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ST10F271B データシート(PDF) 164 Page - STMicroelectronics |
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ST10F271B データシート(HTML) 164 Page - STMicroelectronics |
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164 / 180 page  Electrical characteristics ST10F271B/ST10F271E 164/180 1. RW-delay and tA refer to the next following bus cycle. 2. Read data are latched with the same clock edge that triggers the address change and the rising RD edge. Therefore address changes before the end of RD have no impact on read cycles. 3. Partially tested, guaranteed by design characterization. t38 CC ALE falling edge to Latched CS – 4 – tA 6 – tA – 4 – tA 6 – tA ns t39 SR Latched CS low to Valid Data In – 16.5 + + tC + 2tA – 3TCL – 21 + + tC + 2tA ns t41 CC Latched CS hold after RD, WR 2 + tF – TCL – 10.5 + tF –ns t82 CC Address setup to RdCS, WrCS (with RW-delay) 14 + 2tA – 2TCL – 11 + 2tA –ns t83 CC Address setup to RdCS, WrCS (no RW-delay) 2 + 2tA – TCL –10.5 + 2tA –ns t46 SR RdCS to Valid Data In (with RW-delay) –4 + tC – 2TCL – 21 + tC ns t47 SR RdCS to Valid Data In (no RW-delay) –16.5 + tC – 3TCL – 21 + tC ns t48 CC RdCS, WrCS Low Time (with RW-delay) 15.5 + tC – 2TCL – 9.5 + tC –ns t49 CC RdCS, WrCS Low Time (no RW-delay) 28 + tC – 3TCL – 9.5 + tC –ns t50 CC Data valid to WrCS 10 + tC – 2TCL – 15 + tC –ns t51 SR Data hold after RdCS 0– 0 – ns t53 SR Data float after RdCS (with RW-delay) 3 –16.5 + tF – 2TCL – 8.5 + tF ns t68 SR Data float after RdCS (no RW-delay) 3 –4 + tF – TCL – 8.5 + tF ns t55 CC Address hold after RdCS, WrCS – 8.5 + tF –– 8.5 + tF –ns t57 CC Data hold after WrCS 2 + tF – TCL – 10.5 + tF –ns Table 78. Demultiplexed bus timings (continued) Symbol Parameter FCPU = 40 MHz TCL = 12.5 ns Variable CPU Clock 1/2 TCL = 1 to 64MHz min. max. min. max. |
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