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AR0130CS Datasheet(PDF) 11 Page - ON Semiconductor |
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AR0130CS Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 39 page  AR0130CS www.onsemi.com 11 LV and FV The timing of the FV and LV outputs is closely related to the row time and the frame time. FV will be asserted for an integral number of row times, which will normally be equal to the height of the output image. LV will be asserted during the valid pixels of each row. The leading edge of LV will be offset from the leading edge of FV by 6 PIXCLKs. Normally, LV will only be asserted if FV is asserted; this is configurable as described below. LV Format Options The default situation is for LV to be de−asserted when FV is de−asserted. By configuring R0x306E[1:0], the LV signal can take two different output formats. The formats for reading out four lines and two vertical blanking lines are shown in Figure 10. Figure 10. LV Format Options Default Continuous LV FV LV FV LV The timing of an entire frame is shown in Figure 11: “Line Timing and FRAME_VALID/LINE_VALID Signals”. Frame Time The pixel clock (PIXCLK) represents the time needed to sample 1 pixel from the array. The sensor outputs data at the maximum rate of 1 pixel per PIXCLK. One row time (tROW) is the period from the first pixel output in a row to the first pixel output in the next row. The row time and frame time are defined by equations in Table 4. Figure 11. Line Timing and FRAME_VALID/LINE_VALID Signals Table 4. FRAME TIME (Example Based on 1280 x 960, 45 Frames Per Second) Parameter Name Equation Timing at 74.25 MHz A Active data time Context A: R0x3008 − R0x3004 + 1 Context B: R0x308E − R0x308A + 1 1280 pixel clocks = 17.23 ms P1 Frame start blanking 6 (fixed) 6 pixel clocks = 0.08 ms P2 Frame end blanking 6 (fixed) 6 pixel clocks = 0.08 ms Q Horizontal blanking R0x300C − A 370 pixel clocks = 4.98 ms A+Q (tROW) Line (Row) time R0x300C 1650 pixel clocks = 22.22 ms V Vertical blanking Context A: (R0x300A−(R0x3006−R0x3002+1)) x (A + Q) Context B: ((R0x30AA−(R0x3090−R0x308C+1)) x (A + Q) 49,500 pixel clocks = 666.66 ms |
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