TMC2074-NU SMSC, TMC2074-NU Datasheet - Page 44

• 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

2.9.3
2.9.4
Revision 0.2 (10-23-08)
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1 WARTC Clear Command
2 Release Interrupt Mask
3 Read Data
3 Read Data
3 Read Data
3 Read Data
3 Read Data
4 Read EC Status
5 Error processing
6 Interrupt Mask
CPU Side
Example of Receive Flow in Remote Buffer Mode
(RXMH/RXML REGISTER: When in RXM07 = 1)
CircLink can be treated as a simple data buffer such as "read data from the CircLink at any timing".
After completing the receive of remote buffer mode, RRCV (Remote buffer receive end flag) in the EC
interrupts the status register (INTSTA) and changes from 0 to 1, permitting the flag to be an interrupt
source. This mode also monitors if a packet comes from applicable nodes within a certain period. If there is
a non-responsive node, the WARTERR flag changes from 0 to 1, permitting this change to be an interrupt
source. Refer to section 3.2.9 - INTSTA Register: EC Interrupt Status.
Warning Timer (WT) at Remote Buffer Receive
CircLink checks the logical AND RXF flags of all pages that are set to remote buffer mode. A result of 1
during a cycle indicates a normal state in which there is no silent node on the network. In this case the
object flags are cleared after a certain period of time (see table below).
In contrast, if the result retains a 0, the condition is not in a normal state, and WATERR in the EC interrupt
status register changes from 0 to 1. This condition will generate an interrupt..
This function is initialized by writing a warning timer clear command into the EC Command register. The
monitoring time is set by the warning timer resolution setup pins: WPRE [2:0] and WARTC3-0 in the Carry
Selection register.
Actually, the warning timer clear command only clears WATERR flag. The Warning timer function starts
automatically after releasing software reset. So some initial settings for this function set before releasing
software reset.
Procedure:
Step-1: Turn on software reset (RESET bit = 1 in COMR6 register)
Step-2: Set initial settings (Rx-Mode, CARRY-Selection, etc..)
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DATASHEET
Page 44
Interrupt occure
Each time packet
comes automatic
WARTERR = 1
RXFn = X->0
TMC2074/72
(NID=n)
receive
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Dual Mode CircLink™ Controller
LAN Side
SMSC TMC2074
Datasheet