TMC2074-NE SMSC, TMC2074-NE Datasheet - Page 47

• 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

Dual Mode CircLink™ Controller
Datasheet
2.10
2.10.1 General Description of Standalone Mode
2.10.2 Sending in Standalone Mode
SMSC TMC2074
nWR/DIR/PO[7]
nRD/nDS/PO[6]
D[15:6]/PI[15:6]
D[5:0]/AD[5:0]/PI[5:0]
PO[15:8]
A[5:4]/PO[5:4]
A[3]/ALEPOL/PO[3]
A[2]/ALE/PO[2]
A[1:0]/PO[1:0]
nCS/SCM[4]
nSWAP/SCM[3]
W16/SCM[2]
nRWN/SCM[1]
nMUX/SCM[0]
WPRE[2:0]/SPRE[2:0]
nINTR/NSTUNLOC
FLASHO
(High) /NSTC[3]
nEHWR/NSTC[2]
nEHRD/NSTC[1]
(High) NSTC[0]
nDSINV/CMIERRMD
Standalone Mode
The standalone mode allows CircLink to execute send/receive commands without CPU support. The
functions of the CPU interface signals need to be set as listed below Setting the nSTALONE pin to Low (0)
enables Standalone mode.
In standalone mode, internal registers cannot be accessed. The TXEN bit in the standalone mode defaults
to 1, allowing nodes to automatically join the network upon start-up (reset). Since the default parameters
such as page size, max. node ID, and the node ID are set with pins, this mode does not provide any
software solutions for network malfunction caused by any improper pin settings.
In standalone mode the contents of input port can be sent as a broadcast packet. Sending starts
automatically upon any of the following events.
(1) When the received packets are normally received with no CRC error. The packet format does not
(2) Timer Setup.
(3) When tokens are received.
have to be an output port controller packet (as stated later).
Pin
D[15:6]
D/AD[5:0]
Hi-Impedance
nWR/DIR
nRD/nCS
A[5:4]
A3/ALEPOL
A2/ALE
A[1:0]
nCS
nSWAP
W16
nRWM
nMUX
WPRE[2:0]
nINTR
FLASHO
Fix High
nEHWR
nEHRD
Fix High
nDSINV
Peripheral mode
DATASHEET
Page 47
Direction
I/O
I/O
---
O
O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Operation Mode
Inpu Port PI[5:0]
Output Port PO[15:8]
Output Port PO[7]
Output Port PO[6]
Output Port PO[5:4]
Output Port PO[3]
Output Port PO[2]
Output Port PO[1:0]
CMID Designate (bit4)
CMID Designate (bit3)
CMID Designate (bit2)
CMID Designate (bit1)
CMID Designate (bit0)
Input Port PI[15:6]
SPRE[2:0]
NSTUNLOC
FLASHO
NSTC[3]
NSTC[2]
NSTC[1]
NSTC[0]
CMIERRMD
Standalone Mode
Revision 0.2 (10-23-08)
Direction
O
O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
I
I
I
I