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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS4C64M8D2 датащи(PDF) 42 Page - Alliance Semiconductor Corporation |
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AS4C64M8D2 датащи(HTML) 42 Page - Alliance Semiconductor Corporation |
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42 / 59 page  AS4C64M8D2 Confidential 42 Rev. 1.0 Feb. /2014 Figure 26. Burst write followed by burst read: RL=5 (AL=2, CL=3, WL=4, tWTR=2, BL=4) CK# CK CKE T0 T1 T4 T5 T6 T7 T8 T9 T2 T3 NOP NOP NOP NOP Post CAS# READ A NOP NOP NOP NOP DQS AL=2 DQS# WL = RL-1 = 4 DQS# DQS CL=3 RL=5 >=tWTR DNA0 DNA1 DNA2 DNA3 DOUT A0 DQ NOTE : The minimum number of clock from the burst write command to the burst read command is [CL-1 + BL/2 + tWTR]. This tWTR is not a write recovery time (tWR) but the time required to transfer the 4 bit write data from the input buffer into sense amplifiers in the array. tWTR is defined in the timing parameter table of this standard. Write to Read = CL-1+BL/2+tWTR Figure 27. Seamless burst write operation RL=5, WL=4, BL=4 CK# CK CMD T0 T1 T4 T5 T6 T7 T8 T2 T3 Post CAS# Write A NOP Post CAS# Write B NOP NOP NOP NOP NOP NOP DQS DQS# WL = RL-1 = 4 DQS# DQS DNA0 DNA1 DNA2 DNA3 DQ DNB0 DNB1 DNB2 DNB3 NOTE : The seamless burst write operation is supported by enabling a write command every other clock for BL= 4 operation, every four clocks for BL = 8 operation. This operation is allowed regardless of same or different banks as long as the banks are activated. |
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