SM5844 NPC [Nippon Precision Circuits Inc], SM5844 Datasheet - Page 12

• Manufacturer Part Number: SM5844
• Description: Asynchronous Sample Rate Converter
• Manufacturer: NPC [Nippon Precision Circuits Inc]

FUNCTIONAL DESCRIPTION
Input Data Interface (DI, LRCI, BCKI, IFM1, IFM2)
Attenuator and Deemphasis Selection
The attenuator is set using the microcontroller
interface. When the attenuator is used, deemphasis
settings also need to be set using the microcontroller
interface. The microcontroller interface comprises
MDT, MCK and MLEN, and is used to receive all
input serial data.
Table 1. Attenuator and deemphasis function
selection
When MCOM is HIGH, serial data received on
MDT, MCK and MLEN sets the attenuation data and
control flag data.
When MCOM is LOW, the logic levels on FSI1,
FSI2 and DEEM select the device function.
Deemphasis
O N / O F F
Deemphasis
frequency (fsi)
select
Attenuator data set
Test mode select
M o d e
Function
1
2
3
4
H I G H
H I G H
L O W
L O W
I F M 1
N/A (no attenuation)
( M C O M = L OW )
External pins
(test mode 1)
FSI1, FSI2
Irreversible
D E E M
Function set method
H I G H
H I G H
I F M 2
L O W
L O W
11 bits (a1 to a11)
( M C O M = H I G H )
Microcontroller
interface flags
FTST1, FTST2
FFSI1, FFSI2
F D E E M
W ord length
16 bits
20 bits
SM5844AF
Data position
Rear packed
Front packed
Rear packed
s e q u e n c e
M S B fi rst
LSB first
Data
NIPPON PRECISION CIRCUITS—12
Non IIS
L/R alternating
Bit serial
C o m m o n f eatures