MAS3504D Ver la hoja de datos (PDF) - Micronas
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MAS3504D Datasheet PDF : 40 Pages
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MAS 3504D
2.6.3.2. End of DMA Transfer
The above procedure will be repeated until the
MAS 3504D sets the EOD signal to “0”, which indi-
cates that the transfer of one data block has been exe-
cuted. Subsequently, the controller should set PR to
“0”, wait until EOD rises again, and then repeat the
procedure ((see Section 2.6.3.1. on page 9)) to send
the next block of data. The DMA buffer is 10 bytes long
(one frame).
The recommended PIO DMA conditions and the char-
acteristics of the PIO timing are given in Table 2–2.
Table 2–2: PIO DMA Timing
Symbol PIO Pin
tst
PR, EOD
tr
PR, RTR
tpd
PR,
PI[19:12]
tset
th
trtrq
tpr
trpr
teod
teodq
PI[19:12]
PI[19:12]
RTR
PR
PR, RTR
PR, EOD
EOD
Min.
0.010
40
120
160
160
200
480
40
40
2.5
Max.
Unit
2000
µs
160
ns
480
ns
no limit ns
no limit ns
30000 ns
no limit ns
no limit ns
160
ns
500
µs
2.6.4. Audio Input Interface (SDI)
The A/D interface is a standard I2S interface (16/32 bit,
stereo). This input is used for G.729 recording mode
and must be slaved to the D/A output clock and word-
strobe signals.
The interface is configurable by software to work in dif-
ferent modes. It is possible to choose:
– inverted or non inverted word strobe (SOI),
– no delay or delay of data related to word strobe
– inverted or non inverted I2S-Clock (SOC).
For further details see Section 3.5.4. on page 18
2.6.5. Audio Output Interface (SDO)
The audio output interface of the MAS 3504D is a
standard I2S interface. As the G.729 standard is only
working on mono signals, the same signal is written to
both output channels (left and right).
The interface is configurable by software to work in dif-
ferent modes. It is possible to choose:
– 16 or 32 bit/sample modes,
– inverted or non inverted word strobe (SOI),
– no delay or delay of data related to word strobe
– inverted or non inverted I2S-clock (SOC).
For further details see Section 3.5.4. on page 18
10
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