CMX649 CML Microcircuits, CMX649 Datasheet - Page 21

• Manufacturer Part Number: CMX649
• Description: ADM Codec
• Manufacturer: CML Microcircuits

ADM Codec
CODEC MODE CONTROL Register ($70)
Reserved
(Bits 7 – 3)
CODEC MODE
(Bits 2 – 0)
SCRAMBLER CONTROL Register ($71)
Scrambler
Enable
(Bit 15)
Reserved
(Bit 14)
Scrambler
Output Invert
(Bit 13)
De-Scrambler
Enable
(Bit 12)
Reserved
(Bit 11)
De-Scrambler
Input Invert.
(Bit 10)
LFSR Tap
Select
(Bits 9 – 0)
2003 CML Microsystems Plc
These bits are reserved and should be set to a logic 0.
Setting this bit to a logic 1 enables the scrambler.
Reserved for future use. Set to ‘0’.
Setting this bit to a logic 1 inverts the scrambler output polarity.
Setting this bit to a logic 1 enables the de-scrambler.
Reserved for future use. Set to ‘0’.
Setting this bit to a logic 1 inverts the de-scrambler input polarity.
These bits directly program the polynomial for the scrambler and de-scrambler:
PR = B9X
Bit 2
0
0
0
0
1
9
+ B8X
Bit 1
0
0
1
1
0
8
+ B7X
Bit 0
0
1
0
1
0
7
+B6X
ADM mode without buffered I/O
ADM mode with buffered I/O
Linear PCM with buffered I/O
µ-law PCM with buffered I/O
A-law PCM with buffered I/O
21
6
+ B5X
CODEC Mode
5
+ B4X
4
+ B3X
3
+ B2X
2
+ B1X
1
+ B0X
CMX649
0
D/649/2