参数资料
型号: MAS3587F
厂商: Electronic Theatre Controls, Inc.
元件分类: 通用总线功能
英文描述: MPEG Layer 3 Audio Encoder/Decoder
中文描述: MPEG层3音频编码器/解码器
文件页数: 70/83页
文件大小: 734K
代理商: MAS3587F
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
t
st
PR, EOD
0.010
2000
μ
s
t
r
PR, RTR
40
160
ns
t
pd
PR,
PI[19:12]
120
480
ns
t
set
PI[19:12]
160
ns
t
h
PI[19:12]
160
ns
t
rtrq
RTR
200
30000
ns
t
pr
PR
480
ns
t
rpr
PR, RTR
160
ns
t
eod
PR, EOD
40
160
ns
t
eodq
EOD
2.5
500
μ
s
EOD
PR
RTR
PI[19:12]
high
low
high
low
high
low
high
low
t
st
t
rpr
t
rtrq
t
set
t
h
t
r
t
pr
t
pd
t
eodq
t
eod
Byte 15
Byte 1
MAS 3509F latches the PIO DATA
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