TMC2074-NU SMSC, TMC2074-NU Datasheet - Page 40

• 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

2.9.1
Revision 0.2 (10-23-08)
As described above, CircLink constantly receives packets, with one exception: It abandons the received
packets when the receive mode of the corresponding page is Free Format mode and the receive flag is set
to 1 (Receive Inhibited). In this case, CircLink does not return an ACK even if the packet is addressed to
the node (this case is handled as a receive error).
If the receive mode of the corresponding page is set to Remote Buffer mode, CircLink unconditionally
stores packets in the corresponding page in the packet RAM as long as the received data is valid. The
previous packet is overwritten and the newest packet is always stored in the packet RAM.
The meaning of the receive flag varies depending on the receive mode:
0: Receive wait or receiving
1: Receive is inhibited or receives is completed
0: No receive in a certain period
1: One or more receive in a certain period
Temporary Receive and Direct Receive
Packets received are stored in the pages partitioned by the received source ID (received SID). There are
two methods for storing packets: storing after error checking through a temporary buffer (#00), and storing
directly. The decision of which process is used is automatically selected in CircLink based on the
combination of page size and communication speed prescaler setting. The smaller the page size or the
larger the division ratio of the transfer rate prescaler, the more data packets will be received through the
temporary buffer.
In the table above, “ % ” indicates ‘Temporary Relay Reception is not available in the default setting.
However, by setting the FARB Bit = 1 in register, Setup 2 temporary relay reception is available. The FARB
Bit = 1 setting is possible when the FARB bit default is 0 and only when the input clock is below 20 MHz.
CKP>=011
CKP[2:0]
(1) Free Format receive mode
(2) Remote Buffer receive mode
000
001
010
Bit Rate : Input clock
1:64 over
1:16
1:32
1:8
Prescale
% :
O :
X :
DATASHEET
Receive through temporary buffer available
Receive through temporary buffer not available
Receive through temporary buffer available with condition
1.25 Mbps : 20 MHz Xtal
2.5 Mbps : 20 MHz Xtal
625 kbps : 20 MHz Xtal
Communication Speed
Omission
Page 40
11:32B
O
O
O
O
Page Size Setting ? PS[1:0]
see paragraph below.
10:64B
O
O
O
O
Dual Mode CircLink™ Controller
01:128B 00:256B
%
O
O
O
SMSC TMC2074
%
O
O
X
Datasheet