AK7744VT Datasheet, PDF (22/50 Pages) Asahi Kasei Microsystems – 24bit 3ch ADC + 24bit 4ch DAC with Audio DSP

[ASAHI KASEI]
[AK7744]
2-2) CONT1: RAM control
Command Code Name
D7
D6
Write Read
64h
74h
CONT1 DATARAM RM
D5
D4
D3
BANK CMP_N
SS[1]
D2
SS[0]
D1
TEST
D0 Default
X
00h
c D7:DATARAM DATARAM addressing mode selector
0:Ring addressing mode
1:Linear addressing mode
DATARAM has 256-word x 24-bit and has 2 addressing pointers (DP0, DP1).
In Ring addressing mode: Starting address increments by 1 every sampling period.
In Linear addressing mode: Starting address is always the same, DP0 = 00h and DP1 = 80h.
d D6:RM: Depress bit mode
0: SIGN bit
1: Random data
When it selects Compress & Depress mode (D3:CMP_N = 0), this bit decides depressed LSB bits.
e D5:BANK DLRAM Setting
0:24bit 1kword
1:12bit 2kword
f D3:CMP_N 12-bitDLRAM Compress & Depress selector
When BANK[D5]=1 is selected, this register can set up ON or OFF of its compress/depress function.
0: Compress & Depress function ON
When it writes to DLRAM the DBUS data is compressed to 12-bit and when it read from DLRAM, the data.
is depressed to 16-bit.
1: Compress & Depress function OFF
It always writes to DLRAM MSB 12-bit of DBUS data and it reads from the MSB 12-bit of DLRAM and ad
d to 000h for LSB bits.
g D2,D1:SS[1:0] DLRAM setting of sampling timing.
Mode
D2
D1 RAM mode
0
0
0
Update every sampling time
1
0
1
Update every 2 sampling time
2
1
0
Update every 4 sampling time
3
1
1
Update every 8 sampling time
Note) When the mode 1,2 or 3 is selected, it comes out aliasing.
h D0: Input always 0
Note) Underlined settings of c~g = default setting.
<MS0167-E-00>
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2002/10