TMC2072-MD SMSC, TMC2072-MD Datasheet - Page 37

• Manufacturer Part Number: TMC2072-MD
• Description: Network Controller & Processor ICs Peripheral Mode CircLink Cntlr
• Manufacturer: SMSC

Specifications of TMC2072-MD

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

Peripheral Mode CircLink™ Controller
Datasheet
SMSC TMC2072
Remote Buffer Mode
Remote Buffer mode, a CircLink enhancement, optimizes real-time performance. In this mode CircLink can
be handled as a simple data buffer like "write data into the CircLink at any time" at a transmit node and
"read data from the CircLink at any time" at a receiver node “.
Since the remote buffer mode is a "token-oriented" mode that features automatic transmission each time a
node receives a token (= sending right), preparation of the packet header portion (SID, DID, and CP) is
required prior to issuing a TX CMD. The data portion of a packet must be valid in 8 or 16 bits. This mode
restricts the data structure, but it is optimized in its real-time performance when compared to Free Format
mode since it can always communicate with the packet data.
Setting RTO to 1 (Default = 0) in the mode register limits CircLink to one packet per TX CMD write. If RTO
is switched to 1 while operating under RTO = 0, the automatic send operation is disabled immediately after
the completion of the packet delivery.
In 16-bit constitution, upper and lower bytes in the same word are preserved as the same packet data
(Refer to section 3.2.5 - COMR4 Register: Data Register).
Figure 9 - Packet Structure of Remote Buffer Mode (Example of 32 bytes/page)
RAM-ADRS
8 bit constitution
(W16=L,WDMD=0)
1A
1B
1C
1D
1E
00
01
02
1F
:
:
:
7
BYTE#0
BYTE#1
BYTE#2
BYTE#3
BYTE#4
BYTE#5
CP=1A
SID
DID
:
:
:
DATASHEET
0
Page 37
RAM-ADRS
16bit constitution
(W16=L,WDMD=1 OR W16=H)
1C
1A
1E
00
02
:
:
15
( Upper Byte) ( Lower Byte )
( Upper Byte) ( Lower Byte )
( Upper Byte) ( Lower Byte )
WORD#0
WORD#1
WORD#2
dummy
DID
1
8 7
:
:
WORD#0
WORD#1
WORD#2
CP=1A
Revision 0.1 (06-07-07)
SID
0
0