communication Mode
Free-format mode
Free format mode is retained from the original ARCNET specification. This mode is not optimal for real-
time performance but is useful for transferring large amounts of data at once. CPU controls a series of
sequence such as "Packet preparation → Issuing TX command → Interruption handling after the end of
TX" at sender and "Receive command issuing → Interrupt handling after the end of RX→ Packet read" at
receiver.
Since CircLink initiates the actual TX upon receipt of a token addressed to the node, the time between a
TX command being issued and TX starting varies depending on the line status. The free format mode is a
"packet-oriented" transfer mode that assumes a completion of packet preparation before issuing a TX
CMD, so its real-time performance is not as high as that of the remote buffer mode “token-oriented” mode.
On the other hand, the free format mode has no limitation on the packet data structure, and it can handle
free format packets. Moreover, communications in this mode are initiated only by writing a TX CMD,
thereby reducing traffic on the network.
Figure 8 - Packet Structure of Free Format Mode (Example of 32 bytes/page)
RAM-ADRS
8 bit constitution
(W16=L,WDMD=0)
1E
00
01
02
03
04
05
1F
.
.
.
.
7
Format
Free
DID
SID
CP
DATASHEET
0
Page 36
RAM-ADRS
16 bit constitution
(W16=L,WDMD=1 OR W16=H)
1E
00
02
04
.
.
.
.
15
dummy
DID
1
Format
Free
8 7
Peripheral Mode CircLink™ Controller
SID
CP
0
SMSC TMC2072
0
Datasheet