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參數(shù)資料
| 型號： | SAA7325 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Digital servo processor and Compact Disc decoder with integrated DAC (CD10 II)(具有綜合數(shù)模轉(zhuǎn)換器（DAC）的數(shù)字伺服處理器和光盤譯碼器) |
| 中文描述： | 數(shù)字伺服處理器和光盤解碼器集成了援會（CD10型二）（具有綜合數(shù)模轉(zhuǎn)換器（DAC）的的數(shù)字伺服處理器和光盤譯碼器） |
| 文件頁數(shù)： | 34/68頁 |
| 文件大小： | 281K |
| 代理商： | SAA7325 |
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2000 Jun 26
34
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10 II)
SAA7325
It should be noted that RAB must be held LOW; the
command or data is interpreted by the SAA7325 after the
HIGH-to-LOW transition of SILD; there must be a
minimum time of 70
μ
s between SILD pulses.
7.15.1.7
Writing repeated data in servo commands
The same data byte can be repeated by applying extra
SILD pulses as illustrated in Fig.30. SCL must be HIGH
between the SILD pulses.
7.15.1.8
Read servo commands
A read data command is used to transfer data (status
information) to the microcontroller, using the protocol
shown in Fig.31. The first byte written determines the type
ofcommand.Afterthisbyteavariablenumberofbytescan
be read. It should be noted that RAB must be held LOW;
after the end of the command byte (LOW-to-HIGH
transition on SILD) there must be a delay of 70
μ
s before
reading data is started (i.e. the next HIGH-to-LOW
transitiononSILD);theremustbeaminimumtimeof70
μ
s
between SILD pulses.
7.15.2
M
ICROCONTROLLER INTERFACE
(I
2
C-
BUS MODE
)
Bytes are transferred over the interface in groups (i.e.
servo commands) of which there are two types: write data
commands and read data commands.
The sequence for a write data command (that requires
3 data bytes) is as follows:
1.
2.
3.
4.
5.
6.
7.
Send START condition
Send address 30H (write)
Write command byte
Write data byte 1
Write data byte 2
Write data byte 3
Send STOP condition.
It should be noted that more than one command can be
sent in one write sequence.
The sequence for a read data command (that reads 2 data
bytes) is as follows:
1.
Send START condition
2.
Send address 30H (write)
3.
Write command byte
4.
Send STOP condition
5.
Send START condition
6.
Send address 31H (read)
7.
Read data byte 1
8.
Read data byte 2
9.
Send STOP condition.
It should be noted that the timing constraints specified for
the read and write servo commands must still be adhered
to.
Fig.23 Microcontroller write protocol for registers 0 to F.
A3
A2
A1
A0
D3
D2
D1
D0
SDA
(SAA7325)
SCL
(microcontroller)
RAB
(microcontroller)
SDA
(microcontroller)
MGL683
high-impedance
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