參數(shù)資料
型號(hào)： SAA7377
廠商： NXP Semiconductors N.V.
英文描述： Digital servo processor and Compact Disc decoder CD7
中文描述： 數(shù)字伺服處理器和CD7抗原光盤(pán)解碼器
文件頁(yè)數(shù)： 29/56頁(yè)
文件大?。?/td> 311K
代理商： SAA7377
1998 Jul 06
29
Philips Semiconductors
Product specifications
Digital servo processor and Compact Disc
decoder (CD7)
SAA7377
If t
1
(SUBQREADY-I status LOW to end of subcode read
is below 2.6 ms, then t
2
= 13.1 ms (i.e. the microcontroller
can read all subcode frames if it completes the read
operation within 2.6 ms after the subcode is ready). If this
criterion is not met, it is only possible to guarantee that t
3
will be below 26.2 ms (approximately).
If subcode frames with failed CRCs are present, the t
2
and
t
3
times will be increased by 13.1 ms for each defective
subcode frame.
7.14.1.6
Write servo commands
A write data command is used to transfer data (a number
of bytes) from the microcontroller, using the protocol
shown in Fig.28. The first of these bytes is the command
byte and the following are data bytes; the number
(between 1 and 7) depends on the command byte.
It should be noted that RAB must be held LOW; the
command or data is interpreted by the SAA7377 after the
HIGH-to-LOW transition of SILD; there must be a
minimum time of 70
μ
s between SILD pulses.
7.14.1.7
Writing repeated data in servo commands
The same data byte can be repeated by applying extra
SILD pulses as shown in Fig.29. SCL must stay HIGH
between the SILD pulses.
7.14.1.8
Read servo commands
A read data command is used to transfer data (status
information) to the microcontroller, using the protocol
shown in Fig.30. The first byte written determines the type
of command. After this byte a variable number of bytes can
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
transition on SILD); there must be a minimum time of 70
μ
s
between SILD pulses.
7.14.2
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;
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;
Send START condition
Send address 30H (write)
Write command byte
Send STOP condition.
Send START condition
Send address 31H (read)
Read data byte 1
Read data byte 2
Send STOP condition.
It should be noted that the timing constraints specified for
the read and write servo commands must still be adhered
to.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7377GP 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
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