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MBM30LV0064-PFTR Datasheet(PDF) 9 Page - Fujitsu Component Limited. |
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MBM30LV0064-PFTR Datasheet(HTML) 9 Page - Fujitsu Component Limited. |
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9 / 43 page  MBM30LV0064 9 s s s s FUNCTIONAL DESCRIPTION READ MODE There are three distinct commands used for the read operation: 00h, 01h, and 50h. After the command cycle, three address cycles are used to input the starting address. Upon the rising edge of the final WE pulse, there is a 7 µs latency in which the 528 byte page is transferred to the data register. The R/B signal may be used to monitor the completion of the data transfer. In the read operation, the CE signal must stay “Low” after the third address input and during Busy state. If the CE signal goes High during this period, the read operation will be terminated and then the standby mode will be entered. Once the page of data has been loaded into the data register, it may be clocked out with consecutive 50 ns RE pulses. Each RE pulse will automatically advance the column address by one. Once the last column has been read, the page address will automatically increment by one and the data register will be updated with the new page after 7 µs. The 00h Read command will set the pointer to the first half page of the array while the 01h Read command will set it in the second half. It may be logical to think of 00h as a command which sets A8 = 0 while 01h sets A8 = 1. The 50h command set the pointer to the spare area, consisting of columns 512 to 527. During this read mode, A3 to A0 is used to set the starting address of the spare area. As with the 00h and 01h operations, once the spare area page is loaded into the data register, it may be read out by RE pulses. Each RE pulse will increment the column address until the final column (527) is reached. At this time, the pointer will be reset to column 512 while the page address is incriminated and the data register is updated. The 00h or 01h command is required to move the pointer back into the main array area. Read (1), (2): 00h/01h The Read (1), (2) mode is invoked by latching the 00h or 01h command into the command register. This mode (00h) will be automatically selected when the device powers up. CLE CE WE ALE RE I/O0 to I/O7 Y X X R/B 00h Data Output Starting Address Command 01h 0 255 511 527 (Column Address) Page (Row) Address X YY Figure 2 Read Mode (1), (2) Operation |
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