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參數資料
| 型號： | SAA2500H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 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： | 31/47頁 |
| 文件大?。?/td> | 199K |
| 代理商： | SAA2500H |
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September 1994
31
Philips Semiconductors
Preliminary specification
MPEG Audio Source Decoder
SAA2500
APPENDIX
Preliminary specification 3-line ‘L3’ interface
I
NTRODUCTION
The main purpose of the new interface definition is to
define a protocol that allows for the transfer of control
information and operational details between a
microcontroller (
μ
C) and a number of slave devices, at a
rate that exceeds other common interfaces, but with a
sufficient low complexity for application in consumer
products. It should be clearly noted that the current
interface definition is intended for use in a single
apparatus, preferably restricted to a single printed circuit
board.
The new interface requires 3 signal lines (apart from a
return ‘ground’) between the microcontroller and the slave
devices (from this the name ‘L3’ is derived). These 3-lines
are common to all ICs connected to the bus: L3MODE,
L3DATA and L3CLK. L3MODE and L3CLK are always
driven by the microcontroller, L3DATA is bidirectional:
Table 31
The 3-lines common to all ICs; L3MODE,
L3CLK and L3DATA.
Notes
1.
L3MODE is used for the identification of the operation
mode.
L3CLK is the bitclock to which the information transfer
will be synchronized.
L3DATA will carry the information to be transferred.
2.
3.
SIGNAL
MICROCONTROLLER
SLAVE
DEVICE
L3MODE
(1)
L3CLK
(2)
L3DATA
(3)
output
output
output/input
input
input
input/output
All slave devices in the system can be addressed using a
6 bit address. This allows for up to 63 different slave
devices, as the all ‘0’ address is reserved for special
purposes. In addition it is possible to extend the number of
addressable devices using ‘extended addressing’.
In operation 2 modes can be identified:
1.
Addressing mode (AM).
During addressing mode a single byte is sent by the
microcontroller. This byte consists of 2 data operation
mode (DOM) bits and 6 operational address (OA) bits.
Each of the slave devices evaluates the operational
address. Only the device that has been issued the
same operational address will become active during
the following data mode. The operation to be executed
during the data mode is indicated by the two data
operation mode bits.
2.
Data mode (DM).
During data mode information is transferred between
microcontroller and slave device. The transfer
direction may be from microcontroller to slave (‘write’)
or from slave to microcontroller (‘read’). However,
during one data mode the transfer direction can not
change.
Addressing mode
In order to start an addressing mode the microcontroller
will make the L3MODE line LOW. The L3CLK line is
lowered 8 times and the DATA line will carry 8 bits. The
addressing mode is ended by making the L3MODE line
HIGH.
相關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 |
| SAA2503 | MPEG2 audio decoder(MPEG2 音頻譯碼器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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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