参数资料
型号: MC9328MX21CJM
厂商: Freescale Semiconductor
文件页数: 96/100页
文件大小: 0K
描述: MPU I.MX21 289-MAPBGA
特色产品: MC9328MX21 Multimedia Processor
标准包装: 90
系列: i.MX21
核心处理器: ARM9
芯体尺寸: 32-位
速度: 266MHz
连通性: 1 线,EBI/EMI,I²C,IrDA,MMC,智能卡,SPI,SSI,UART/USART,USB OTG
外围设备: DMA,I²S,LCD,POR,PWM,WDT
输入/输出数: 192
程序存储器类型: ROMless
电压 - 电源 (Vcc/Vdd): 1.45 V ~ 3.3 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 289-LFBGA
包装: 托盘
产品目录页面: 732 (CN2011-ZH PDF)
Specifications
MC9328MX21 Technical Data, Rev. 3.4
Freescale Semiconductor
95
Figure 84. Sensor Output Data on Pixel Clock Rising Edge
CSI Latches Data on Pixel Clock Falling Edge
3.22.3
Calculation of Pixel Clock Rise/Fall Time
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 = 10ns, duty cycle = 50 / 50, hold time = 1ns, setup time = 1ns.
positive duty cycle = 10 / 2 = 5ns
≥ max rise time allowed = 5 - 1 = 4ns
negative duty cycle = 10 / 2 = 5ns
≥ max fall time allowed = 5 - 1 = 4ns
Falling-edge latch data
max fall time allowed = (negative duty cycle - hold time)
max rise time allowed = (positive duty cycle - setup time)
Table 46. Non-Gated Clock Mode Parameters1
1. HCLK = AHB System Clock, THCLK = Period of HCLK
Number
Parameter
Minimum
Maximum
Unit
1
csi_vsync to csi_pixclk
9 * THCLK
–ns
2
csi_d setup time
1
ns
3
csi_d hold time
1
ns
4
csi_pixclk high time
THCLK
–ns
5
csi_pixclk low time
THCLK
–ns
6
csi_pixclk frequency
0
HCLK / 2
MHz
1
VSYNC
PIXCLK
DATA[7:0]
2
3
6
5
4
Valid Data
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