参数资料
型号: MC9328MX21CVH
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 266 MHz, MICROPROCESSOR, PBGA289
封装: 17 X 17 MM, 1.45 MM HEIGHT, 0.80 MM PITCH, MAPBGA-289
文件页数: 4/106页
文件大小: 1932K
代理商: MC9328MX21CVH
Specifications
MC9328MX21 Product Preview, Rev. 1.1
Freescale Semiconductor
101
HCLK = AHB System Clock
THCLK = Period of HCLK
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)
5
csi_pixclk low time
THCLK
–ns
6
csi_pixclk frequency
0
HCLK / 2
MHz
Table 44. Non-Gated Clock Mode Parameters (Continued)
Number
Parameter
Minimum
Maximum
Unit
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