08 2017 档案

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posted @ 2017-08-29 11:42 KevinChase 阅读(431) 评论(0) 推荐(0)
摘要:一、SPI Modes Serial Peripheral Interface Bus At CPOL=0 the base value of the clock is zero, i.e. the idle state is 0 and active state is 1. For CPHA=0, 阅读全文
posted @ 2017-08-22 20:34 KevinChase 阅读(459) 评论(0) 推荐(0)
摘要:i2c协议规范: 一、时钟 首先第一步是产生fast-mode的400khz的scl速率,假设方波高低电平各占一半,即1.25us,理论上不满足规范上scl低周期1.3us,但是绝大多数器件都支持稍微超过400khz的速率。 我们仍打算产生一个规范内的速率。输入时钟clk=20mhz,计数12+1次 阅读全文
posted @ 2017-08-22 14:39 KevinChase 阅读(2584) 评论(0) 推荐(0)
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posted @ 2017-08-15 14:53 KevinChase 阅读(231) 评论(0) 推荐(0)
摘要:一、选择风扇类型:Qualtek FAD1-06020CSHW11 12V/0.16A 只有VCC和GND两根线外接,内部采用AH276霍尔磁性传感器。(DIODES or Anachip) 实测数值: 12V-85mA 11V-78mA 10V-72mA 9V-66mA 8V-59mA 7V-53 阅读全文
posted @ 2017-08-07 14:51 KevinChase 阅读(4309) 评论(0) 推荐(0)
摘要:# # IOSTANDARD Constraints## Note that these IOSTANDARD constraints are applied to all IOs currently# assigned within an I/O bank. If these IOSTANDARD 阅读全文
posted @ 2017-08-01 13:31 KevinChase 阅读(995) 评论(0) 推荐(0)