參數(shù)資料
型號(hào)： SAA7374
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Low voltage digital servo processor and Compact Disc decoder CD7LV
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
文件頁(yè)數(shù)： 31/60頁(yè)
文件大小： 324K
代理商： SAA7374
1998 Feb 26
31
Philips Semiconductors
Product specification
Low voltage digital servo processor and
Compact Disc decoder (CD7LV)
SAA7374
If t
1
(SUBQREADY-I status LOW to end of subcode read)
is below (2.6/n) ms, then t
2
= (13.1/n) ms [i.e. the
microcontroller can read all subcode frames if it completes
the read operation within (2.6/n) 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/n) ms
(approximately).
If subcode frames with failed CRCs are present, the t
2
and
t
3
times will be increased by (13.1/n) ms for each defective
subcode frame.
It should be noted that in the lock-to-disc mode ‘n’ is
replaced by ‘d’, which is the disc speed factor.
7.15.1.6
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 SAA7374 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 shown in Fig.29. SCL must stay 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.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 command byte (LOW-to-HIGH transition
on SILD) there must be a delay of 70
μ
s before reading
data is started (i.e. on the next HIGH-to-LOW transition of
SILD); there must be a minimum time of 70
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;
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
SAA7374GP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low voltage digital servo processor and Compact Disc decoder CD7LV
SAA7376 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
SAA7377 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
SAA7377GP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder CD7
SAA7377GP/M1,518 功能描述:IC DIGITAL PROCESSOR/CD7 64QFP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動(dòng)電話，手機(jī)，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064
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