TMC2084-HT Standard Microsystems (SMSC), TMC2084-HT Datasheet - Page 45

• Manufacturer Part Number: TMC2084-HT
• Manufacturer: Standard Microsystems (SMSC)

Specifications of TMC2084-HT

• Number Of Transceivers: 1
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Standalone Mode CircLink
Datasheet
2.9
SMSC TMC2084
NST15 - 0
RXIN
TXD
POR
MYRECON
OPICDONE
NST Time Stamps
TMC2084 can handle packets with an attached time stamp. The time stamp is known as NST (Network
Standard Time). Every node in the network has its own clock that is synchronized to the NST of the clock
master node (CM node). Only one clock master node is allowed to exist in a network.
NST has 16-bit length and is included in the last two bytes of the packet that is sent or received. The NST
has a different meaning depending on whether it is in a received or transmitted packet.
The NST used in the time stamp usually represents the time at which the packet is transmitted (see Y in
the figure shown below). If you need the time stamp that represents the time at which data on an INPUT
PORT is taken using the external trigger, please configure bits TXTRG3 – 0 = 6h (i.e., external trigger
using NST latch). The time stamp represents the time at which the external trigger is inputted (see X in the
figure shown below).
External trigger inputted
Latches data on INPUT PORT
NST is also latched when TXTRG3-0 = 6h
TM
(transmitted from non-CM node)
Controller
X
(transmitted from CM node)
Indicates that hardware reset or receiving the SOFTWARE RESET command caused
software reset.
1: Either hardware or software reset was performed.
0: No reset was performed.
Indicates that RECON timer has expired, dropping the node from the network. When no
node recognized its own node, i.e., no own token received during the time period of 52 ms
(@2.5 Mbps), the RECON timer expires.
1: The RECON timer expired.
0: The RECON timer did not expire.
Indicates that the INITIALIZE OUTPUT PORT command was executed.
1: The INITIALIZE OUTPUT PORT command was executed.
0: It was not executed.
Transmitted packet
Received packet
Received packet
Packet Type
15.6 μs @ 2.5 Mbps
DATASHEET
Own token
Page 45
TXTRG3-0 = 0h-5h, 7h and Eh
TXTRG3-0 = 6h
Synchronization with CM node
Transmitting time stamp
Receiving time stamp
INPUT DATA packet
68.4 μs @ 2.5 Mbps
Usage of NST
Y
: Sends NST(X)
: Sends NST(Y)
Revision 0.2 (10-23-08)
Next node
Token for