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GS9090B Datasheet(PDF) 49 Page - Gennum Corporation |
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GS9090B Datasheet(HTML) 49 Page - Gennum Corporation |
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49 / 71 page  GS9090B Data Sheet 40749 - 2 January 2007 49 of 71 DVB_ASI pin is set HIGH (i.e. the device is in DVB-ASI mode); however, the FIFO_MODE[1:0] bits may be programed as required. Figure 3-10 shows the input and output signals of the FIFO when it is configured for DVB-ASI Mode. Figure 3-10: FIFO in DVB-ASI Mode When operating in DVB-ASI mode, the GS9090B's FIFO can be used for clock rate interchange operation. The extracted 8-bit MPEG packets will be written into the FIFO at 27MHz based on the SYNCOUT signal from the internal DVB-ASI decoder block. The SYNCOUT and WORDERR bits are also stored in the FIFO (see Section 3.7.2). When SYNCOUT goes HIGH, K28.5 stuffing characters have been detected and no data will be written into the FIFO. Data is read out of the FIFO using the RD_CLK pin. In DVB-ASI mode, the RD_RESET pin is not used. NOTE: With the internal FIFO enabled in DVB-ASI mode, SYNCOUT will always be LOW since the K28.5 sync characters are not stored in the FIFO. 3.10.2.1 Reading From the FIFO The FIFO contains internal read and write pointers used to designate which spot in the FIFO the MPEG packet will be read from or written to. These internal pointers control the status flags FIFO_EMPTY and FIFO_FULL, which are available for output on the multi-function output port pins, if so programmed (see Section 3.12). In the case where the write pointer is originally ahead of the read pointer, the FIFO_EMPTY flag will be set HIGH when both pointers arrive at the same address (see block A in Figure 3-12). This flag can be used to determine when to stop reading from the device. A write and read pointer offset may be programmed in the FIFO_EMPTY_OFFSET[9:0] register of the host interface. If an offset value is programmed in this register, the FIFO_EMPTY flag will be set HIGH when the read and write pointers of the FIFO are at the same address, and will remain HIGH until WR_CLK (PCLK gated with SYNCOUT) SYNCOUT WORDERR FIFO (DVB-ASI Mode) RD_CLK 8-bit MPEG Data 8-bit MPEG Data WORDERR SYNCOUT FIFO_FULL FIFO_EMPTY Internal Application Interface |
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