sm5953a Nippon Precision Circuits Inc, (NPC), sm5953a Datasheet - Page 9

• Manufacturer Part Number: sm5953a
• Description: Surround Effects Processor Lsi
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

Microcontroller Interface (YMDATA, YMCLK, YMLD)
The SM5953A is controlled using commands issued over the microcontroller interface.
Command format
Commands from the microcontroller are input in bit serial format over a 3-wire interface comprising a data
input (YMDATA), bit clock (YMCLK), and load signal latch enable input (YMLD). The write command for-
mat for commands A0 to A5 is shown below.
Register table
I
I
Command A0
Command A1
YMDATA
YMCLK
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Bit
D7
D6
D5
D4
D3
D2
D1
D0
YMLD
Flag name
Flag name
ATM7
ATM6
ATM5
ATM4
ATM3
ATM2
ATM1
ATM0
ATP7
ATP6
ATP5
ATP4
ATP3
ATP2
ATP1
ATP0
D7 D6 D5 D4 D3 D2 D1 D0 B7 B6 B5 B4 B3 B2 B1 B0
ATP7 to ATP0: L + R component input attenuator parameter
Attenuation = 20 × log
“1111 1111” → −0.03dB
“1000 0000” → −6.02dB
“0000 0001” → −48.16dB
“0000 0000” → −∞dB
ATM7 to ATM0: L − R component input attenuator parameter
Attenuation = 20 × log
“1111 1111” → −0.03dB
“1000 0000” → −6.02dB
“0000 0001” → −48.16dB
“0000 0000” → −∞dB
Data 8 bit
10
10
(ATP/256) [dB]
(ATM/256) [dB]
SM5953A
Description
Description
Command 8 bit
SEIKO NPC CORPORATION —9
Default
Default
0
1
0
1
0
0
0
0
0
1
0
1
0
0
0
0