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M32000D4BFP-80 Fiches technique(PDF) 41 Page - Mitsubishi Electric Semiconductor |
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M32000D4BFP-80 Fiches technique(HTML) 41 Page - Mitsubishi Electric Semiconductor |
41 / 44 page SINGLE-CHIP 32-BIT CMOS MICROCOMPUTER MITSUBISHI MICROCOMPUTERS M32000D4BFP-80 41 Fig. 41 Bus arbitration timing CLKIN HREQ HACK A8 to A30, SID, ST, BS, BCH, BCL, R/W, BURST (output) (input) (input) (output) *1 The HREQ signal can be input asynchronously. *2 All switching characteristics and timing requirements based on the falling edge of CLKIN are calculated according to the internal CLKIN (duty ratio is 50%) . When designing external peripheral circuits, the correction for the duty cycle of the actual CLKIN is necessary. • minimum value of td(CLKIN-HACKHX) = (value in table) – (correction value) = 0 – (50 x 5/100) = –2.5 [ns] • maximum value of td(CLKIN-HACKL) = (value in table) + (correction value) = 8 + (50 x 5/100) = 10.5 [ns] [example] HACK signal transition ("H" –> "L") when inputting 20 MHz clock whose duty ratio is 45 - 55% (± 5%) to CLKIN: 0.5VCC 0.5VCC td(CLKIN-HACKL) td(CLKIN-HACKHX) td(CLKIN-HACKH) td(CLKIN-HACKLX) td(CLKIN-AZX) td(CLKIN-AZ) tsu(HREQ-CLKIN) 41 42 43 44 45 46 47 *1 *1 th(CLKIN-HREQ) 40 *2 *2 *2 *2 |
Numéro de pièce similaire - M32000D4BFP-80 |
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Description similaire - M32000D4BFP-80 |
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