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如何读懂时序图.pdf

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如何读懂时序图.pdf
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http://blog.sina.com.cn/itangcle CPE/EE 421 Microcomputers WEEK #10 Interpreting the Timing Diagram 如何读懂时序图 The 68000 Read Cycle Alan Clements 2 Alan Clements 3 Actual behavior of a D flip - flop Timing Diagram of a Simple Flip - Flop Idealized form of the timing diagram Data hold time Data setup time Max time for output to become valid after clock 4 An alternative form of the timing diagram General form of the timing diagram Alan Clements The Clock • A microprocessor requires a clock that provides a stream of timing pulses to control its internal operations 一个微处理器需要时钟 ,提供一系列的计时脉冲来控制它的内部操作 • A 68000 memory access takes a minimum of eight clock states numbered from clock state S0 to clock state S7 一个 6800芯片 的储存器最小能过接收 8个从 S0到 S7的时钟脉冲 . 6 A memory access begins in clock state S0 and ends in state S7 Alan Clements Alan Clements 7 The most important parameter of the clock is the duration of a cycle, t CYC . Alan Clements 8 Address Timing 地址时序 • We are interested in when the 68000 generates a new address for use in the current memory access 我们感兴趣的是当 6800芯片 能够生成一个新的地址供当前的内存访问 • The next slide shows the relationship between the new address and the state of the 68000 ’s clock 下面展示的是新的地址跟 6800芯片时钟的关系 Alan Clements 1: S0在没有初始化的时候,地址总线总是包涵新的地址。 2: S1这个 状态说明一个新的地址可以供内存访问 Alan Clements Address Timing 地址时序 • Let’s look at the sequence of events that govern the timing of the address bus 让我们看看事件发生的顺序 ,管理时间的地址总线 • The “old” address is removed in state S0 旧的地址已经从 S0中移除 • The address bus is floated for a short time, and the CPU puts out a new address in state S1 地址要先存在一小段时间后, CPU才能把心的地址状态写入 S1中 12 Alan Clements Alan Clements 13 The old address is removed in clock state S0 and the address bus floated Alan Clements 我们感兴趣的是地址生效的那个时间点。这个时间是在 S0失效后, tCLAV秒后。 t CLAV The designer is interested in the point at which the address first becomes valid. This point is t CLAV seconds after the falling edge of S0. Alan Clements Address and Address Strobe 地址跟地址选通 • We are interested in the relation
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