sta013b STMicroelectronics, sta013b Datasheet - Page 23

• Manufacturer Part Number: sta013b
• Description: Mpeg 2.5 Layer Iii Audio Decoder
• Manufacturer: STMicroelectronics

PLLFRAC_L ([7:0])
PLLFRAC_H ([15:8])
Address: 0x64 - 0x65
Type: R/W
Software Reset: 0x46 | 0x5B
Hardware Reset: 0xNA | 0x5B
The registers are considered logically concate-
nated and contain the fractional values for the
PLL, used to select the internal configuration.
After Reset, the values are NA, and the opera-
tional setting are done when the MPEG synchro-
nisation is achieved.
The following formula describes the relationships
among all the STA013 fractional PLL parameters:
where:
FRAC=256 x FRAC_H + FRAC_L (decimal)
These registers are a reference for 48 / 24 / 12 /
32 / 16 / 8KHz audio.
FRAME_CNT_L
FRAME_CNT_M
PF15 PF14 PF13 PF12 PF11 PF10 PF9
FC15 FC14 FC13 FC12 FC11 FC10 FC9
OCLK_Freq =
MSB
MSB
MSB
MSB
PF7
FC7
b7
b7
b7
b7
FC6
PF6
b6
b6
b6
b6



PF5
FC5
X + 1
b5
b5
b5
b5
1



PF4
FC4
⋅
b4
b4
b4
b4



MCLK_freq
N + 1
PF3
FC3
b3
b3
b3
b3



FC2
PF2
b2
b2
b2
b2
⋅



M + 1 +
PF1
FC1
b1
b1
b1
b1
FRAC
65536
LSB
LSB
LSB
FC0
LSB
FC8
PF0
PF8
b0
b0
b0
b0



FRAME_CNT_H
Address: 0x67, 0x68, 0x69
Type: RO
Software Reset: 0x00
Hardware Reset: 0x00
The three registers are considered logically con-
catenated and compose the Global Frame
Counter as described in the table.
It is updated at every decoded MPEG Frame.
The registers are reset on both hardware and
software reset.
AVERAGE_BITRATE
Address: 0x6A
Type: RO
Software Reset: 0x00
Hardware Reset: 0x00
AVERAGE_BITRATE is a read-only register and
it contains the average bitrate of the incoming bit-
stream. The value is rounded with an accuracy of
1 Kbit/sec.
SOFTVERSION
Address: 0x71
Type: RO
After the STA013 boot, this register contains the
version code of the embedded software.
FC23 FC22 FC21 FC20 FC19 FC18 FC17 FC016
MSB
MSB
MSB
AB7
SV7
b7
b7
b7
AB6
SV6
b6
b6
b6
AB5
SV5
STA013 - STA013B - STA013T
b5
b5
b5
AB4
SV4
b4
b4
b4
AB3
SV3
b3
b3
b3
AB2
SV2
b2
b2
b2
AB1
SV1
b1
b1
b1
LSB
LSB
AB0
LSB
SV0
23/38
b0
b0
b0