LC78616PE Datasheet, PDF (17/26 Pages) ON Semiconductor – Compact Disc Player IC

LC78616PE
CDTEXT data output function
CDTEXT data are decoded and buffered to external SDRAM.
There are two methods to output CDTEXT data from theSDRAM.
(1) Command Communication output mode
Outputs the CDTEXT data using the command communication protocol between this IC and external host
controller.
(2) Hand shake output mode using with hardware interface function
A. Inputs data request signal and transfer clock then outputs CDTEXT data
The CDTEXT data(CTDATO) will be output synchronizing with the CTCKI clock when the CTCKI
clock is input after the CDTEXT data request signal is input(CTREQI="H").
B. Inputs data request signal then outputs transfer clock and CDTEXT data
The CTCKO and CTDATO synchronized with CTCKO will be output after the CDTEXT data request
signal is input (CTREQI= "H").
In both operation modes (1) and (2), the data transfer unit bit length is 2 Bytes (16 bits).
* The CDTEXT function and CD subcode data output function are exclusive each other, and then those functions
can not be used simultaneously.
 CDTEXT data output Timing 1 : CTCK input mode
CTREQI
(Input)
CTCKI
(Input)
CTDATO
(Output)
tCTCKIN
1/fSCI
tCTDOD
tCTCKL tCTCK
<Supplement>
Both modes below are available.
A. CTCKI="L" start mode
The CTDATO is output synchronized with the rising edge of the CTCKI clock.
The host controller should latch the CTDATO data at the falling edge of the CTCKI clock.
B. CTCKI="H" start mode
The CTDATO is output synchronized with the falling edge of the CTCKI clock.
The host controller should latch the CTDATO data at the rising edge of the CTCKI clock.
* The relationship between the signals in figure 8-1 and the pins is shown below.
CTREQI : CONT00, CONT03, CONT08
CTCKI : CONT01, CONT04, CONT09
CTDATO :CONT02, CONT05, CONT10
Parameter
CTCKI clock Frequency
CTCKI clock input start time
CTCKI clock "H" level width
CTCKI clock "L" level width
CTDATO output Delay time
Symbol
Pin Names
Min Typ Max
fSCI
CTCKI
1.25
tCTCKIN
CTREQI,
CTCKI
1000
tCTCKH
CTCKI
400
tCTCKL
CTCKI
400
tCTDODL1
CTCKI,
CTDATO
250
Note : The above figure shows the case of mode A that the clock starts low level (CTCKI="L").
The timings are same when the clock starts high level (CTCKI="H").
unit
MHz
ns
ns
ns
ns
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