AK7714VT Asahi Kasei Microsystems, AK7714VT Datasheet - Page 38

• Manufacturer Part Number: AK7714VT
• Description: 20-Bit Audio Codec with DSP and Delay RAM
• Manufacturer: Asahi Kasei Microsystems

[ASAHI KASEI]
3) Write during RUN phase
a) CRAM/OFRAM rewrite preparation and write (during RUN phase)
This function is used to rewrite CRAM (coefficient RAM) and OFRAM (offset RAM) during program execution. After
inputting the command code, you can input a maximum of 16 data of the continuous addresses 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 from address "10" of
the coefficient RAM are rewritten:
M0018-E-00
Coefficient RAM execution address 7 8 9 10 11 13 16 11 12 13 14 15
Rewrite position
Data transfer procedure
*Preparation for rewrite
*Rewrite
Note that address "13" is not executed until address "12" is rewritten.
Note: CRAM ranges from A8 to A0.
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.
OFRAM ranges from A4 to A0.
1) CRAM
2) OFRAM
CRAM and OFRAM rewriting preparation and writing
1
2
3
1
2
3
1
2
3
Command code
Data
Data
Command code
Address upper
Address lower
Command code
Address upper
Address lower
- 38 -
(10001000)
(D15 .....D8)
(D7......D0)
(10100100)
(0000000A8)
(A7000...A0)
(10010100)
(00000000)
(000A4...A0)
[AK7714]
‘98/07