TMC2074-NU SMSC, TMC2074-NU Datasheet - Page 75

• Manufacturer Part Number: TMC2074-NU
• Description: IC CTRL CIRC 128VTQFP PERIPH MOD
• Manufacturer: SMSC
• Series: CircLink™r

Specifications of TMC2074-NU

• Controller Type: I/O Controller
• Interface: Transceiver
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 40mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 128-TQFP, 128-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1024

Dual Mode CircLink™ Controller
Datasheet
3.2.4
SMSC TMC2074
nWRAPAR=1
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
PAGE4-0=00001, RAMADR4-0=11111
PAGE4-0=00010, RAMADR4-0=00000
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 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 comprise one
10-bit register. 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). An
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 75
PAGE3-0
reserved (all "0")
RAM Address 7-0
8
PAGE4-0
nWRAPAR=0
7
PAGE4-0=00001, RAMADR4-0=11111
PAGE4-0=00001, RAMADR4-0=00000
6
5
RAMADR7-0
RAMADR6-0
4
RAMADR-5-0
RAMADR4-0
3
address:06h
2
Revision 0.2 (10-23-08)
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