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STA003T データシート(PDF) 22 Page - STMicroelectronics

部品番号 STA003T
部品情報  MPEG 2.5 LAYER III AUDIO DECODER
PDF  32 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA003T データシート(HTML) 22 Page - STMicroelectronics

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PLLFRAC_L ([7:0])
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
PF7
PF6
PF5
PF4
PF3
PF2
PF1
PF0
PLLFRAC_H ([15:8])
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
PF15 PF14 PF13 PF12 PF11 PF10
PF9
PF8
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:
OCLK_Freq
= 
1
MFSDF
(X) + 1
⋅ 
MCLK_freq
PLLTL_N
+ 1
⋅
⋅ 
PLLCTL_M
+ 1 +
PLLFRAC
65536
where:
PLLFRAC=256 x FRAC_H + PLLFRAC_L (decimal)
FRAME_CNT_L
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
FC7
FC6
FC5
FC4
FC3
FC2
FC1
FC0
FRAME_CNT_M
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
FC15 FC14 FC13 FC12 FC11 FC10
FC9
FC8
FRAME_CNT_H
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
FC23 FC22 FC21 FC20 FC19 FC18 FC17 FC016
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
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
AB7
AB6
AB5
AB4
AB3
AB2
AB1
AB0
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
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
SV7
SV6
SV5
SV4
SV3
SV2
SV1
SV0
After the STA003T boot, this register contains the
version code of the embedded software.
STA003T
22/32



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