THS789 Datasheet, PDF (11/34 Pages) Texas Instruments – THS789 Quad-Channel Time Measurement Unit (TMU)

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THS789
SLOS776A – SEPTEMBER 2012 – REVISED DECEMBER 2015
Table 4. Central Control and Status Registers Description
Register Bit
Name
0 TEST_En
Function
Enables or disables factory test routines.
1 RESET
2 Reserved
3 Reserved
4 Reserved
5 Reserved
6 Reserved
7 Reserved
8 Reserved
9 Reserved
80h
10 OT_En
Reset the device. Device is fully operational after 250 μs.
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Enables or disables the over temperature alarm circuits.
11 RST_OT_ALM Resets the temperature alarm.
12 SYNC_TS_Pol
Defines the polarity of the Sync input for the upcoming
timestamp generation.
13 SYNC_IP_ENI Enables or disables the sync channel
14 PWR_DN
Powers down the device
15 RCLK_En
Enables RCLK
1 Reserved
2 Reserved
81h
3 Quiet_Mod
Reserved
Reserved
It disables the RCLK and digital clks internal during
timestamp process. Allows for only 16 timestamps.
0 TMU_Ready
Indicates that the internal clks, coarse counter and Sync
channel are operational.
1 OT_ALM
82h
Over temperature alarm. Indicates that the junction
temperature is 140°C.
2 DLL_Lock_Sync Indicates the Sync channel DLL lock status.
3 DLL_Lock_1G2 Indicates the lock status of the 1.2-GHz internal clock.
Logic State
0
1
0
1
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
0
1
0
1
0
1
0
1
0
1
Description
Disabled
Enabled
Reset
Disabled
Enabled
Reset alarm state
Positive edge
Negative edge
Sync disabled
Sync enabled
Powered up
Powered down
Disabled
Enabled
N/A
N/A
Normal mode
Quiet mode
Device is not ready
Device is ready
No alarm
Alarm is enabled
DLL is locked
DLL is not locked
DLL is locked
DLL is not locked
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