THS788 Datasheet, PDF (20/43 Pages) Texas Instruments – QUAD-CHANNEL TIME MEASUREMENT UNIT (TMU)

THS788
SLOS616B – MARCH 2010 – REVISED JUNE 2011
www.ti.com
Table 14. Central Control and Status Registers Description
Register Bit
Name
0 TEST_En
Function
Enables or disables factory test routines.
1 RESET
2 DDR_En
3 Connect_AB
Reset the device. Device is fully operational after 250 μs.
It enables DDR mode allowing the result interface to
output data on both edges.
It connects channels A and B inputs together.
4 Connect_CD
5 Rlength0
6 Rlength1
80h
7 Rlength2
8 RCLK_sel0
It connects channels C and D inputs together.
Define the result data length being used for the time
stamps.
Define the result data length being used for the time
stamps.
Define the result data length being used for the time
stamps.
Define RCLK frequency.
9 RCLK_sel1
Define RCLK frequency.
10 OT_En
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
time stamp generation.
13 SYNC_IP_ENI Enables or disables the sync channel
14 PWR_DN
Powers down the device
1 CNT_Rng0
Defines the coarse counter range
81h
2 CNT_Rng1
Defines the coarse counter range
3 Quiet_Mod
It disables the RCLK and digital clks internal during time
stamp process. Allows for only 16 time stamps.
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 1.2GHz internal clk.
Logic State
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Description
Disabled
Enabled
Reset
Normal mode
DDR Mode
Inputs not connected
Inputs connected
Inputs not connected
Inputs connected
Length value
Length value
Length value
Length value
Length value
Length value
Frequency value
Frequency value
Frequency value
Frequency value
Disabled
Enabled
Reset alarm state
Positive edge
Negative edge
Sync disabled
Sync enabled
Powered up
Powered down
Range value
Range value
Range value
Range value
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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