AK7746 Datasheet, PDF (53/62 Pages) Asahi Kasei Microsystems – Audio DSP with 5-channel 24-bit ADC and Input Mux

[ASAHI KASEI]
[AK7746]
b) OFRAM rewrites preparation and writes (during RUN phase)
This function is used to rewrite OFRAM (offset RAM) during program execution. After inputting the command code, you
can input a maximum of 16 data (3 bytes 1 set) of a continuous address you want to rewrite.
Then input the write command code and rewrite the leading address. Every time the RAM address to be rewritten is specified, the
contents of RAM are rewritten. The following is an example to show how five data bytes from address "10" of the offset RAM are
rewritten:
Offset RAM execution address 7 8 9 10 11 13 16 11 12 13 14 15
ÈÈ
ÈÈÈ
Rewrite position
} }Ç
}}}
Note that address "13" is not executed until address "12" is rewritten.
Data transfer procedure
* Preparation for rewrite c Command code 98h ( 1 0 0 1 1 0 0 0 )
d Data
(0 0 0 0 0 0 0 0)
e Data
( 0 0 0 D12 . . . D8 )
f Data
( D7 . . . . . . D0 )
* Rewrite
c Command code 94h ( 1 0 0 1 0 1 0 0 )
d Address
( 0 0 A5A4 . . . A0)
S_RESET
RQ
SCLK
SI
RDY
SO
10011000 0**0D12 ** D0
10010100 00 A5***A0
max 400ns
RDYLG
Note: The RDY signal will go to high within the maximum of two LRCLKs if the RDYLG width is
programmed to ensure a new address to be rewritten within one sampling cycle.
Fig.8-28 OFRAM rewriting preparation and writing
[MS0369-E00]
- 53 -
2004/12