
AT INTERFACE DESCRIPTION
PIO Timing
TIMING PARAMETERS | MODE 0 | MODE 1 | MODE 2 | MODE 3 | MODE 4 | |
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t0 | Cycle Time (min) | 600 ns | 383 ns | 240 ns | 180 ns | 120 ns |
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t1 | Address valid to | 70 ns | 50 ns | 30 ns | 30 ns | 25 ns |
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t2 | 165 ns | 125 ns | 100 ns | 80 ns | 70 ns | |
t2i |
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| 70 ns | 25 ns | |
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t3 | DIOW- data setup (min) | 60 ns | 45 ns | 30 ns | 30 ns | 20 ns |
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t4 | DIOW- data hold (min) | 30 ns | 20 ns | 15 ns | 10 ns | 10 ns |
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t5 | DIOR- data setup (min) | 50 ns | 35 ns | 20 ns | 20 ns | 20 ns |
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t6 | DIOW- data hold (min) | 5 ns | 5 ns | 5 ns | 5 ns | 5 ns |
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t6Z | DIOR- data tristate (max) | 30 ns | 30 ns | 30 ns | 30 ns | 30 ns |
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t9 | 20 ns | 15 ns | 10 ns | 10 ns | 10 ns | |
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tRd | Read Data Valid to IORDY active (min) | 0 | 0 | 0 | 0 | 0 |
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tA | IORDY Setup Time | 35 ns | 35 ns | 35 ns | 35 ns | 35 ns |
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tB | IORDY Pulse Width (max) | 1250 ns | 1250 ns | 1250 ns | 1250 ns | 1250 ns |
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Figure 5 - 2 |
PIO Data Transfer To/From Device
5 – 24