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參數(shù)資料
| 型號(hào)： | SAA2501 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Digital Audio Broadcast DAB decoder |
| 中文描述： | 數(shù)字音頻廣播民建聯(lián)的解碼器 |
| 文件頁數(shù)： | 15/52頁 |
| 文件大小： | 206K |
| 代理商： | SAA2501 |
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January 1995
15
Philips Semiconductors
Preliminary specification
Digital Audio Broadcast (DAB) decoder
SAA2501
Table 7
Signals of coded data master input interface
SIGNAL
DIRECTION
FUNCTION
CDM
CDMEF
CDMCL
CDMWS
input
input
output
output
ISO/MPEG coded input data (master input)
coded data (master input) error flag
coded data (master input) bit clock
coded data (master input) word select
Fig.7 Input data serial transfer format (master input).
handbook, full pagewidth
CDMWS
CDMCL
CDMEF
CDM
1
2
16
17
n
1
2
1 unreliable data bit (example)
valid data
valid but unreliable data
invalid data
MGB495
Data clock CDMCL is being output, having a fixed
frequency of 768 kHz. Signal CDM carries the coded data
in bursts of 16 valid bits. Coded data input frames may
only start either at the first or at the ninth bit of a 16 bit valid
data burst (i.e. only at a byte boundary). The value of word
select signal CDMWS is changed every time new input
data is needed: one CDMCL period after each transition in
CDMWS, 16 bits of valid data are read serially. Assume N
is the number of CDMCL periods between two transitions
of CDMWS, and R is the number of CDMCL periods to
obtain the effective bit rate E (in kbits/s) at a transferring
data rate of 768 kbits/s, i.e.
. The SAA2501
R
16
768
E
×
=
keeps N close to R, but N can vary plus or minus two:
N
∈
{round(R)
2,...,round(R)+2}.
Error flag CDMEF is used to indicate input data
insecurities (e.g. due to erratic channel behaviour). In
Fig.7, an example with one unreliable bit is shown. The
value of CDMEF may vary for each valid data bit, but is
combined by the SAA2501 for every group of 8 input bits.
7.17.2
T
HE CODED DATA SLAVE INPUT INTERFACE
The coded data slave input interface signals are shown in
Fig.8. The coded data master input interface consists of
5 signals (see Table 8).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA2501H | Digital Audio Broadcast DAB decoder |
| SAA2502 | ISO/MPEG Audio Source Decoder |
| SAA2502H | ISO/MPEG Audio Source Decoder |
| SAA2503 | MPEG2 audio decoder(MPEG2 音頻譯碼器) |
| SAA2503HT | MPEG2 audio decoder |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA2501H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital Audio Broadcast DAB decoder |
| SAA2501HB-S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Audio Decoder & Support |
| SAA2502 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ISO/MPEG Audio Source Decoder |
| SAA2502H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ISO/MPEG Audio Source Decoder |
| SAA2503 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:MPEG2 audio decoder |
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