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GS8342D20BGD-450 데이터시트(PDF) 9 Page - GSI Technology |
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GS8342D20BGD-450 데이터시트(HTML) 9 Page - GSI Technology |
9 / 30 page Separate I/O SigmaQuad II+ B4 SRAM Truth Table Previous Operation A R W Current Operation D D D D Q Q Q Q K (tn-1) K (tn) K (tn) K (tn) K (tn) K (tn+1) K (tn+1½) K (tn+2) K (tn+2½) K (tn+2½) K (tn+3) K (tn+3½) K (tn+4) Deselect X 1 1 Deselect X X — — Hi-Z Hi-Z — — Write X 1 X Deselect D2 D3 — — Hi-Z Hi-Z — — Read X X 1 Deselect X X — — Q2 Q3 — — Deselect V 1 0 Write D0 D1 D2 D3 Hi-Z Hi-Z — — Deselect V 0 X Read X X — — Q0 Q1 Q2 Q3 Read V X 0 Write D0 D1 D2 D3 Q2 Q3 — — Write V 0 X Read D2 D3 — — Q0 Q1 Q2 Q3 Notes: 1. “1” = input “high”; “0” = input “low”; “V” = input “valid”; “X” = input “don’t care” 2. “—” indicates that the input requirement or output state is determined by the next operation. 3. Q0, Q1, Q2, and Q3 indicate the first, second, third, and fourth pieces of output data transferred during Read operations. 4. D0, D1, D2, and D3 indicate the first, second, third, and fourth pieces of input data transferred during Write operations. 5. Users should not clock in metastable addresses. Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. Rev: 1.02c 8/2017 9/30 © 2011, GSI Technology GS8342D06/11/20/38BD-550/500/450/400/350 Byte Write Clock Truth Table BW BW BW BW Current Operation D D D D K (tn+1) K (tn+1½) K (tn+2) K (tn+2½) K (tn) K (tn+1) K (tn+1½) K (tn+2) K (tn+2½) T T T T Write Dx stored if BWn = 0 in all four data transfers D0 D2 D3 D4 T F F F Write Dx stored if BWn = 0 in 1st data transfer only D0 X X X F T F F Write Dx stored if BWn = 0 in 2nd data transfer only X D1 X X F F T F Write Dx stored if BWn = 0 in 3rd data transfer only X X D2 X F F F T Write Dx stored if BWn = 0 in 4th data transfer only X X X D3 F F F F Write Abort No Dx stored in any of the four data transfers X X X X Notes: 1. “1” = input “high”; “0” = input “low”; “X” = input “don’t care”; “T” = input “true”; “F” = input “false”. 2. If one or more BWn = 0, then BW = “T”, else BW = “F”. |
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