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MAS3587F Datasheet(PDF) 70 Page - Micronas

Part # MAS3587F
Description  Audio Encoder/Decoder
PDF  82 Pages
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Manufacturer  MICRONAS [Micronas]
Direct Link  http://www.micronas.com
Logo MICRONAS - Micronas

MAS3587F Datasheet(HTML) 70 Page - Micronas

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MAS 3587F
ADVANCE INFORMATION
70
Micronas
4.6.3.6. PIO as Parallel Input Interface: DMA Mode
In decoding mode, the data transfer can be started
after the EOD pin of the MAS 3587F is set to “high”.
After verifying this, the controller signalizes the send-
ing of data by activating the PR line. The MAS 3587F
responds by setting the RTR line to the “low” level. The
MAS 3587F 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 controller. Please refer to Figure 4–26 for the exact
timing
The procedure above will be repeated until the
MAS 3587F 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 is
15 bytes long.
The buffer size is subject to change in the next version.
.
Fig. 4–26: Handshake protocol for writing MPEG data to the PIO-DMA
Symbol
Pin
Name
Min.
Max.
Unit
tst
PR, EOD
0.010
2000
µs
tr
PR, RTR
40
160
ns
tpd
PR,
PI[19:12]
120
480
ns
tset
PI[19:12]
160
ns
th
PI[19:12]
160
ns
trtrq
RTR
200
30000
ns
tpr
PR
480
ns
trpr
PR, RTR
160
ns
teod
PR, EOD
40
160
ns
teodq
EOD
2.5
500
µs
EOD
PR
RTR
PI[19:12]
high
low
high
low
high
low
high
low
tst
trpr
trtrq
tset
th
tr
tpr
tpd
teodq
teod
Byte 15
Byte 1
MAS 3509F latches the PIO DATA



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