DATA SHEET
MAS 35x9F
4.6.2.5. S/PDIF Output Characteristics
at T = T , V
, V
= 2.2 ... 3.6 V, f
= 18.432 MHz, Typ. values for T = 25 °C in P(L/M)QFP package.
CRYSTAL A
A
SUPD SUPA
Limit Values
Symbol
Parameter
Pin Name
Unit
Test Conditions
Min.
Typ.
Max.
fs1
fs2
fs3
tP
Bi-phase frequency
Bi-phase frequency
Bi-phase frequency
Bi-phase period
SPDO
SPDO
SPDO
SPDO
3.072
2.822
2.048
326
MHz
MHz
MHz
ns
fs = 48 kHz
fs = 44.1 kHz
fs = 32 kHz
at fs = 48 kHz, (highest
sampling rate)
tR
tF
Rise time
Fall time
SPDO
SPDO
SPDO
SPDO
0
0
2
2
ns
ns
%
Cload = 10 pF
Cload = 10 pF
Duty cycle
50
tH1,L1
tH0,L0
VS
163
ns
minimum/maximum pulse
duration with a level
above 90% or below 10%
and at fs = 48 kHz
SPDO
SPDO
326
ns
minimum/maximum pulse
duration with a level
above 90% or below 10%
and at fs = 48 kHz
Signal amplitude
VSUPD
t
t
R
F
t
t
H1
L1
Bit value = 1
Bit value = 0
t
t
L0
H0
t
P
Fig. 4–27: Timing of the S/PDIF output
4.6.2.6. PIO as Parallel Input Interface: DMA Mode
the controller. Please refer to Figure for the exact tim-
ing.
In decoding mode, the data transfer can be started
after the EOD pin of the MAS 35x9F is set to “high”.
After verifying this, the controller signalizes the send-
ing of data by activating the PR line. The MAS 35x9F
responds by setting the RTR line to the “low” level. The
MAS 35x9F reads the data PI[19:12] and sets RTR to
low after rising edge of PR. After RTR is set to high,
the mC sets PR to low. The next data word write oper-
ation will be initialized again by setting the PR line via
The procedure above will be repeated until the
MAS 35x9F sets the EOD signal to “0” which indicates
that the transfer of one data block has been executed.
Subsequently, the controller should set PR to “0”, wait
until EOD rises again and then repeat the procedure to
send the next block of data. The DMA buffer for MPEG
decoding is 30 bytes long. The size for G.729 is 10
bytes.
Micronas
June 30, 2004; 6251-505-1DS
77
MICRONAS [ MICRONAS ]
