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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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W97AH6KB Folha de dados(PDF) 39 Page - Winbond |
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W97AH6KB Folha de dados(HTML) 39 Page - Winbond |
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39 / 127 page  W97AH6KB / W97AH2KB Publication Release Date: May 15, 2014 Revision: A01-001 - 39 - 7.4.8 Write Data Mask One write data mask (DM) pin for each data byte (DQ) will be supported on LPDDR2 devices, consistent with the implementation on LPDDR SDRAMs. Each data mask (DM) may mask its respective data byte (DQ) for any given cycle of the burst. Data mask has identical timings on write operations as the data bits, though used as input only, is internally loaded identically to data bits to insure matched system timing. See 7.4.14.2 “Precharge & Auto Precharge Clarification” table for Write to Precharge timings. 7.4.8.1 Write Data Mask Timing Data Mask Timing tDH tDS tDS tDH VIH(ac) VIL(ac) VIH(dc) VIL(dc) VIH(ac) VIL(ac) VIH(dc) VIL(dc) [Cmd] DQ DM WL = 2 Wirte tDQSSmin tDQSSmax tWR tWTR 0 1 2 3 0 1 2 3 Case 2: max tDQSS Case 1: min tDQSS Data Mask Function,WL= 2, BL=4 shown,second DQ masked DM DQ DQ DM DQS_c DQS_t CK_c CK_t DQS_c DQS_t DQS_c DQS_t |
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