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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LPC2292 датащи(PDF) 33 Page - NXP Semiconductors |
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LPC2292 датащи(HTML) 33 Page - NXP Semiconductors |
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33 / 40 page  Philips Semiconductors LPC2292/LPC2294 16/32-bit ARM microcontrollers with external memory interface Preliminary data Rev. 01 — 05 February 2004 33 of 40 9397 750 12748 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. [1] Except on initial access, in which case the address is set up tCYC earlier. tAVDV Burst-ROM Initial Memory Access Time (latest of Address Valid, CS LOW, OE LOW to Data Valid) (tCYC*(2 + WST1)) + (−20) - ns tAVDV Burst-ROM Subsequent Memory Access Time (Address Valid to Data Valid) tCYC +(−20) - ns tSTHDNV Data Hold Time (earliest of CS HIGH, OE HIGH, Address Change to Data Invalid) 0- ns tCSHOEH CS HIGH to OE HIGH −55 ns tOEHANV OE HIGH to Address Invalid −55 ns tCHOEL XCLK HIGH to OE LOW −55 ns tCHOEH XCLK HIGH to OE HIGH −55 ns Write Cycle Parameters tAVCSLW Address Valid to CS LOW tCYC − 10 [1] -ns tCSLDVW CS LOW to Data Valid −55 ns tCSLWEL CS LOW to WE LOW −55 ns tCSLBLSL CS LOW to BLS LOW −55 ns tWELDV WE LOW to Data Valid −55 ns tCSLDV CS LOW to Data Valid −55 ns tWELWEH WE LOW to WE HIGH tCYC × (1 + WST2) − 5tCYC*(1 + WST2) + 5 ns tWELWEH BLS LOW to BLS HIGH tCYC × (1 + WST2) − 5tCYC*(1 + WST2) + 5 ns tWEHANV WE HIGH to Address Invalid tCYC−5tCYC +5 ns tWEHDNV WE HIGH to Data Invalid (2 × tCYC)−5(2 × tCYC)+5 ns tBLSHANV BLS HIGH to Address Invalid tCYC−5tCYC +5 ns tBLSHDNV BLS HIGH to Data Invalid (2 × tCYC)−5(2 × tCYC)+5 ns tCHDV XCLK HIGH to Data Valid - 10 ns tCHWEL XCLK HIGH to WE LOW - 10 ns tCHHBLSL XCLK HIGH to BLS LOW - 10 ns tAVCSL XCLK HIGH to WE HIGH - 10 ns tAVCSL XCLK HIGH to BLS HIGH - 10 ns tAVCSL XCLK HIGH to Data Invalid - 10 ns Table 13: External memory interface AC characteristics. CL =25pF. Tamb =40 °C…continued Symbol Description Min Max Unit |
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