TMC2074-NE SMSC, TMC2074-NE Datasheet - Page 20

• 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

NOTE:
NOTE:
1.6.5
1.6.6
1.6.7
Revision 0.2 (10-23-08)
Address acquisition timing in the CircLink delays about 50 ns (with 20 MHz-XTAL).
The read signal differs depending on the CPU type:
nRWM = H: nDS signal at DIR = H
nRWM = L: nRD signal
Refer to the AC timing specifications (in another document) for details (setup time, hold time, etc.).
Compare timing specifications for nEHRD=L and nEHRD=H.
Data Bus Width Selection
(W16/SCM[2]: Pin)
This pin selects the width of the data bus in the peripheral mode; H: 16-bit mode, L: 8-bit mode. In the 16-
bit mode, the LSB address in the CircLink is fixed to 0. In the standalone mode, this pin is the clock-
master-ID input pin SCM[2].
Data Bus Byte Swap
(nSWAP/SCM[3]: Pin)
In peripheral mode, this pin selects the data order at 8-bit access. Although the registers in the CircLink
are defined as 16-bit width, 8-bit access is available, and in this case, the assignment of lower/upper byte
of the register and odd/even number of addresses can be changed. The nSWAP=L assigns the lower byte
to even number address/ upper byte to odd number address, and the nSWAP=H assigns the lower byte to
odd number address /upper byte to even number address. In standalone mode, this pin is the clock master
ID input SCM[3].
Data Strobe Polarity Specification
(nDSINV/CMIERRMD: pin)
In peripheral mode, this pin selects the pin polarity of data strobe (nDS). It is active low with nDSINV = H
and active high with nDSINV = L. In standalone mode, this pin is equivalent to CMIERRMD (bit 12) in
Mode Register. The packet receive stops upon the occurrence of a CMI receive error correction (CMIECC)
with CMIERRMD = H.
DATASHEET
Page 20
Dual Mode CircLink™ Controller
SMSC TMC2074
Datasheet