參數(shù)資料
型號: NS32FX200VF
廠商: National Semiconductor Corporation
英文描述: System Controller
中文描述: 系統(tǒng)控制器
文件頁數(shù): 19/94頁
文件大?。?/td> 955K
代理商: NS32FX200VF
2.0 Architecture
(Continued)
2.4.2.1 Scanner Signals Generator Block
This block generates the timing control signals required by
CIS and CCD scanners. Scanners with line scan time of
2.5 ms, 5 ms, 10 ms or 20 ms are supported. This period is
derived from the TCU module’s time-slots (generated by the
TCU dividing each 20 ms into 256 time-slots).
The block generates the following signals:
D Scanner Period Pulse (SPP), an internal synchronization
pulse.
D Scanner Pixel Clock (SPCLK), an internal pixel clock (its
frequency is twice the scanner clock).
D Pixel clocks (two phasesDSCLK1 and SCLK2).
D Integrator Discharge Pulse (SDIS).
D Sample and Hold control clock (SNH). Used to sample
the scanner analog video signal.
D Scan Line Synchronization Pulse (SLS). Indicates the
beginning of a scan line.
D Scanner Comparator Preset, an internal initialization sig-
nal for the on-chip analog comparator.
D Active window, an internal time frame that controls the
operation of the bitmap generator.
D Peak Detector Window (SPDW). One of the Automatic
Background Control (ABC) control signals.
D Scanner interrupt pulse.
D Scanner motor interrupt pulse.
Each signal is generated by an independently programmed
waveform generator. The flexible waveform definition facili-
tates the support of different scanner models.
TL/EE/11331–11
FIGURE 2-6. Block Diagram of Scanner’s Signals Generator Block
19
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