UTOPIA16EVK/NOPB National Semiconductor, UTOPIA16EVK/NOPB Datasheet - Page 43

• Manufacturer Part Number: UTOPIA16EVK/NOPB
• Manufacturer: National Semiconductor

Specifications of UTOPIA16EVK/NOPB

• Lead Free Status / Rohs Status: Compliant

MTBQF0
MTBCF3
MTBCF2
MTBCF1
MTBCF0
QFL
MTBQOV3
MTBQOV2
MTBQOV1
MTBQOV0
Unused
D2ULBCC
UAA
UAIE
Unused
ALFLT3
ALFLT2
ALFLT1
ALFLT0
Unused
Reserved
Reserved
Reserved
Reserved
Register Name
18.0 Register Description
Note 9: The reset value of the VID register will be different for various versions of the device.
Note 10: All configuration and control registers can be read by the processor to determine the status of the DS92UT16.
Note 11: 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.
Note 12: Writing to read only register bits has no affect.
18.1 SOFTWARE LOCK — 0x00 to 0x01 SLK0 to SLK1
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.
SLK0 0x00
SLK1 0x01
Address
0xDD to
0xE3 to
0xDC
0xDA
0xDB
0xDF
0xFC
0xFD
0xD3
0xD4
0xD5
0xD6
0xD7
0xD8
0xD9
0xE0
0xE1
0xE2
0xF6
0xF7
0xF8
0xF9
0xFA
0xFB
0xFE
0xFF
7
0
0
Software
Lock
Y
Y
Y
Y
Y
Y
N
N
N
N
N
N
N
N
N
N
N
TABLE 20. Register Map Summary (Continued)
6
0
0
(Continued)
Reset
Value
0xFF
0xFF
0xFF
0xFF
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
TABLE 21. SLK0–SLK1
5
0
0
18.67 MTB Queue Flush 0
18.68 MTB Cell Flush 3
18.68 MTB Cell Flush 2
18.68 MTB Cell Flush 1
18.68 MTB Cell Flush 0
18.69 Queue Flush
18.70 MTB Queue Overflow 3
18.70 MTB Queue Overflow 2
18.70 MTB Queue Overflow 1
18.70 MTB Queue Overflow 0
18.71 ATM Down2Up Loopback Cell Count
18.72 UTOPIA and ATM Alarms
18.73 UTOPIA and ATM Interrupt Enables
18.74 ATM Loopback Cell Filter 3
18.74 ATM Loopback Cell Filter 2
18.74 ATM Loopback Cell Filter 1
18.74 ATM Loopback Cell Filter 0
43
4
0
0
3
0
0
Section and Description
2
0
0
1
0
0
0
0
0
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