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MAS3507D Datasheet(PDF) 12 Page - Micronas |
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MAS3507D Datasheet(HTML) 12 Page - Micronas |
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12 / 60 page  MAS 3507D PRELIMINARY DATA SHEET 12 Micronas 2.7.3. Parallel Input Output Interface (PIO) The parallel interface of the MAS 3507D uses the lines PI0...PI4, PI8, PI12...PI19, and several control lines. 2.7.3.1. PIO-DMA Input Mode By setting the PIO pin PI4 to “1”, the PIO-DMA input mode of the MAS 3507D is activated after reset. Normally, the input mode should not be altered in a customer’s application. Should this nonetheless be desired, the necessary changes are described in Table 2–4 and Table 2–5. 2.7.3.2. Writing MPEG Data to the PIO-DMA The PIO-DMA mode enables the writing of 8-bit paral- lel MPEG data to the MAS 3507D. In this mode, PIO lines PI19...PI12 are switched to the MAS 3507D data input which hence will be an 8-bit parallel input port with MSB first (at position PI19) for the MPEG bit stream data. In order to write data to this parallel port successfully, a special handshake protocol has to be used by the controller (see Fig. 2–5). Note: Either SII has to be set to “1”, or SIC clock input has to be stopped (“0”) in this mode. . . Fig. 2–5: Handshake protocol for writing MPEG data to the PIO-DMA Table 2–4: Switching from SDI- to PIO-DMA-Input Address 1) Value $e6, Bit 4 1 1) Startup Configuration Register Table 2–5: Switching from PIO-DMA- to SDI-Input Step Address 1) Value 1 $e6, Bit 4 0 2 $4b $82 1) PIO Configuration Register Note: These 2 steps must be done in above order! EOD PR RTR PI[19:12] high low high low high low high low tst trpr trtrq tset th tr tpr tpd teodq teod Byte 15 Byte 1 MAS 3507D latches the PIO DATA |
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