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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LC823450 датащи(PDF) 72 Page - ON Semiconductor |
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LC823450 датащи(HTML) 72 Page - ON Semiconductor |
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72 / 112 page  LC823450 www.onsemi.com 72 External Memory Bus Write Figure 18. AC Characteristics − External Memory Bus Write Timing PHI (ARM AHB clock) NWRENWRL EXD[15:0] EXA[20:1] T EXWDS T EXWDH T EXWSW T EXWSSCS T EXWSH NCS0, NCS1 NHBNWRH, NLBEXA0 T EXWSSA T EXWSH Table 35. Item Symbol Min Typ Max Unit CPUclock Cycle Time TEXCYC − 1T − ns Read Data Access Time TEXACC1 − − 13 ns TEXACC2 − − Tacs + 13 ns TEXACC3 − − Tacs + Tcos + 12 ns Read Data Setup Time TEXRDS 20 − − ns Read Data Hold Time TEXRDH 0 − − ns Read Strobe Pulse Width TEXＲSW Tpgwt +1 Tsub −12 − − ns Write Strobe Pulse Width TEXWSW (Note 54) Tpgwt + 1 Tsub−5 − − ns Write Address Setup Time TEXWSSA Tacs+Tcos + 0.5 Tsub−10 − − ns Write Strobe Setup Time TEXWSSCS Tcos +0.5 Tsub −5 − − ns Write Strobe Hold Time TEXWSH Tcoh + 0.5 Tsub−5 − − ns Write Data Setup Time TEXWDS (Note 54) Tcos+ Tpgwt +1 Tsub −10 − − ns Write Data Hold Time TEXWDH Tcoh + 0.5 Tsub−10 − Tcoh + 0.5 Tsub ns 54. T: BASIC clock rate (frequency = Farm) Regarding Tacs, Tcos, Tpgwt, Tcoh, refer to the external memory controller (XMC) specification Programmers Model_XMC. Even when Tpgwt (programmable wait register) = 1, equivalent to Tpgwt = 0. |
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