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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DSP56857 датащи(PDF) 141 Page - Freescale Semiconductor, Inc |
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DSP56857 датащи(HTML) 141 Page - Freescale Semiconductor, Inc |
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141 / 662 page  Timing Specifications External Memory Interface (EMI), Rev. 4 Freescale Semiconductor 5-15 Note: INT_SYS_CLK is the internal system clock from which everything is referenced. Figure 5-9. External Read Cycle with RWS = 1, RWSH = 0 and RWSS = 0 5.7.1.2 Read Setup and Hold Timing Although most memory devices can perform consecutive reads by holding the CSn and RD(OE) signals in the active state and changing the address, there are peripheral devices that require RD(OE) to transition to the inactive state between reads of certain registers. This timing can be accommodated with the Read Setup (RWSS) and/or Read Hold (RWSH) control fields illustrated in Figure 5-10 and Figure 5-11. Time added to Figure 5-8 by setting RWS = 1 tACCESS tOHZ tACCESS tOEV tRH tRL tCSV tAV tAV tRDH tCSRH tCLKA tRC Read (RWS = 1) Read (RWS = 1) IDLE tC tRSD tRSDP tRSD tRSDP tRHD tRSD tRSDP Data In Data In Data In int_sys_clk int_sys_clk_delay A[23:0], PS, DS CS[7:0] RD , OE WR D[15:0] Read (RWS = 1) |
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