參數(shù)資料
型號: MCIMX27
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Multimedia Applications Processor(多媒體應(yīng)用處理器)
中文描述: 多媒體應(yīng)用處理器(多媒體應(yīng)用處理器)
文件頁數(shù): 52/118頁
文件大小: 1159K
代理商: MCIMX27
i.MX27 Data Sheet, Advance Information, Rev. 0.1
52
Preliminary—Subject to Change Without Notice
Freescale Semiconductor
Signal Descriptions
HCLK = AHB System Clock, THCLK = Period for HCLK, Tp = Period of CSI_PIXCLK
The limitation on pixel clock rise time/fall time is not specified. It should be calculated from the hold
time and setup time based on the following assumptions:
Rising-edge latch data:
max rise time allowed = (positive duty cycle
hold time)
max fall time allowed = (negative duty cycle
setup time)
In most of case, duty cycle is 50/50, therefore:
max rise time = (period/2
hold time)
max fall time = (period/2
setup time)
For example: Given pixel clock period = 10 ns, duty cycle = 50/50, hold time = 1 ns, setup time = 1 ns.
positive duty cycle = 10/2 = 5 ns
max rise time allowed = 5 –1 = 4 ns
negative duty cycle = 10/2 = 5 ns
max fall time allowed = 5 –1 = 4 ns
Falling-edge latch data:
max fall time allowed = (negative duty cycle
hold time)
max rise time allowed = (positive duty cycle
setup time)
3.5.5.2
Non-Gated Clock Mode Timing
In non-gated mode only, the VSYNC, and PIXCLK signals are used; the HSYNC signal is ignored. Figure
3 and Figure 4 show the different clock edge timing of CSI and Sensor in Non-Gated Mode. Table 3 is the
parameter value.
Figure 11
and
Figure 12
show the non-gated clock mode timings of CSI, and
Table 21
lists the timing parameters.
Figure 11
shows sensor output data on the pixel clock falling edge. The CSI latches data on the pixel clock
rising edge.
Table 20. Gated Clock Mode Timing Parameters
Number
Parameter
Minimum
Maximum
Unit
1
csi_vsync to csi_hsync
9*T
HCLK
ns
2
csi_hsync to csi_pixclk
3
(Tp/2)-3
ns
3
csi_d setup time
1
ns
4
csi_d hold time
1
ns
5
csi_pixclk high time
T
HCLK
ns
6
csi_pixclk low time
T
HCLK
ns
7
csi_pixclk frequency
0
HCLK/2
MHz
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