ak7746 ETC-unknow, ak7746 Datasheet - Page 27

• Manufacturer Part Number: ak7746
• Description: Audio With 5-channel 24-bit Input
• Manufacturer: ETC-unknow

62h
Command
W
2-2) CONT1 : RAM control
Recommend changing this register during the system reset state ( S_RESET =”L”).
Note) Underlines of the setting of “_” mean default setting.
[MS0369-E00]
[ASAHI KASEI]
Code
D7:DATARAM DATARAM addressing mode selector
D6:RM: Decompress bit mode
D5,D4:BANK[1:0] DLRAM Setting
D3:CMP_N 12bitDLRAM Compress & Decompress selector
D2,D1:SS[1:0] DLRAM setting of sampling timing (only for RAM A)
D0: Input always 0
72h
0: Ring addressing mode
1: Linear addressing mode
0: SIGN bit
1: Random data
When mode 1, 2 or 3 is selected, this register can set the compress/decompress function.
0: Compress & Decompress function ON
1: Compress & Decompress function OFF
R
DATARAM has 256-word x 24-bit and has 2 addressing pointer (DP0, DP1).
The Ring addressing mode: starting address increments by 1 every sample period.
The Linear addressing mode: starting address is always the same, DP0 = 00h and DP1 = 80h.
It always writes to DLRAM MSB 12-bit of DBUS data and it read from MSB 12-bit of DLRAM and add to 000h for LSB bits.
Note) When the mode 1,2 or 3 is selected, it comes out aliasing.
Note) When mode 0 or 1 is selected, pointer 0 and 1 are available for both RAM area.
When data is written to DLRAM the DBUS data is compressed to 12-bits. and when it data is read from DLRAM, it is
decompressed to 24-bits.
When Compress & Decompress modes (D3:CMP_N = 0) are selected, this bit determines the decompressed LSB bits.
When inputs D0, CONT1 setting is fixed.
CONT1
Name
When mode 2 or 3 is selected, pointer 0 is available for RAM A and pointer 1 is available for RAM B.
When DLRAM is not used, mode 2 or 3 should be selected.
Mode
Mode
0
1
2
3
0
1
2
3
DRAM
D7
BANK1:D5
SS[1]:D2
0
0
1
1
0
0
1
1
RM
D6
BANK0:D4
SS[0]:D1
0
1
0
1
0
1
0
1
BANK[1]
D5
24-bit 3kword(RAM A)
12-bit 6kword(RAM A)
12-bit 4kword(RAM A),24bit 1kword(RAM B)
24-bit 1kword(RAM A),12bit 4kword(RAM B)
RAM A mode selected by BANK[1:0]
Update every sampling time
Update every 2 sampling time
Update every 4 sampling time
Update every 8 sampling time
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BANK[0]
D4
CMP_N
D3
Memory
SS[1]
D2
SS[0]
D1
D0
×
[AK7746]
2004/12
0000 000X
Default