參數(shù)資料
型號： SAA2500H
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： MPEG Audio Source Decoder
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT-307-2, QFP-44
文件頁數(shù)： 14/47頁
文件大小： 199K
代理商： SAA2500H
September 1994
14
Philips Semiconductors
Preliminary specification
MPEG Audio Source Decoder
SAA2500
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) 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. R = 16*768/E. The SAA2500
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 SAA2500 for every group of 8 input bits.
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
SAA2501 Digital Audio Broadcast DAB decoder
SAA2501H Digital Audio Broadcast DAB decoder
SAA2502 ISO/MPEG Audio Source Decoder
SAA2502H ISO/MPEG Audio Source Decoder
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA2500HB-S 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video Processing/ENDEC for MPEG
SAA2501 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital Audio Broadcast DAB decoder
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
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