MAS3549F datasheet(80/92 Pages) MICRONAS

部件名	MAS3549F

功能描述	MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec

PDF	92 Pages

Scroll/Zoom	100%

制造商	MICRONAS [Micronas]

网页	http://www.micronas.com

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80 / 92 page

MAS 35x9F

DATA SHEET

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

Min.

Max.

Unit

RTW, PCS

0.010

1800

µs

PCS

0.330

µs

PCS, RTW

0.010

µs

RTW

0.330

10000

µs

0.330

µs

0.081

µs

RTW

PIxx

PCS

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