MAS3587F datasheet(71/82 Pages) MICRONAS

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ADVANCE INFORMATION

MAS 3587F

Micronas

4.6.3.7. PIO as Parallel Output Interface:

DMA Mode

In encoding mode, the MAS 3587F signals available

data by setting the EOD pin to ”high”. After verifying

this, the controller signalizes its capability to receive

one byte of data by activating the PR line. The

MAS 3587F responds by setting the RTW line to the

“low” level when the actual byte is set on the data lines

PI[19:12]. After PR is set to “low” level, the RTW line is

set to “high” again. The next data word write operation

will be initialized again by setting the PR line via the

controller. Please refer to Fig. 4–27 on page 71 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

receive the next block of data. The DMA buffer is

15 bytes long.

The buffer size is subject to change in the next version.

In order to transfer the worst case data rate of

192 kbit/s, the controller must react sufficiently fast.

The mean response times (t0, t3, t5) must be faster

than

10 ms.

Due

internal

buffering

the

MAS 3587F, this time can be expanded up to 4.8 ms

once within each frame (see Table 2–2 on page 15) in

any case.

Fig. 4–27: Handshake protocol for reading MPEG data from the PIO-DMA

Table 4–5: PIO output mode timing

Symbol

Min.

Max.

Unit

EOD, PR

0.010

2000

µs

PR, PI

110

310

PI, RTW

RTW, PR

PR, RTW

260

RTW, PR

teod

tbd

teodq

2.5

EOD

RTW

PI[19:12]

high

low

high

low

high

low

high

low

teodq

teod

Byte 15

Byte 1

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