SM5950BM NPC, SM5950BM Datasheet - Page 10

• Manufacturer Part Number: SM5950BM
• Description: Asynchronous Sample Rate Converter
• Manufacturer: NPC

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FUNCTIONAL DESCRIPTION
Input Interface Settings (IMOD0, IMOD1, IISI)
Input data format
2s-complement, MSB-first, L/R alternating serial data
Note: L = Low input level, H = high input level
Input timing
The input timing for each input format is shown in figures 4 to 8.
Output System Clock (SCKO)
A clock with frequency 512 times the output sampling frequency (fso) must be input on SCKO. In master
mode, the LRCO and BCKO output clocks are derived from the input clock on SCKO. It also functions as the
internal computation circuit system clock.
Output Interface Settings (OMOD0, OMOD1, IISO, THROU, SLAVE)
Output data format
2s-complement, MSB-first, L/R alternating serial
Note: L = Low input level, H = high input level
Output mode select
Output timing
The timing for each output format is shown in figures 9 to 13. In slave mode, the input timing of LRCO and
BCKO for each output format is shown in figures 9 to 13. In through mode, the LRCI, BCKI, and DI inputs are
fed through to the outputs regardless of the output data format settings.
OMOD0
THROU
IMOD0
H or L
H or L
H
H
H
H
H
L
L
L
L
L
Pin setting
OMOD1
IMOD1
SLAVE
H or L
H or L
H or L
H
H
H
H
H
L
L
L
L
L
Through
Master
Mode
Slave
IISO
IISI
H
H
L
L
L
L
L
L
L
L
16-bit MSB-first right-justified
20-bit MSB-first right-justified
24-bit MSB-first right-justified
MSB-first left-justified (leading 16 bits valid data)
IIS (leading 16 bits valid data)
16-bit MSB-first right-justified
20-bit MSB-first right-justified
24-bit MSB-first right-justified
MSB-first left-justified (16-bit output)
IIS (16-bit output)
LRCO and BCKO are derived form SCKO.
LRCO and BCKO are supplied externally.
LRCO, BCKO, and DOUT are connected directly to
LRCI, BCKI, and DI inputs.
Note: DMUTE is valid.
SM5950BM
Description
Format
Format
Function
SEIKO NPC CORPORATION —10
Function as outputs
Function as inputs
Function as outputs
LRCO, BCKO