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UPD4482181GF-C75 Datasheet(PDF) 10 Page - NEC |
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UPD4482181GF-C75 Datasheet(HTML) 10 Page - NEC |
10 / 28 page 10 µPD4482161, 4482181, 4482321, 4482361 Data Sheet M14521EJ3V0DS Asynchronous Truth Table Operation /G I/O Read Cycle L Dout Read Cycle H High-Z Write Cycle × High-Z, Din Deselected × High-Z Remark × : don’t care Synchronous Truth Table Operation /CE CE2 /CE2 /AP /AC /ADV /WRITE CLK Address Deselected Note H ××× L ×× L → H None Deselected Note LL × L ×× × L → H None Deselected Note L × HL ×× × L → H None Deselected Note LL × HL ×× L → H None Deselected Note L × HH L ×× L → H None Read Cycle / Begin Burst L H L L ×× × L → H External Read Cycle / Begin Burst L H L H L × HL → H External Read Cycle / Continue Burst ××× HH L H L → HNext Read Cycle / Continue Burst H ××× HL H L → HNext Read Cycle / Suspend Burst ××× HH H H L → H Current Read Cycle / Suspend Burst H ××× HH H L → H Current Write Cycle / Begin Burst L H L H L × LL → H External Write Cycle / Continue Burst ××× HH L L L → HNext Write Cycle / Continue Burst H ××× HL L L → HNext Write Cycle / Suspend Burst ××× HH H L L → H Current Write Cycle / Suspend Burst H ××× HH L L → H Current Note Deselect status is held until new “Begin Burst” entry. Remarks 1. × : don’t care 2. /WRITE = L means any one or more byte write enables (/BW1, /BW2, /BW3 or /BW4) and /BWE are LOW or /GW is LOW. /WRITE = H means the following two cases. (1) /BWE and /GW are HIGH. (2) /BW1 to /BW4 and /GW are HIGH, and /BWE is LOW. |
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