MSP 3400C
PRELIMINARY DATA SHEET
4.6. S-Bus Interface
Digital audio information provided by the DMA 2381 via
the AMU is serially transmitted to the MSP 3400C via the
S-Bus. The MSP 3400C is always in S-Bus master
mode.
The S-Bus interface consists of three pins:
1. S_DA_IN:
Four channels (4*16 bits) per sampling cycle (32 kHz)
are transmitted.
2. S_CL:
Gives the timing for the transmission of S-DATA
(4.608 MHz).
3. S_ID:
After 64 S-CLOCK cycles, the S_ID determines the end
of one sampling period.
A detailed timing diagram is shown in Fig. 4–6.
(Data: MSB first)
H
S-Ident
L
H
S-Clock
64 Clock Cycles
L
H
S-Data
16 Bit Sound 1 16 Bit Sound 2 16 Bit Sound 3 16 Bit Sound 4
L
A
B
Section B
Section A
t
S6
H
L
H
S-Ident
S-Ident
L
t
S1
t
S2
t
S3
H
L
H
L
S-Clock
4.608 MHz
S-Clock
4.608 MHz
t
S4
t
S5
H
L
H
L
LSB of Sound 1
S-Data
MSB of Sound 4
S-Data
Fig. 4–6: S-Bus timing diagram
14
MICRONAS INTERMETALL
MICRONAS [ MICRONAS ]
