SM5956A NPC, SM5956A Datasheet - Page 16

• Manufacturer Part Number: SM5956A
• Description: 6-channel Asynchronous Sample Rate Converter
• Manufacturer: NPC

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MCU Interface (MDT, MCK, MLE pins)
The SM5956A has a 3-wire serial MCU interface that is used to set the digital audio interface channel status
data.
Command format
The commands from a microcontroller are input using the data input (MDT), bit clock (MCK), and load signal
(MLE) inputs in bit serial format.
Register table
I
Note. Each flag operates using logic-OR with its corresponding external input pin of the same name. If only the MCU interface is used for control, all the
I
Note. This LSI can accept 4 type category codes shown in the table.
Address: 0/H
Address: 1/H
pins corresponding to the flags must be set to their inactive level. When the flags are set to their default level, control using external pins is enabled.
D11
D10
D11
D10
Bit
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Bit
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
MDT
MCK
MLE
Flag name
Flag name
OEDITON
DMUTEN
THROUN
Not used
Not used
Not used
Not used
Not used
Not used
SLAVEN
CATGY0
CATGY1
DEEMN
CNTL0
CNTL1
CNTL2
CNTL3
CFS1
CFS2
LBIT
CP1
CP2
FS1
FS0
A3 A2 A1 A0 D11D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Address 4bit
Set to 0 for normal operation
Set to 0 for normal operation
Set to 0 for normal operation
Set to 0 for normal operation
Set to 0 for normal operation
Direct mute flag
Through mode flag
Slave mode flag
DIT output enable flag
Deemphasis select flag
Deemphasis frequency select flag 1
Deemphasis frequency select flag 0
Channel status bit 0
Channel status bit 1
Channel status bit 2. COPY flag
Channel status bit 3. EMP flag
Category code set flag 0
Category code set flag 1
Channel status bit 15
Channel status bit 24
Channel status bit 25
Channel status bit 28
Channel status bit 29
Write command format
SM5956A
Description
Description
(CATGY1, CATGY0) = category
(0, 0) = “100 0000L” (CD)
(0, 1) = “100 1100L” (DVD)
(1, 0) = “100 0100L” (VCD)
(1, 1) = “010 1100L” (SRC)
Data 12bit
SEIKO NPC CORPORATION —16
Default
Default
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0