TMC2074-NE SMSC, TMC2074-NE Datasheet - Page 32

• 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

2.5.3
NOTE:
Revision 0.2 (10-23-08)
Packet Data Structure
PS = [1:0] = Example of 11 (32-byte mode)
SID: Source-ID (Source node ID)
DID: Destination-ID (Destination node ID): DID=0 means the broadcast packet.
CP: Continuation pointer
Writes the value (Page size - N) for sending N-byte data. That is, it indicates the top position of data in the
page. The example shows the value is 1Ah (32 - 6 bytes = 26 bytes = 1Ah).
Limitations on the specifiable values for CP.
32B Mode (PS [1:0] = 11)
64B Mode (PS [1:0] = 10)
128B Mode (PS [1:0] = 01)
256B Mode (PS [1:0] = 00)
If a packet is sent with CP other than the specified value the destination node rejects the packet, and the
session closes with a sending error (TXERR). Simultaneously the CP error (CPERR) flag of the EC status
register is set, which can issue an interrupt. The error flag, however, means a setup or CP specification
error to the CircLink, and does not indicate a network error.
Sender:
Sending error (TXERR) and CP error (CPERR) flags are set and a token is passed to the next node. Since
TA flag is reset to 1 except in the remote buffer mode (TXM = 1) as well as the continuous send mode
(RTO = 0), a send command must be issued for re-sending.
RAMADR
8 bit constitution
(W16=L,WDMD=0)
1C
1D
1A
1B
1E
1F
00
01
02
7
DATA #0
DATA #1
DATA #2
DATA #3
DATA #4
DATA #5
CP = 1A
SID
DID
.
.
.
0
DATASHEET
: Values from 03h to 1Fh
: Values from 03h to 3Fh
: Values from 03h to 7Fh
: Values from 03h to FFh
Page 32
RAMADR
16 bit constitution
(W16=L,WDMD=1 OR W16=H)
1A
1C
1E
00
02
( Upper Byte ) ( Lower Byte)
( Upper Byte ) ( Lower Byte)
( Upper Byte ) ( Lower Byte)
15
DATA #0
DATA #1
DATA #2
dummy
DID
1
8 7
.
.
DATA #0
DATA #1
DATA #2
CP=1A
SID
0
Dual Mode CircLink™ Controller
0
SMSC TMC2074
Datasheet