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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP8420V датащи(PDF) 9 Page - National Semiconductor (TI) |
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DP8420V датащи(HTML) 9 Page - National Semiconductor (TI) |
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9 / 60 page  30 Programming and Resetting (Continued) 32 PROGRAMMING METHODS 321 Mode Load Only Programming To use this method the user asserts ML enabling the inter- nal programming register After ML is asserted a valid pro- gramming selection is placed on the address bus B0 B1 and ECAS0 inputs then ML is negated When ML is negat- ed the programming bits are latched into the internal pro- gramming register and the DP8420V21V22V DP84T22 is programmed see Figure 6 When programming the chip the controller must not be refreshing RFIP must be high (1) to have a successful programming 322 Chip Selected Access Programming The chip can also be programmed by performing a chip selected access To program the chip using this method ML is asserted then CS is asserted and a valid program- ming selection is placed on the address bus When AREQ is asserted the programming bits affecting the wait logic be- come effective immediately then DTACK is asserted allow- ing the access to terminate After the access ML is negated and the rest of the programming bits take effect TLF11109 – 7 FIGURE 6 ML Only Programming TLF11109 – 8 FIGURE 7 CS Access Programming 9 |
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