BT8954 CONEXANT [Conexant Systems, Inc], BT8954 Datasheet - Page 47

• Manufacturer Part Number: BT8954
• Description: VOICE PAIR GAIN FRAMER
• Manufacturer: CONEXANT [Conexant Systems, Inc]

Bt8954
Voice Pair Gain Framer
N8954DSC
following equations:
are in the PLL_INT register [0xB0], FRAC bits are in the PLL_FRAC_HI and
PLL_FRAC_LO registers [0xB1 and 0xB2], the A Bit is in the PLL_A register
[0xB3], and the B bit is in the PLL_B register [0xB4]. PLL_X is represented by
the PLL_X register bits of the PLL_SCALE register [0xB5.0,1], as given in
Table
Table 3-5. PLL_X Register Mapping
ADPCMCK and PCMCKO are related to BCLK and HCLK through the
The fractional part, FRACP, is scaled as follows:
The OUT_OF_LOCK output is the PLL_ERR interrupt. PLL_INT[5:0] bits
3-5.
f
f
f
FRACP
f
PLL_X[1]
B
f
H
PLL
f
REF
ADPCMCK
PCMCKO
=
=
0
0
1
1
N x 64kbps
=
32 x f
=
f
----------------- -
PLL_X
REF
=
f
=
B
H
=
Conexant
------------------------------ -
x PLL_INT.FRACP
f
------------------------- -
FRAC
ADPCMCK
------------------- -
PLL_W
PLL_Y
65536
f
PLL
+
Non PayloadBitRate
+
A
-- -
B
–
PLL_X[0]
0
1
1
0
3.0 Circuit Descriptions
Sleep Mode
f
H
/f
1
2
4
REF
3.9 PLL
3-25