sta003t STMicroelectronics, sta003t Datasheet - Page 22

• Manufacturer Part Number: sta003t
• Description: Mpeg 2.5 Layer Iii Audio Decoder
• Manufacturer: STMicroelectronics

STA003T
PLLFRAC_L ([7:0])
PLLFRAC_H ([15:8])
Address: 0x64 - 0x65
Type: R/W
Software Reset: 0xC8-0x59
Hardware Reset: 0xC8-0x59
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 STA003T fractional PLL parame-
ters:
where:
PLLFRAC=256 x FRAC_H + PLLFRAC_L (decimal)
FRAME_CNT_L
FRAME_CNT_M
22/32
FC15 FC14 FC13 FC12 FC11 FC10 FC9
PF15 PF14 PF13 PF12 PF11 PF10
MSB
MSB
MSB
MSB
FC7
PF7
b7
b7
b7
b7
OCLK_Freq
PF6
FC6
b6
b6
b6
b6
PLLCTL_M
FC5
PF5
b5
b5
b5
b5
MFSDF X
FC4
PF4
b4
b4
b4
b4
1
1
FC3
PF3
b3
b3
b3
b3
1
PLLFRAC
65536
FC2
PF2
PLLTL_N
b2
b2
b2
b2
MCLK_freq
FC1
PF1
PF9
b1
b1
b1
b1
1
LSB
PF0
LSB
PF8
LSB
FC0
LSB
FC8
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.
They are 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 STA003T 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
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
b0
b0
b0