ML22Q563 datasheet(47/66 Pages) ETC2

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FEDL2257X-05

ML22Q573/ML2257X

14. RDSTAT command

command

ERR

The RDSTAT command enables reading the status of internal operation. It is possible to input the CLOOP

command regardless of the status of the NCR signal during playback, but a prescribed command interval needs

taking.

The ERR bit selects reading the playback status for each channel or reading the status of the fail-safe function.

Keep the SI pin to “L” when read the status.

ERR

Content of data to read

NCR and BUSYB signals for each channel (Initial value)

Status of the fail-safe function

If the ERR bit is set to ”0”, the following status will be read:

Output bit

Output

data

BUSYB3

BUSYB2

BUSYB1

BUSYB0

NCR3

NCR2

NCR1

NCR0

When the ERR bit = ”0”, the NCR and BUSYB signals of each channel are read.

The NCR signal outputs a

“L” level while this LSI is performing command processing and goes to a “H” level when the LSI enters a

command waiting state.

The BUSY signal outputs a “L” level during voice playback.

The table below shows the contents of each data output at a status read.

Output status signal

BUSY3

Channel 3 BUSYB output

BUSY2

Channel 2 BUSYB output

BUSY1

Channel 1 BUSYB output

BUSY0

Channel 0 BUSYB output

NCR3

Channel 3 NCR output

NCR2

Channel 2 NCR output

NCR1

Channel 1 NCR output

NCR0

Channel 0 NCR output

If the ERR bit is set to ”1”, the following status will be read:

Output bit

Output data

TSDERR

BLDERR

WCMERR

When the ERR bit = ”1”, the status of each fail-safe function is read.

If any of the following three fail-safe

functions is activated, the ERR pin is set to a “H” level and the corresponding error bit is set to “1”.

If the ERR

pinis set to a “H” level, check the error contents using the RDSTAT command and take appropriate measures.

Error signal

Error contents

TSDERR

High temperature error bit.

This bit is set to “1” if the temperature of the LSI reaches or exceeds the temperature set by the

SAFE command. For details see the section on the SAFE command.

BLDERR

Power supply voltage error bit.

This bit is set to “1” if the power supply voltage level reaches or falls below the voltage set by

the SAFE command. For details see the section on the SAFE command.

WCMERR

Command tansfer errro bit.

This bit is set to “1” if a transfer error occurs in two-time command input mode.

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