372
x: Unused bits. The value of these bits is not guaranteed.
12.4.8
Part ID Packet
The Part ID Packet is sent by the FLEX decoder whenever the FLEX decoder is disabled due to
the checksum feature. See 12.3.1, Checksum Packet for a description of the checksum feature.
Since the FLEX decoder is disabled after reset, this is the first packet that will be received by the
host after reset. The ID of the Part ID Packet is 255 (decimal).
Table 12-29 Part ID Packet Bit Assignments
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Byte 3
1
1
1
1
1
1
1
1
Byte 2
MDL
1
MDL
0
CID
13
CID
12
CID
11
CID
10
CID
9
CID
8
Byte 1
CID
7
CID
6
CID
5
CID
4
CID
3
CID
2
CID
1
CID
0
Byte 0
REV
7
REV
6
REV
5
REV
4
REV
3
REV
2
REV
1
REV
0
MDL: Model. This identifies the FLEX decoder model. Current value is 0.
CID: Compatibility ID. This value describes the FLEX decoders to which this part is backwards
compatible. See table below for meaning and current value.
Bit
Indicates this IC can be used in place of
Value for FLEX
TM
Roaming Decoder II
CID
0
FLEX Alphanumeric Decoder I
*
1
1 (TRUE)
CID
1
FLEX Roaming Decoder I
*
2
1 (TRUE)
CID
2
FLEX Numeric Decoder
0 (FALSE)
Notes: 1. Compatibility to FLEX Alphanumeric Decoder II is indicated by MDL set to 0, CID 0 set
to 1, and REV greater than or equal to 7.
2. Compatibility to FLEX Roaming Decoder II is indicated by MDL set to 0, CID 1 set to 1,
and REV greater than or equal to 8.
REV: Revision. This identifies the revision and manufacturer of the FLEX decoder. The
following table lists the currently available part ID’s of the FLEX decoder family.
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