DS92UT16 Datasheet, PDF (54/111 Pages) Texas Instruments – DS92UT16TUF UTOPIA-LVDS Bridge for 1.6 Gbps Bi-directional Data Transfers

DS92UT16
OBSOLETE
SNOS992E – JANUARY 2002 – REVISED APRIL 2013
SOFTWARE LOCK—0x00 to 0x01 SLK0 to SLK1
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Table 20. SLK0–SLK1^(1)(2)(3)
SLK0 0x00
SLK1 0x01
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
(1) All configuration and control registers can be read by the processor to determine the status of the
DS92UT16.
(2) All reserved (register bits for internal use only) and unused (no register) bits will be read as zero and
should be written as zero to ensure future compatibility.
(3) Writing to read only register bits has no affect.
Type: Read as 0x00
Software Lock: No
Reset Value: 0x00
The Software Lock registers are used to implement a software lock mechanism on configuration and control
registers to prevent spurious software changes to the device which may affect its operation. On reset the
Software Lock is ON. Writes to registers protected by this lock will have no affect. To switch the lock OFF the
following sequence of writes to the SLK registers must occur.
UNLOCK SEQUENCE
1. Write data 0x00 to SLK0.
2. Write data 0xFF to SLK1.
The software lock is now OFF and those registers protected by it can be successfully written to.
To switch the lock back On the following sequence of writes to the SLK registers must occur.
LOCK SEQUENCE
1. Write data 0xDE to SLK0.
2. Write data 0xAD to SLK1.
The software lock is now ON and those registers protected by it cannot be written to.
The order of the writes in each sequence must be followed. However, the sequence does not have to be
contiguous. For instance, the processor can Write data 0xDE to SLK0, then carry out further read/write cycles to
this or another device before completing the LOCK sequence with Write data 0xAD to SLK1.
The full lock or unlock sequence must be completed to take effect.
The status of the Software Lock can be read at any time from the SLOCK bit of the GCS register.
VERSION IDENTIFICATION—0x02 VID
7
VID[7]
6
VID[6]
5
VID[5]
Table 21. VID
4
VID[4]
3
VID[3]
2
VID[2]
1
VID[1]
0
VID[0]
Type: Read only
Software Lock: No
Reset Value:⁽¹⁾
• VID[7:0] Version identification number. NOTE that this is only a proprietary Version number and that the
standard Device ID register is contained in the JTAG TAP controller as described in Test Features.
(1) The reset value of the VID register will be different for various versions of the device.
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