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AM49DL640BG 데이터시트(PDF) 23 Page - SPANSION |
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AM49DL640BG 데이터시트(HTML) 23 Page - SPANSION |
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23 / 62 page  22 Am49DL640BG March 8, 2002 PR E L I M I N A R Y power-up and power-down. The command register and all internal program/erase circuits are disabled, and the device resets to the read mode. Subsequent writes are ignored until V CC is greater than VLKO. The system must provide the proper signals to the control pins to prevent unintentional writes when V CC is greater than V LKO. Write Pulse “Glitch” Protection Noise pulses of less than 5 ns (typical) on OE#, CE#f or WE# do not initiate a write cycle. Logical Inhibit Write cycles are inhibited by holding any one of OE# = V IL, CE#f = VIH or WE# = VIH. To initiate a write cycle, CE#f and WE# must be a logical zero while OE# is a logical one. Power-Up Write Inhibit If WE# = CE#f = V IL and OE# = VIH during power up, the device does not accept commands on the rising edge of WE#. The internal state machine is automati- cally reset to the read mode on power-up. COMMON FLASH MEMORY INTERFACE (CFI) The Common Flash Interface (CFI) specification out- lines device and host system software interrogation handshake, which allows specific vendor-specified software algorithms to be used for entire families of devices. Software support can then be device-inde- pendent, JEDEC ID-independent, and forward- and backward-compatible for the specified flash device families. Flash vendors can standardize their existing interfaces for long-term compatibility. This device enters the CFI Query mode when the sys- tem writes the CFI Query command, 98h, to address 55h in word mode (or address AAh in byte mode), any time the device is ready to read array data. The system can read CFI information at the addresses given in Tables 8–11. To terminate reading CFI data, the system must write the reset command.The CFI Query mode is not accessible when the device is exe- cuting an Embedded Program or embedded Erase al- gorithm. The system can also write the CFI query command when the device is in the autoselect mode. The device enters the CFI query mode, and the system can read CFI data at the addresses given in Tables 8–11. The system must write the reset command to return the de- vice to the autoselect mode. For further information, please refer to the CFI Specifi- cation and CFI Publication 100, available via the Wor ld Wide We b at ht t p:/ /w ww. amd. co m/ prod- ucts/nvd/overview/cfi.html. Alternatively, contact an AMD representative for copies of these documents. Table 8. CFI Query Identification String Addresses (Word Mode) Addresses (Byte Mode) Data Description 10h 11h 12h 20h 22h 24h 0051h 0052h 0059h Query Unique ASCII string “QRY” 13h 14h 26h 28h 0002h 0000h Primary OEM Command Set 15h 16h 2Ah 2Ch 0040h 0000h Address for Primary Extended Table 17h 18h 2Eh 30h 0000h 0000h Alternate OEM Command Set (00h = none exists) 19h 1Ah 32h 34h 0000h 0000h Address for Alternate OEM Extended Table (00h = none exists) |
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