TC9446FG Datasheet, PDF (21/41 Pages) Toshiba Semiconductor – Audio Digital Processor for Decode of Dolby Digital (AC-3), MPEG2 Audio

TC9446FG
3. Setting Procedure Until it Starts Decode Program Operation
Setting procedure until it starts operation of the decode program built in TC9446FG is shown below.
First, 10 words program data is transmitted in the program boot mode after release of the power-on reset
at the time of a power-supply injection.
However, when there is a program required for others, program data of a maximum of 128 words can be
transmitted.
And, if the command of soft reset-off is transmitted, a program will begin to operate and decode will be
started by transmitting addresses of the write-in command shown in an attached sheet (the program
explanation data) after that 9 words of 0000h-0008h.
Procedure until it starts operation of a decode program to Figure 15 is shown.
Power ON reset
Program boot
Soft reset OFF
Write-in command transmission.
(9 word of 0000h to 0008h)
(9 word of continuing from 0000h are transmitted.)
Starting of decode
Figure 15 Procedure to Decode Program Operation Start
Note 7: Internal RAM is cleared, in order to muting for output, after transmitting a setup of command 0003h “decode
off” in the case of AC-3 decoder program. Please transmit following data after checking that ACK is set to
“L” from “H”, since such a case has the time for about 23 ms (maximum) in this processing. If processing of
the internal RAM clearance by the “decode off” command is completed, it will return at the waiting time for 1
or less ms.
In addition, according to the kind of decode program, please transmit following data after checking that ACK
is set to “L” from “H”, since the waiting time which the data transmission at the time of decode on/off takes
differs.
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2005-09-28