MAS3587F datasheet(70/82 Pages) MICRONAS

70 / 82 page

MAS 3587F

ADVANCE INFORMATION

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

Name

Min.

Max.

Unit

tst

PR, EOD

0.010

2000

µs

PR, RTR

160

tpd

PR,

PI[19:12]

120

480

tset

PI[19:12]

160

PI[19:12]

160

trtrq

RTR

200

30000

tpr

480

trpr

PR, RTR

160

teod

PR, EOD

160

teodq

EOD

2.5

500

µs

EOD

RTR

PI[19:12]

high

low

high

low

high

low

high

low

tst

trpr

trtrq

tset

tpr

tpd

teodq

teod

Byte 15

Byte 1

MAS 3509F latches the PIO DATA

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