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UPD4481361GF-A85 Datasheet(PDF) 11 Page - NEC |
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UPD4481361GF-A85 Datasheet(HTML) 11 Page - NEC |
11 / 28 page 11 Data Sheet M15561EJ3V0DS µPD4481161, 4481181, 4481321, 4481361 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 ADV /WE /BWs /CKE CLK I/O Address Note Deselected H ×× L ×× LL → H High-Z None 1 Deselected × L × L ×× LL → H High-Z None 1 Deselected ×× HL ×× LL → H High-Z None 1 Continue Deselected ×× × H ×× LL → H High-Z None 1 Read Cycle / Begin Burst L H L L H × LL → H Dout External Read Cycle / Continue Burst ×× × H ×× LL → H Dout Next Write Cycle / Begin Burst L H LLLL L L → H Din External Write Cycle / Continue Burst ×× × H × LL L → HDin Next Write Cycle / Write Abort L H L L L H L L → H High-Z External Write Cycle / Write Abort ×× × H × HL L → H High-Z Next Stall / Ignore Clock Edge ×× ×××× HL → H − Current 2 Notes 1. Deselect status is held until new “Begin Burst” entry. 2. If an Ignore Clock Edge command occurs during a read operation, the I/O bus will remain active (low impedance). If it occurs during a write cycle, the bus will remain high impedance. No write operation will be performed during the Ignore Clock Edge cycle. Remarks 1. × : don’t care 2. /BWs = L means any one or more byte write enables (/BW1, /BW2, /BW3 or /BW4) are LOW. /BWs = H means all byte write enables (/BW1, /BW2, /BW3 or /BW4) are HIGH. |
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