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HY27UF082G2B Datasheet(PDF) 16 Page - Hynix Semiconductor |
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HY27UF082G2B Datasheet(HTML) 16 Page - Hynix Semiconductor |
16 / 54 page Rev 0.2 / Jan. 2008 16 1 HY27UF(08/16)2G2B Series 2Gbit (256Mx8bit) NAND Flash 3.13 Cache Read Cache read operation allows automatic download of consecutive pages. Immediately after 1st latency end, while user can start reading out data, device internally starts reading following page. Start address of 1st page is at page start (A<10:0>=00h), after 1st latency time (tr) , automatic data download will be uninterrupted. In fact latency time is 25us, while download of a page require at least 100us for x8 device. (50us for x16device). The Cache Read function may be issued after the Read function is complete (SR[6] is set to one). The host may enter the address of the next page to be read from the Flash array. Data output always begins at column address 00h. If the host does not enter an address to retrieve, the next sequential page is read. When the Cache Read function is issued, SR[6] is cleared to zero (busy). After the operation is begun SR[6] is set to one (ready) and the host may begin to read the data from the previous Read or Cache Read function. Issuing an additional Cache Read function copies the data most recently read from the array into the page register. When no more pages are to be read, the final page is copied into the page register by issuing the 3Fh command. The host may begin to read data from the page register when SR[6]is set to one (ready). When the 31h and 3Fh commands are issued, SR[6] shall be cleared to zero (busy) until the page has finished being copied from the Flash array. The host shall not issue a sequential Read Cache (31h) command after the last page of the device is read. Refer to Figure 15. Cache Read operation must be done only block by block if system needs to avoid reading also reading from invalid blocks. |
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