[ASAHI KASEI]
[AK7740ET]
7-4) Read-out during RUN phase (SO output )
SO outputs data on DBUS (data bus) from the DSP section. Data is set when the @MICR command is executed in the
DSP program. Setting the data allows DRDY to go to "H", and data is output synchronized with the falling edge of
SCLK. When SI goes "H", DRDY goes to "L" to wait for the next command. Once DRDY goes "H", the data from
the last @MICR command immediately before DRDY went "H" is held until SI goes "H", and subsequent commands
will be rejected. A maximum of 24 bits are output from SO. After the required number of data (not exceeding 24 bits)
is taken out by SCLK, setting SI to “H” can output the next data.
S_RESET
RQ
SI
@MICR
DRDY
Data1
Data2
SCLK
SO
DM Data1
DLSB
DM Data2 DLSB
SO read (during RUN phase)
The SI pin controls clearing the output buffer (MICR). When reading this data, be aware that state changes on SI are
asynchronous to the audio sampling clock, which may result in noise in the audio sugnal.
<Pre-E-01>
- 42 -
2006/10
AKM [ ASAHI KASEI MICROSYSTEMS ]
