MAS3504D datasheet(9/40 Pages) MICRONAS

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MAS 3504D

Micronas

2.6.3. Parallel Data Input

In decoding mode, PIO lines PI12...PI19 are switched

to the MAS 3504D data input which hence will be an 8-

bit parallel input port with MSB first (at position PI19)

for the G.729 bit stream data. In order to write data to

this parallel port, a special handshake protocol has to

be used by the controller (see Fig. 2–4).

2.6.3.1. DMA Handshake Protocol

The data transfer can be started after the EOD pin of

the MAS 3504D is set to high. After verifying this, the

controller indicates the transmission of data by activat-

ing the PR line. The MAS 3504D responds by setting

the RTR line to the low level. The MAS 3504D reads

the data PI[19:12] after the rising edge of the PR. The

next data word write operation will again be initialized

by setting the PR line via the controller. Please refer to

Figure 2–4 and Table 2–2 for the exact timing.

Fig. 2–4: Handshake protocol for writing G.729 data to the PIO-DMA

Table 2–1: PIO Output Mode Timing1)

Symbol

Pin Name

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

1) see Figure 2–3

EOD

RTR

PI[19:12]

high

low

high

low

high

low

high

low

tst

trpr

trtrq

tset t

tpr

tpd

teodq

teod

Byte 15

Byte 1

MAS 3504D latches the PIO DATA

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