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M66335FP Datasheet(PDF) 11 Page - Renesas Technology Corp |
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M66335FP Datasheet(HTML) 11 Page - Renesas Technology Corp |
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11 / 59 page  M66335FP REJ03F0276-0200 Rev.2.00 Jun 16, 2008 Page 11 of 58 (2) Line Cycle and Reading Sequence The relationship between the line cycle and the reading sequence of the M66335 is shown in figure 1. The relationship between the CODEC interface operations and the reading sequence is shown in figure 2 and that between the DMA interface operations and the reading sequence is shown in figure 3. • Single-line cycle (1/ACCK) Defines the processing time per line of the M66335. The single-line cycle is decided by the line cycle counter value registers 03 and 04 (PRE_DATA), and the pixel transfer clock. The pixel transfer clock is 1/16 of SYSCK. 1 line cycle (1/ACCK) [NS] = line cycle counter value × pixel transfer clock cycle [NS] = (PRE_DATA + 1) × pixel transfer clock cycle [NS] = (PRE_DATA + 1) × 16/SYSCK [NS] After loading the PRE_DATA value, the line cycle counter generates the addresses of the following gate signals while counting down with the pixel transfer clock. • Sensor start pulse (SH) Image sensor start pulse. The point of the start pulse is decided by the uniformity correction range (UNIFG) and the value of the register 05. [ST_PL] The ST_PL value must be set according to the following formulas for each image sensor type. CCD: ST_PL = dummy pixels of the sensor + 2 CIS: ST_PL = 2 • Uniformity correction range (UNIFG) Defines the range where uniformity correction is performed. This range corresponds to the width of the sensor (B4 to A4). For the relationship between the sensor width and the uniformity correction range, see table 2. • AGC range (AGCG) Defines the range where peak value detection is performed. This range corresponds to the sensor width (B4 to A4). Auto gain control is performed for the whole width of the sensor (solid line) in the AGC mode and for the narrower width (dashed line) than the sensor width in the SCAN mode. For the relationship between the sensor width and the AGC range, see table 2. • Original sheet reading width Defines the reading width for original sheets. For original sheet widths narrower than the sensor width, the reading range (dashed line) is set, using the sensor center as the base center point. Therefore, the points for the original sheet should be based on the sensor center. For the relationship between the sensor width and the original sheet reading width, see table 3. • Pulse motor control signal (PTIM) Generates control signals for the pulse motor for the reading roller. |
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