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X28C513EMB-20 Datasheet(PDF) 5 Page - Intersil Corporation |
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X28C513EMB-20 Datasheet(HTML) 5 Page - Intersil Corporation |
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5 / 21 page  5 FN8106.2 June 7, 2006 Device Operation Read Read operations are initiated by both OE and CE LOW. The read operation is terminated by either CE or OE returning HIGH. This two line control architecture eliminates bus contention in a system environment. The data bus will be in a high impedance state when either OE or CE is HIGH. Write Write operations are initiated when both CE and WE are LOW and OE is HIGH. The X28C512, X28C513 support both a CE and WE controlled write cycle. That is, the address is latched by the falling edge of either CE or WE, whichever occurs last. Similarly, the data is latched internally by the rising edge of either CE or WE, whichever occurs first. A byte write operation, once initiated, will automatically continue to completion, typically within 5ms. Page Write Operation The page write feature of the X28C512, X28C513 allows the entire memory to be written in 2.5 seconds. Page write allows two to one hundred twenty-eight bytes of data to be consecutively written to the X28C512, X28C513, prior to the commencement of the internal programming cycle. The host can fetch data from another device within the system during a page write operation (change the source address), but the page address (A7 through A15) for each subsequent valid write cycle to the part during this operation must be the same as the initial page address. The page write mode can be initiated during any write operation. Following the initial byte write cycle, the host can write an additional one to one hundred twenty-seven bytes in the same manner as the first byte was written. Each successive byte load cycle, started by the WE HIGH to LOW transition, must begin within 100µs of the falling edge of the preceding WE. If a subsequent WE HIGH to LOW transition is not detected within 100µs, the internal automatic programming cycle will commence. There is no page write window limitation. Effectively, the page write window is infinitely wide, so long as the host continues to access the device within the byte load cycle time of 100µs. Write Operation Status Bits The X28C512, X28C513 provide the user two write operation status bits. These can be used to optimize a system write cycle time. The status bits are mapped onto the I/O bus as shown in Figure 1. DATA Polling (I/O7) The X28C512, X28C513 feature DATA polling as a method to indicate to the host system that the byte write or page write cycle has completed. DATA Polling allows a simple bit test operation to determine the status of the X28C512, X28C513, eliminating additional interrupt inputs or external hardware. During the internal programming cycle, any attempt to read the last byte written will produce the complement of that data on I/O7 (i.e. write data = 0xxx xxxx, read data = 1xxx xxxx). Once the programming cycle is complete, I/O7 will reflect true data. Toggle Bit (I/O6) The X28C512, X28C513 also provide another method for determining when the internal write cycle is complete. During the internal programming cycle, I/O6 will toggle from HIGH to LOW and LOW to HIGH on subsequent attempts to read the device. When the internal cycle is complete, the toggling will cease, and the device will be accessible for additional read or write operations. 5 TB DP 43 21 0 I/O Reserved Toggle Bit DATA Polling FIGURE 1. STATUS BIT ASSIGNMENT X28C512, X28C513 |
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