TMC2072-MD SMSC, TMC2072-MD Datasheet - Page 68

• 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

3.2.4
Revision 0.1 (06-07-07)
nWRAPAR=1
PAGE4-0=00001, RAMADR4-0=11111
PAGE4-0=00010, RAMADR4-0=00000
PAGE + RAMADR (10bit Reg.)
PS=11: 32Page , 32Byte
PS=10: 16Page , 64Byte
PS=01: 8Page ,128Byte
PS=00: 4Page ,256Byte
References of 2.5.1 chapter "RAM access" about the structure of a/the packet buffer
COMR3 Register: Page-Internal Address Register
- When reading/writing: ARCNET address pointer lower register (New)
RAMADR 7-0 (bits 7 to 0)
These bits specify addresses in the pages of the packet buffers. When the AUTOINC bit of COMR2 is 1,
the value increments every time when the data register (COM4) is accessed. The upper limit of the
specifiable value is restricted by the size of the page.
The COMR2 page (PAGE) and COMR3 page-internal address (RAMADR) registers actually comprises
one 10-bit register and the boundary differs depending on the specification of the page size, as shown
below.
In continuously accessing data register with AUTOINC = 1 set, you can specify how to carry out
overflowing RAMADR with nWRAPAR bit of COMR2. Zero (0) set-up carries it out to the top of the current
page and one (1) set-up move it to the top of the next page (or to #00 if the current is the final page).
Example of the operation at PS = 11 is shown below.
*1: Not equivalent to ARCNET original specifications. (The bit length variable)
*1
COMR3
[READ/WRITE]
15-8
7-0
bit
(Address Register)
name
--------
RAMADR7-0
DATASHEET
init. value description
PAGE1-0
X
0
9
PAGE2-0
Page 68
PAGE3-0
reserved (all "0")
RAM Address 7-0
8
PAGE4-0
nWRAPAR=0
PAGE4-0=00001, RAMADR4-0=11111
PAGE4-0=00001, RAMADR4-0=00000
7
6
5
RAMADR7-0
RAMADR6-0
4
RAMADR-5-0
Peripheral Mode CircLink™ Controller
RAMADR4-0
3
address:06h
2
1
SMSC TMC2072
0
Datasheet