TMC2084-HT SMSC, TMC2084-HT Datasheet - Page 46

• Manufacturer Part Number: TMC2084-HT
• Description: IC CTRLR CIRCLINK TM 48-TQFP
• Manufacturer: SMSC
• Series: CircLink™r

Specifications of TMC2084-HT

• Controller Type: I/O Controller
• Interface: Transceiver
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP, 48-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Other names: 638-1025

2.9.1
NOTE:
2.9.2
Revision 0.2 (10-23-08)
Controls time
synchronization
Specifies resolution
NSTPRE2 - 0
Time Synchronization
Receiving the packet from the clock master after configuring both bit sets CMID3 – 0 and NSTPRE2 - 0 to
the appropriate values enables synchronization with NST.
CMID3 - 0
NSTPRE2 - 0
All nodes must have a common resolution. (Except for the asynchronous case).
The local time is synchronized each time with unicasted or broadcasted packet received from the CM node
that is specified by bits CMID3 – 0 and even with any packet that the CM node transmits. The NSTUNLOC
pin of FLAG OUTPUT and the NSTUNLOC status bit indicate whether the device is synchronized to the
NST of CM node. For detailed information, see the sections on FOSL3 – 0 in Configuration Through the
Network and the Status Bits.
Carry Output
Configuring both the bit sets FOSL3 - 0 (flag selection) and NSTC3 – 0 through the network enables the
nNSTCOUT pin (NST carry output) of the FLAG OUTPUT to output the operating state of NST counter.
Additionally, configuring the NSTCOMD bit through the network enables the selection of output type from
either pulse (NSTCOMD = 0) or clock (NSTCOMD = 1: default).
Figure 6 - Functional Diagram of NST Carry Output Generation Section
2
0
0
0
0
1
1
1
1
The ID number for the clock master. It must be in the range 1 to 15 (1 to 7 for PSSL = L).
The resolution of NST. Its range must be the system clock period multiplied by 32 to 4096.
NSTPRE
NST
Table 2 - Bits NSTPRE2 – 0 And NST Resolution
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
16
NSTC3 - 0
Dividing Ratio
DATASHEET
1: 1024
1: 2048
1: 4096
1: 128
1: 256
1: 512
1: 32
1: 64
16 to1 MUX
Selects output digits
4
Page 46
Resolution and NST Period
Selects output type
102.4 μs
204.8 μs
12.8 μs
25.6 μs
51.2 μs
1.6 μs
3.2 μs
6.4 μs
NSTCOMD
generator
@ 20 MHz Clock
Clock
Pulse
2 to1 MUX
Time stamp for transmit packet
1
0
13,420 ms
1,680 ms
3,360 ms
6,710 ms
105 ms
210 ms
409 ms
839 ms
Standalone Mode CircLink
nNSTCOUT
SMSC TMC2084
TM
Datasheet
Controller