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GS9092A Datasheet(PDF) 35 Page - Gennum Corporation |
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GS9092A Datasheet(HTML) 35 Page - Gennum Corporation |
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35 / 63 page  GS9092A GenLINX® III 270Mb/s Serializer for SDI and DVB-ASI Data Sheet 34715 - 4 May 2010 35 of 63 3.3.4 Bypass Mode The internal FIFO is in bypass mode when the application layer sets the FIFO_EN or IOPROC_EN pin LOW, or the FIFO_MODE[1:0] bits in the IOPROC_DISABLE register are configured to 11b. By default, the FIFO_MODE[1:0] bits are set to 11b by the device whenever both the SMPTE_BYPASS and DVB_ASI pins are LOW; however, the application layer may program the FIFO_MODE[1:0] bits as required. In bypass mode, the FIFO is not inserted into the video path and data is presented to the input of the device synchronously with the PCLK input. The FIFO will be disabled and placed in static mode to save power. 3.4 SMPTE Mode The GS9092A enters SMPTE mode when the SMPTE_BYPASS pin is set HIGH and the DVB_ASI pin is set LOW. In this mode, the parallel data will be scrambled according to SMPTE 259M and NRZ-to-NRZI encoded prior to serialization. 3.4.1 I/O Status Signals When DETECT_TRS is LOW, the device will be locked to the externally supplied H, V, and F signals. When DETECT_TRS is HIGH, the device will be locked to the embedded TRS signals in the parallel input data. The H, V, and F pins become output status signals, and their timing will be based on embedded TRS words. 3.4.2 HVF Timing Signal Inputs As discussed above, the GS9092A's internal flywheel may be locked to externally provided H, V, and F signals when DETECT_TRS is set LOW by the application layer. The H signal timing may be configured via the H_CONFIG bit of the internal IOPROC_DISABLE register as either active line-based blanking or TRS-based blanking (see Table 3-4 in Packet Generation and Insertion on page 38). The default setting of this bit (after RESET has been asserted) is LOW. Active line-based blanking is enabled when the H_CONFIG bit is set LOW. In this mode, the H input should be HIGH for the entire horizontal blanking period, including the EAV and SAV TRS words. This is the default H timing assumed by the device. When H_CONFIG is set HIGH, TRS-based blanking is enabled. In this case, the H input should be set HIGH for the entire horizontal blanking period as indicated by the H bit in the associated TRS words. The timing of these signals is shown in Figure 3-8. When the DETECT_TRS pin is set HIGH, the output timing on the H pin can be selected as either active line-based or TRS-based. |
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