TMC2074-NE SMSC, TMC2074-NE Datasheet - Page 35

• 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
2.7
2.7.1
SMSC TMC2074
Operation Mode
CircLink Operation and Communication Modes
CircLink has two operation modes: Peripheral mode, which carries out communications in partnership with
a system CPU, and Standalone mode, which enables communications by CircLink without a CPU. These
modes can be switched by the nSTALONE pin. In the standalone mode, the pins for interfacing CPU are
switched as ports for the external input/output and internal registers cannot be accessed. There are two
communication modes in peripheral mode: Free format mode, which is capable of handling a free format
packet, and Remote Buffer mode, which uses CircLink RAM as a simple buffer. The register bits RXM01 to
31 specify the RX mode of each page and TXM specifies the mode for TX mode.
Operational Mode
Peripheral mode
Peripheral mode acts as the system CPU's peripheral circuit and has two communication modes, Free
Format mode and Remote Buffer mode. The communication mode is independently selectable for send
and receive; TXM of mode register for sender and RXM01 to RXM31 of receive mode register for receive.
The communication mode for sender and receiver must be identical and the communication mode of the
receiver page should be adjusted to match the communication mode of the sender.
Standalone mode
Peripheral mode
nSTALONE Pin = H
nSTALONE Pin = L
Receive
Transmit
DATASHEET
Communication Mode
Page 35
*1: n = 01 to 31
*1: n = 01 to 31
RXMn
RXMn
TXM
TXM
=0
=1
=0
=1
*1
*1
Receive of Free Format Mode
Receive of Remote Buffer Mode
Transmit of Free Format Mode
Transmit of Remote Buffer Mode
(Every Page every designate)
(Every Page every designate)
Revision 0.2 (10-23-08)