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82374EB Datasheet(PDF) 134 Page - Intel Corporation |
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82374EB Datasheet(HTML) 134 Page - Intel Corporation |
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134 / 208 page  82374EB82374SB 643 TYPE ‘‘B’’ TIMING Type ‘‘B’’ timing is provided for 8-16-bit DMA devices which can accept faster IO timing Type ‘‘B’’ only works with fast system memory Type ‘‘B’’ timing runs at 6 BCLKs (720 nssingle cycle) and 4 BCLKs (480 ns cycle) during the repeated portion of a block or demand mode transfer Type ‘‘B’’ timing requires faster DMA slave devices than compatible timing in that the cycles are shortened so that the data setup time on IO write cycles is shortened and the IO read access time is required to be faster Some of the current ISA devices should be able to support type ‘‘B’’ timing but these will probably be more recent designs using relatively fast technology 290476 – 76 Figure 13 Type ‘‘B’’ DMA Read Transfer (4 BCLKS) 134 |
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