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29 / 65 page October 1, 2003 25903C1 Am29BDS640G 27 Prelimin ary Figure 1. Synchronous/Asynchronous State Diagram Read Mode Setting On power-up or hardware reset, the device is set to be in asynchronous read mode. This setting allows the system to enable or disable burst mode during sys- tem operations. Address A19 determines this setting: “1’ for asynchronous mode, “0” for synchronous mode. Programmable Wait State Configuration The programmable wait state feature informs the device of the number of clock cycles that must elapse after AVD# is driven active before data will be available. This value is determined by the input frequency of the device. Address bits A14– A12 determine the setting (see Table 8). The wait state command sequence instructs the device to set a particular number of clock cycles for the initial access in burst mode. The number of wait states that should be programmed into the device is directly related to the clock frequency. Power-up/ Hardware Reset Asynchronous Read Mode Only Synchronous Read Mode Only Set Burst Mode Configuration Register Command for Synchronous Mode (A19 = 0) Set Burst Mode Configuration Register Command for Asynchronous Mode (A19 = 1) |
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