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S75WS256NDFBAWMB Datasheet(PDF) 29 Page - SPANSION |
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S75WS256NDFBAWMB Datasheet(HTML) 29 Page - SPANSION |
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29 / 216 page  February 17, 2005 S75WS-N-00_A0 S75WS256Nxx Based MCPs 27 Advance Information Figure 8.2 Synchronous Read 8.3.1 Continuous Burst Read Mode In the continuous burst read mode, the device outputs sequential burst data from the starting address given and then wrap around to address 000000h when it reaches the highest addressable memory location. The burst read mode continues until the system drives CE# high, or RESET= VIL. Continuous burst mode can also be aborted by asserting AVD# low and providing a new ad- dress to the device. If the address being read crosses a 128-word line boundary (as mentioned above) and the sub- sequent word line is not being programmed or erased, additional latency cycles are required as reflected by the configuration register table (Table 8.8). If the address crosses a bank boundary while the subsequent bank is programming or erasing, the device provides read status information and the clock is ignored. Upon completion of status read or program or erase operation, the host can restart a burst read operation using a new ad- dress and AVD# pulse. Write Unlock Cycles: Address 555h, Data AAh Address 2AAh, Data 55h Write Set Configuration Register Command and Settings: Address 555h, Data D0h Address X00h, Data CR Load Initial Address Address = RA Read Initial Data RD = DQ[15:0] Read Next Data RD = DQ[15:0] Wait tIACC + Programmable Wait State Setting Wait X Clocks: Additional Latency Due to Starting Address, Clock Frequency, and Boundary Crossing End of Data? Yes Crossing Boundary? No Yes Completed Delay X Clocks Unlock Cycle 1 Unlock Cycle 2 RA = Read Address RD = Read Data Command Cycle CR = Configuration Register Bits CR15-CR0 CR13-CR11 sets initial access time (from address latched to valid data) from 2 to 7 clock cycles Note: Setup Configuration Register parameters |
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