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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M7020R датащи(PDF) 117 Page - STMicroelectronics |
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M7020R датащи(HTML) 117 Page - STMicroelectronics |
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117 / 150 page  117/150 M7020R Figure 86. Multi-Width Configurations Example LRAM AND LDEV DESCRIPTION When search engines are cascaded using multiple M7020Rs, the SADR, CE_L, and WE_L (3-state signals) are all tied together. In order to eliminate external pull-up and pull-downs, one device in a bank is designated as the default driver. For non- SEARCH or non-LEARN cycles (see LEARN COMMAND in the section below) or search cycles with a global miss, the SADR, CE_L, and WE_L signals are driven by the device with the LRAM Bit set. Note: It is important that only one device in a bank of search engines that are cascaded have this bit set. Failure to do so will cause contention on SADR, CE_L, WE_L, and can potentially cause damage to the device(s). Similarly, when search engines using multiple M7020Rs are cascaded, SSF and SSV (also 3- state signals) are tied together. In order to elimi- nate external pull-up and pull-downs, one device in a bank is designated as the default driver. For non-SEARCH cycles or SEARCH cycles with a global miss the SSF and SSV signals are driven by the device with the LDEV Bit set. Note: It is important that only one device in a bank of search engines that are cascaded together have this bit set. Failure to do so will cause conten- tion on SSV and SSF and can potentially cause damage to the device(s). 16 K 4 K 2 K 68 136 272 CFG = 10 01 00 00 AI06314 |
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