参数资料
型号: MAS3549F
厂商: MICRONAS SEMICONDUCTOR HOLDING AG
元件分类: Codec
英文描述: MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec
中文描述: 新加坡金融管理局35x9F的MPEG 2 / 3层,AAC音频解码器,G.729的附件A编解码器
文件页数: 80/92页
文件大小: 1186K
代理商: MAS3549F
MAS 35x9F
DATA SHEET
80
June 30, 2004; 6251-505-1DS
Micronas
4.6.2.8. PIO as Parallel Output Interface
Some downloadable software may use the PIO inter-
face (lines PI19...PI12) as output. The data transfer
rate and conditions are defines by the software func-
tion.
Handshaking for PIO output mode is accomplished
through the RTW, PCS, and PI12..PI19 signal lines
(see Fig. 4–30). The PR line has to be set to high level.
RTW will go low as soon as a byte is available in the
output buffer and will stay low until a byte has been
read. Reading of a byte is performed with a PCS
pulse. Data is latched out from the MAS on the falling
edge of PCS and removed from the bus on the rising
edge of PCS.
Fig. 4–30:
Output timing
Table 4–12:
PIO output mode timing
Symbol
Pin
Min.
Max.
Unit
t
0
RTW, PCS
0.010
1800
μ
s
t
1
PCS
0.330
μ
s
t
2
PCS, RTW
0.010
μ
s
t
3
RTW
0.330
10000
μ
s
t
4
PI
0.330
μ
s
t
5
PI
0.081
μ
s
RTW
PIxx
PCS
t
3
t
0
t
1
t
2
t
4
t
5
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