AK7755EN_16 Datasheet, PDF (69/109 Pages) Asahi Kasei Microsystems – DSP with Mono ADC Stereo CODEC + Mic/Lineout Amp

[AK7755]
Read
Command Address Data Length Description
0x24
16bit 24bit×n
CRAM/OFREG Preparation Data Read during RUN
0x32
16bit 24bit×n
Read operation form OFREG during system reset
0x34
16bit 24bit×n
Read operation from CRAM during system reset
0x38
16bit 40bit×n
Read operation from PRAM during system reset
0x3B
16bit 24bit×n
Read operation from ACRAM during system reset
0x40~0x5F None 8bit
Write operation to Control Registers 00~1Fh
0x60
None 8bit
Device Identification
0x66
None 8bit
Write operation to Control Register 26h
0x6A
None 8bit
Write operation to Control Register 2Ah
0x70
None 8bit
DSP Error Status Read
0x72
None 16bit
CRC result Read
0x76
None
32bit
Read operation from MIR1
28-bit is upper-bit justified. Lower 4-bits are for validity flags.
0x78
None
32bit
Read operation from MIR2
28-bit is upper-bit justified. Lower 4-bits are for validity flags.
0x7A
None
32bit
Read operation from MIR3
28-bit is upper-bit justified. Lower 4-bits are for validity flags.
0x7C
None
32bit
Read operation from MIR4
28-bit is upper-bit justified. Lower 4-bits are for validity flags.
Reading other than this command code is prohibited.
5. Echo-Back Mode
The AK7755 has an echo-back mode that the device outputs write data sequentially from the SO pin.
5-1. Write Sequence
CSN
SI
COMMAND ADDRESS1 ADDRESS2
DATA1
DATA2
don’tcare
(L/H)
COMMAND ADDRESS1
SO
COMMAND
ADDRESS1 ADDRESS2
DATA1
Hi-Z or Low
Figure 49. Echo-Back Writing 1 (SPI)
The input data of the SI pin is echoed back on the SO pin by shifting 8-bit to the right.
COMMAND
CSN
SI
0xB4
0x00
0x00
DATA1
DATAn
Dummy 8bit
n=3~5
SO
X (Hi-Z or low) _{COMMAND ADDRESS1 ADDRESS2}
DATA1
DATAn
Figure 50. Echo-Back Writing 2 (SPI)
X (Hi-Z or Low)
It is possible to verify the written data by inputting an extra 8-bit clock. If the dummy data is more than
the data length, this dummy data is written on the next address. (40 bits for PRAM, 24 bits for CRAM
and 24 bits for OFREG writings)
014006643-E-00
- 69 -
2014/10