TMC2074-NU SMSC, TMC2074-NU Datasheet - Page 28

• 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

2.4.3
NOTE:
2.5
NOTE:
Revision 0.2 (10-23-08)
PAGE SIZE
256 Byte
128 Byte
Reduction of Reconfiguration Burst Signal Send Time
Since the CircLink maximum packet size is smaller than ARCNET, the reconfiguration burst signal is of
shorter duration, thus reducing the time required for network reconfiguration (as listed in the table below).
“Burst Signal Sending Time” is the time under operation at 2.5 Mbps. The time is half at 5 Mbps.
RAM Page Expansion
The original ARCNET buffer RAM is divided into 256 or 512-bytes per page. This configuration has a
maximum of four pages available in 1 kByte increments, leaving the majority of the RAM unused when
small data packets are used. CircLink RAM addressing has been modified to significantly expand the
number of pages available in RAM and to store pages corresponding to the node IDs on the network as
listed in Table 2.
64 Byte
32 Byte
*
1
: Node ID = 00 is used only for the system development and is not available for users.
ARCNET
CircLink
PS[1:0]
() : Data Size
00
01
10
11
--
--
Table 2 - The Number of Nodes and RAM Page Size
PS[1:0]
MAX Packet Size
MAX Packet Size
256(253)Byte
00
01
10
11
128(125)Byte
512(508)Byte
64(61)Byte
32(29)Byte
DATASHEET
NODE ID(MIN)
01h
01h
01h
01h
Page 28
Burst Signal Sending Time
Burst Signal Sending Time
*1
NODE ID(MAX)
1.63ms
1.07ms
0.79ms
0.65ms
2.75ms
0Fh
1Fh
03h
07h
PAGE ADDRESS
Dual Mode CircLink™ Controller
100h X ID
80h X ID
40h X ID
20h X ID
SMSC TMC2074
Datasheet