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參數(shù)資料
| 型號： | SAA2500 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | MPEG Audio Source Decoder |
| 中文描述： | MPEG音頻源解碼器 |
| 文件頁數(shù)： | 37/47頁 |
| 文件大?。?/td> | 199K |
| 代理商： | SAA2500 |
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September 1994
37
Philips Semiconductors
Preliminary specification
MPEG Audio Source Decoder
SAA2500
Halt mode
Table 36
Requirements for timing (halt mode); see Fig.21.
SYMBOL
PARAMETER
REQUIREMENT
≥
190
≥
190
≥
190
UNIT
t
d1
t
L
t
h2
L3CLK HIGH to L3CLK LOW delay time after L3MODE HIGH
L3MODE LOW time
L3CLK hold time before L3MODE LOW
ns
ns
ns
Slave device to microcontroller
t
d2
t
d5
L3DATA enable time after L3MODE HIGH
L3DATA disable time after L3MODE LOW
0 < t
d2
≤
50
0 < t
d5
≤
50
ns
ns
Fig.21 Timing (halt mode).
handbook, full pagewidth
MGB509
tL
L3CLK
L3MODE
d5
t
h2
t
td1
d2
t
L3DATA
IC to
microcontroller
SAA2500 L3 protocol enhancement options
The L3 interface on the SAA2500 is limited in speed,
dictated both by the maximum SAA2500 handling speed
and the upper frequencies of the L3 interfacing standard.
On the other hand, the SAA2500 offers several
enhancements, described in this section, to make a better
use of the SAA2500 L3 interface capacity. The
enhancements are optional. The applicant chooses
whether to use them or not.
T
ESTING
L3RDY
BY POLLING
L3DATA
The host must test status flag L3RDY to make sure
whether the SAA2500 L3 interface is ready to transfer data
item bytes. According to the general protocol, described in
Section “Data items”, the status is read by first writing the
SAA2500 ‘read status’ operational address, after which
the status byte can be transferred. To avoid these status
byte transfers (thus reducing the host's load), after writing
the SAA2500 ‘read status’ operational address, L3RDY is
continuously copied to signal L3DATA during the period in
which no L3 transfers (i.e. status byte readings) are
performed. Meanwhile, L3MODE must be kept HIGH (no
L3 operational addresses may be written). As a result,
L3RDY can be tested as shown in Table 37.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA2500H | MPEG Audio Source Decoder |
| SAA2501 | Digital Audio Broadcast DAB decoder |
| SAA2501H | Digital Audio Broadcast DAB decoder |
| SAA2502 | ISO/MPEG Audio Source Decoder |
| SAA2502H | ISO/MPEG Audio Source Decoder |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA2500GP | 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 |
| SAA2500H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:MPEG Audio Source Decoder |
| 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 |
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