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GS9090B Datasheet(PDF) 29 Page - Gennum Corporation |
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GS9090B Datasheet(HTML) 29 Page - Gennum Corporation |
29 / 71 page ![]() GS9090B Data Sheet 40749 - 2 January 2007 29 of 71 3.6.4 HVF Timing Signal Generation The GS9090B extracts timing parameters, and outputs them to the F, V and H pins, from either the received TRS signals (FW_EN = LOW) or from the internal flywheel-timing generator (FW_EN = HIGH). Horizontal blanking period (H), vertical blanking period (V), and field odd / even timing (F) are extracted and are available for output on any of the multi-function output port pins, if so programmed (see Section 3.12). The H signal timing is configurable via the H_CONFIG bit of the internal IOPROC_DISABLE register as either active line-based blanking, or TRS-based blanking (see Table 3-14 in Section 3.9.8). Active line-based blanking is enabled when the H_CONFIG bit is set LOW. In this mode, the H output is HIGH for the entire horizontal blanking period, including the EAV and SAV TRS words. This is the default H timing used by the device. When H_CONFIG is set HIGH, TRS based blanking is enabled. In this case, the H output will be HIGH for the entire horizontal blanking period as indicated by the H bit in the received TRS ID words. The timing of these signals is shown in Figure 3-3. NOTE 1: When the internal FIFO is configured for video mode, the H, V, and F signals will be timed to the data output from the FIFO (see Section 3.10.1). NOTE 2: When the GS9090B is configured for Low-latency mode, the H, V, and F output timing will be TRS-based as shown in Section 3.13. Active line-based timing is not available in this mode, and the setting of the H_CONFIG host interface bit will be ignored. Figure 3-3: H,V,F Timing Y/Cr/Cb DATA OUT PCLK H V F XYZ (eav) 000 000 3FF XYZ (sav) 000 000 3FF H SIGNAL TIMING: H_CONFIG = LOW H_CONFIG = HIGH |
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