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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN9115 датащи(PDF) 101 Page - Microchip Technology |
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LAN9115 датащи(HTML) 101 Page - Microchip Technology |
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101 / 114 page  2005-2016 Microchip Technology Inc. DS00002269A-page 101 LAN9115 6.6 PIO Writes PIO writes are used for all LAN9115 write cycles. PIO writes can be performed using Chip Select (nCS) or Write Enable (nWR). Either or both of these control signals must go high between cycles for the period specified. FIGURE 6-6: PIO WRITE CYCLE TIMING Note: The “Data Bus” width is 16 bits. TABLE 6-6: PIO WRITE CYCLE TIMING Symbol Description MIN TYP MAX Units tcycle Write Cycle Time 165 ns tcsl nCS, nWR Assertion Time 32 ns tcsh nCS, nWR Deassertion Time 13 ns tasu Address Setup to nCS, nWR Assertion 0 ns tah Address Hold Time 0 ns tdsu Data Setup to nCS, nWR Deassertion 7 ns tdh Data Hold Time 0 ns Note: A PIO Write cycle begins when both nCS and nWR are asserted. The cycle ends when either or both nCS and nWR are deasserted. They may be asserted and deasserted in any order. Data Bus nCS, nWR A[7:1] |
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