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EDS1232AATA-75L-E Datasheet(PDF) 29 Page - Elpida Memory |
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EDS1232AATA-75L-E Datasheet(HTML) 29 Page - Elpida Memory |
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29 / 53 page  EDS1232AATA Data Sheet E0386E40 (Ver. 4.0) 29 Auto Precharge Read with auto-precharge In this operation, since precharge is automatically performed after completing a read operation, a precharge command need not be executed after each read operation. The command executed for the same bank after the execution of this command must be the bank active (ACT) command. In addition, an interval defined by lAPR is required before execution of the next command. [Clock cycle time] /CAS latency Precharge start cycle 3 2 cycle before the final data is output 2 1 cycle before the final data is output CLK lAPR lRAS lAPR CL=2 Command CL=3 Command DQ DQ Note: Internal auto-precharge starts at the timing indicated by " ". And an interval of tRAS (lRAS) is required between previous active (ACT) command and internal precharge " ". ACT READA ACT out3 out2 out1 out0 lRAS ACT READA ACT out3 out2 out1 out0 Burst Read (BL = 4) Write with auto-precharge In this operation, since precharge is automatically performed after completing a burst write or single write operation, a precharge command need not be executed after each write operation. The command executed for the same bank after the execution of this command must be the bank active (ACT) command. In addition, an interval of lDAL is required between the final valid data input and input of next command. CLK Command DQ lDAL lRAS ACT WRITA in0 in1 in2 in3 ACT Note: Internal auto-precharge starts at the timing indicated by " ". and an interval of tRAS (lRAS) is required between previous active (ACT) command and internal precharge " ". Burst Write (BL = 4) |
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