tc9446f TOSHIBA Semiconductor CORPORATION, tc9446f Datasheet - Page 8

• Manufacturer Part Number: tc9446f
• Description: Audio Digital Processor For Decode Of Dolby Digital Ac-3 , Mpeg2 Audio -
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2. Data Transmission Format
2-1.
2-1-1. Data Transmission Format in the Serial Mode
2-1-2. Data Transmission Method in the Serial Transmission Mode
1)
Serial Mode Setting
command at MSB first.
set to “H”.
needs to check that MIACK signal is set to “L”.
Program boot and a program start
continuously performed to an interruption vector address to store a program in 000Ah-007Fh.
(command = 000060h) And, after command transmission, program data (40 bit) is divided into 20 bit of a higher rank/low rank, and it transmits by the low-rank
stuffing of 24 bit data in the order of a higher rank (20 bit) and a low rank (20 bit).
it.
data transmission.
A data transmission format in the serial mode is shown in Figure 1.
After the data transmission at the time of the serial mode sets MICS signal to “L”, fundamentally, it checks that MIACK signal is “L” and transmits a 24 bit
However, it cannot transmit at the time of MIACK signal = “H”.
Then, the word set up by the 24 bit command which the Read or Write (R/W) of 24 bit data of a number (1-16 word) is performed, and, finally, MICS signal is
However, since there is a term when MIACK signal after transmission is set to “H” in a 24 bit command, at the time of Read, command transmission back also
As for TC9446F, RAM is assigned 128 words of program address 0000h-007Fh, and the interruption vector address is become 0000h-0009h.
Therefore, in order to operate TC9446F, it needs to interrupt and a program needs to be booted to a vector address. In addition, a program load needs to be
In order to perform program boot, the program RAM boot start bit and the soft reset bit in the 24 bit command transmitted after reset need to be set to “H”.
Since a write-in address is made automatic (+1) from 0000h, if it transmits the required number of words and MICS is set to “H”, program boot will complete
In addition, the write-in address of program boot always starts from 0000h.
A start of a program carries out and transmits the soft reset bit in a 24 bit command to “L”, and is performed by setting MICS to “H”, without performing
The procedure of program boot and a program start is shown in Figure 2.
MIACK
MIDIO
MICS
MILP
MICK
COMMAND (24 bit)
Figure 1 Serial Mode Data Transmission Format
DATA-1 (24 bit)
8
Transmission data (1 to 16 words)
DATA-16 (24 bit)
2002-04-18
TC9446F