tc9446f TOSHIBA Semiconductor CORPORATION, tc9446f Datasheet - Page 13

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

5)
Incorrect operation detection
the incorrect operation detection start bit in a 24 bit command to “H”. As for this incorrect operation
detection start bit, the reversal output only of the case of MICS terminal = “H” is carried out from
MIACK terminal.
program is operating normally, MIACK terminal at the time of MICS terminal = “H” is set to “H”
from “L”.
as for MIACK terminal at the time of MICS terminal = “H”, the state of “L” will continue.
time of MICS terminal = “H”. Moreover, although it checks that MIACK terminal is “L” after setting
program is a incorrect operation state, when the state of MIACK = “H” continues.
state by initializing by transmitting the soft reset command which the reset terminal was set to “L” or
was mentioned above.
MICS terminal to “L” in case a MCU starts access to TC9446F, MCU can judge that an internal
(waiting for becoming to MIACK = “L” at the MIACK = “H”)
Incorrect operation detection of the internal program of TC9446F can be made to perform by setting
And, since this incorrect operation detection start bit is periodically cleared by “L” when an internal
However, since it will stop being cleared if an internal program becomes a incorrect operation state,
Thus incorrect operation detection of a program is attained by supervising MIACK terminal at the
In addition, when a incorrect operation state is detected, it can return from a incorrect operation
The procedure of incorrect operation detection is shown in Figure 6.
(starting the incorrect operation detection = 000080h)
Program makes to clear the incorrect operation
Figure 6 Procedure of Incorrect Operation Detection
Transmission of 24 bit command
Checking of MIACK = “L”
MIACK = “H”
MIACK = “L”
detection bit
MICS = “H”
MICS = “L”
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When not set to “L” with “H”, it is the state
of incorrect operation.
It starts the incorrect operation detection
by “1”.
MIACK = “L” is continue at incorrect
operation, as detection bit isn’t cleared.
2002-04-18
TC9446F