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NT5DS4M32EG Datasheet(PDF) 11 Page - NanoAmp Solutions, Inc. |
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NT5DS4M32EG Datasheet(HTML) 11 Page - NanoAmp Solutions, Inc. |
11 / 46 page Doc # 14-02-045 Rev A ECN 01-1118 11 The specifications of this device are subject to change without notice. For latest documentation see http://www.nanoamp.com. NanoAmp Solutions, Inc. NT5DS4M32EG Advance Information Burst Interruption Read Interrupted by Read Burst Read can be interrupted before completion of the burst by new Read command of any bank. When the previous burst is interrupted, the remaining address are overridden by the new address with the full burst length. The data from the previous Read command continues to appear on the outputs until the /CAS latency from the interrupting Read command is satisfied. Read to Read interval is minimum 1 tCK. Figure 10: Burst Interrupted by Read (Burst length = 4, /CAS Latency = 3) Read Interrupted by Burst stop & Write To interrupt Burst Read with a write command, Burst stop command must be asserted to avoid data contention on the I/O bus by placing the DQ’s(Output drivers) in a high impedance state at least one clock cycle before the Write Command is initiated. Once the burst stop command has been issued, the minimum delay to a write command is CL(RU). [CL is /CAS Latency and RU means round up to the nearest integer.] Figure 11: Burst Interrupted by Burst Stop & Write (Burst Length = 4, /CAS Latency = 3) 012 READ B /CK CK Command 345 6 7 8 NOP NOP NOP NOP NOP NOP NOP READ A DQS Douta0 Douta1 Doutb0 Doutb1 DQ’s Doutb2 Doutb3 /CAS Latency = 3 012 READ B /CK CK Command 345 6 7 8 NOP NOP NOP NOP NOP NOP NOP READ A DQS Douta0 Douta1 Doutb0 Doutb1 DQ’s Doutb2 Doutb3 /CAS Latency = 3 012 Burst stop /CK CK Command 345 6 7 8 NOP NOP NOP WRITE NOP NOP READ DQS Dout0 Dout1 Din 0 Din 1 DQ’s Din 2 Din 3 /CAS Latency = 3 tRPRE Preamble tWPREH tDQSS tWPRES 012 Burst stop /CK CK Command 345 6 7 8 NOP NOP NOP WRITE NOP NOP READ DQS Dout0 Dout1 Din 0 Din 1 DQ’s Din 2 Din 3 /CAS Latency = 3 tRPRE Preamble tWPREH tDQSS tWPRES |
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