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DS3134 Datasheet(PDF) 171 Page - Dallas Semiconductor |
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DS3134 Datasheet(HTML) 171 Page - Dallas Semiconductor |
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171 / 203 page  DS3134 171 of 203 10.3 EXAMPLES OF BUS TIMING FOR LOCAL BUS PCI BRIDGE MODE OPERATION Figure 10.3A 8-Bit Read Cycle Intel Mode (LIM = 0) Arbitration Enabled (LARBE = 1) Bus Transaction Time = 4 LCLK (LRDY = 0100) An attempted access by the Host causes the Local Bus to request the bus. If bus access has not been granted (LBGACK* deasserted), then the timing shown at the top of the page will occur with LHOLD being asserted and then once LHLDA is detected, the Local Bus will grab the bus for 32 to 1048576 clocks and then release it. If the bus has already been granted (LBGACK* asserted), then the timing shown at the bottom of the page will occur. Note: LA / LD / LBHE* / LWR* / LRD* are tri-stated. LCLK LHOLD LHLDA LBGACK* 32 to 1048576 LCLKs lb pi LA[19:0] LD[7:0] LD[15:8] LRD* LWR* Address Valid LBHE* tri-state tri-state tri-state tri-state LCLK 12 34 |
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