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 SAMSUNG
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9 page 
512Kx36 & 256Kx72 DLW(Double Late Write) RAM - 9 - Rev 0.1 Mar. 2003 K7Z167288B Preliminary K7Z163688B TRUTH TABLES WRITE TRUTH TABLE(x36) Notes : 1. X means "Don ′t Care". 2. All inputs in this table must meet setup and hold time around the rising edge of CLK( ↑). WE BW a BW b BWc BWd OPERATION H X X X X READ L L H H H WRITE BYTE a L H L H H WRITE BYTE b L H H L H WRITE BYTE c L H H H L WRITE BYTE d L L L L L WRITE ALL BYTEs L H H H H WRITE ABORT/NOP Note: 1. X=Don’t Care, H=High, L=Low. 2. E=T(True) if E2= active and E3=active; E=F(False) if E2=inactive or E3=inactive . 3. " * " indicates that the DQ input requirement / output state and CQ output state are determined by the previous operation. 4. BWx= F(False) if all Byte Write Enable pins are high. B Wx=T(True) if any one Byte Write Enable pin is low. 5. DQs are tri-state in response to Bank Deselect, Deselect, and Write commands . 6. Deassertion of E1 does not deactive the echo clock outputs( CQ1, CQ1 , CQ2, CQ2 ). Echo clock outputs are tri-stated in response to Bank Deselect Commands only. Previous Cycle Input Type E1 (tn) E (tn) ADV (tn) WE (tn) BW x (tn) Current Operation Address DQ/CQ (tn) DQ/CQ (tn+1) Notes N/A D H T L X X Deselect Cycle None * Hi-Z/CQ 4 Deselect C X X H X X Deselect Cycle, Continue Next Hi-Z/CQ Hi-Z/CQ 4 N/A D X F L X X Bank Deselect Cycle None * Hi-Z 4, 5 Bank Deselect C X X H X X Bank Deselect Cycle, Continue Next Hi-Z Hi-Z 4 , 5 N/A R L T L H X Read Cycle, Begin Burst External * Q/CQ 2 Read C X X H X X Read Cycle, Continue Burst Next Q /CQ Q/CQ N/A W L T L L X Write Cycle, Begin Burst External * D/CQ 2, 3 N/A W L T L L F Non-Write Cycle, Begin Burst External * * 2, 3 Write C X X H X T Write Cycle, Continue Burst Next D/CQ D/CQ 3 Write C X X H X F Non-Write Cycle, Continue Burst Next * D/CQ 3, 4, 5 WRITE TRUTH TABLE(x72) Notes : 1. X means "Don ′t Care". 2. All inputs in this table must meet setup and hold time around the rising edge of CLK( ↑). WE BW a BW b BWc BWd BWe BW f BW g BWh OPERATION H X X X X X X X X READ L L H H H H H H H WRITE BYTE a L H L H H H H H H WRITE BYTE b L H H L H H H H H WRITE BYTE c L H H H L H H H H WRITE BYTE d L H H H H L H H H WRITE BYTE e L H H H H H L H H WRITE BYTE f L H H H H H H L H WRITE BYTE g L H H H H H H H L WRITE BYTE h L L L L L L L L L WRITE ALL BYTEs L H H H H H H H H WRITE ABORT/NOP |
