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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP8432V датащи(PDF) 36 Page - National Semiconductor (TI) |
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DP8432V датащи(HTML) 36 Page - National Semiconductor (TI) |
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36 / 56 page  100 Dual Accessing (DP8432V) (Continued) Since the DP8432V has only one set of address inputs the signal is used with the addition of buffers to allow the cur- rently granted port’s addresses to reach the DP8432V The signals which need to be bufferred are R0 – 10 C0 – 10 B0 – 1 ECAS0–3 WE and LOCK All other inputs are not common and do not have to be buffered as shown in Figure 32a If a Port which is not currently granted tries to access the DRAM array the GRANTB output will transition from a rising clock edge from AREQ or AREQB negating and will precede the RAS for the access by one or two clock peri- ods GRANTB will then stay in this state until the other port requests an access and the currently granted port is not accessing the DRAM as shown in Figure 32b TLF11118 – 53 If Port B is synchronous the Request Synchronizing logic will not be required FIGURE 32a Dual Accessing with the DP8432V (System Block Diagram) 36 |
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