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AM29F400AT-70EC Scheda tecnica(PDF) 8 Page - Advanced Micro Devices |
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AM29F400AT-70EC Scheda tecnica(HTML) 8 Page - Advanced Micro Devices |
8 / 35 page 8 Am29F400AT/Am29F400AB PRELIMINARY Table 1. Am29F400A User Bus Operations (BYTE = VIH) Table 2. Am29F400A User Bus Operations (BYTE = VIL) Legend: L = logic 0, H = logic 1, X = Don’t Care. See Characteristics for voltage levels. Notes: 1. Manufacturer and device codes may also be accessed via a command register write sequence. Refer to Table 4. 2. Refer to the section on Sector Protection. Read Mode The Am29F400A has two control functions which must be satisfied in order to obtain data at the outputs. CE is the power control and should be used for device selec- tion. OE is the output control and should be used to gate data to the output pins if a device is selected. Address access time (tACC) is equal to the delay from stable addresses to valid output data. The chip enable access time (tCE) is the delay from stable addresses and stable CE to valid data at the output pins. The output enable access time is the delay from the falling edge of OE to valid data at the output pins (as- suming the addresses have been stable for at least tACC-tOE time). Standby Mode There are two ways to implement the standby mode on the Am29F400A device, both using the CE pin. A CMOS standby mode is achieved with the CE input held at VCC ± 0.5 V. Under this condition the current is typically reduced to less than 5 µA. A TTL standby mode is achieved with the CE pin held at VIH. Under this condition the current is typically reduced to 1 mA. In the standby mode the outputs are in the high imped- ance state, independent of the OE input. Operation CE OE WE A0 A1 A6 A9 DQ0–DQ15 RESET Autoselect, AMD Manuf. Code (Note 1) L L H L L L VID Code H Autoselect Device Code (Note 1) L L H H L L VID Code H Read L L H A0 A1 A6 A9 DOUT H Standby H XXXXXX HIGH Z H Output Disable L H H XXXX HIGH Z H Write L H L A0 A1 A6 A9 DIN H Verify Sector Protect (Note 2) L LHLHL VID Code H Temporary Sector Unprotect XXXXXXX X VID Hardware Reset XXXXXXX HIGH Z L Operation CE OE WE A0 A1 A6 A9 DQ0–DQ7 DQ8–DQ15 RESET Autoselect, AMD Manuf. Code (Note 1) LL H LLL VID Code HIGH Z H Autoselect Device Code (Note 1) L L H H L L VID Code HIGH Z H Read L L H A0 A1 A6 A9 DOUT HIGH Z H Standby H XXXXXX HIGH Z HIGH Z H Output Disable L H H XXXX HIGH Z HIGH Z H Write L H L A0 A1 A6 A9 DIN HIGH Z H Verify Sector Protect (Note 2) L LHLHL VID Code HIGH Z H Temporary Sector Unprotect XXXXXXX X HIGH Z VID Hardware Reset XXXXXXX HIGH Z HIGH Z L |
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