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AM29F400BT-50 Datasheet(PDF) 19 Page - SPANSION |
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AM29F400BT-50 Datasheet(HTML) 19 Page - SPANSION |
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19 / 43 page  November 11, 2009 21505E8 Am29F400B 17 D A TA SH EE T Table 5. Am29F400B Command Definitions Legend: X = Don’t care RA = Address of the memory location to be read. RD = Data read from location RA during read operation. PA = Address of the memory location to be programmed. Addresses latch on the falling edge of the WE# or CE# pulse, whichever happens later. PD = Data to be programmed at location PA. Data latches on the rising edge of WE# or CE# pulse, whichever happens first. SA = Address of the sector to be verified (in autoselect mode) or erased. Address bits A17–A12 uniquely select any sector. Notes: 1. See Table 1 for description of bus operations. 2. All values are in hexadecimal. 3. Except when reading array or autoselect data, all bus cycles are write operations. 4. Data bits DQ15–DQ8 are don’t cares for unlock and command cycles. 5. Address bits A17–A11 are don’t cares for unlock and command cycles, unless PA or SA required. 6. No unlock or command cycles required when reading array data. 7. The Reset command is required to return to reading array data when device is in the autoselect mode, or if DQ5 goes high (while the device is providing status data). 8. The fourth cycle of the autoselect command sequence is a read cycle. 9. The data is 00h for an unprotected sector and 01h for a protected sector. See“Autoselect Command Sequence” for more information. 10. The system may read and program in non-erasing sectors, or enter the autoselect mode, when in the Erase Suspend mode. The Erase Suspend command is valid only during a sector erase operation. 11. The Erase Resume command is valid only during the Erase Suspend mode. Command Sequence (Note 1) Bus Cycles (Notes 2–5) First Second Third Fourth Fifth Sixth Addr Data Addr Data Addr Data Addr Data Addr Data Addr Data Read (Note 6) 1 RA RD Reset (Note 7) 1 XXX F0 Manufacturer ID Word 4 555 AA 2AA 55 555 90 X00 01 Byte AAA 555 AAA Device ID, Top Boot Block Word 4 555 AA 2AA 55 555 90 X01 2223 Byte AAA 555 AAA X02 23 Device ID, Bottom Boot Block Word 4 555 AA 2AA 55 555 90 X01 22AB Byte AAA 555 AAA X02 AB Sector Protect Verify (Note 9) Word 4 555 AA 2AA 55 555 90 (SA) X02 XX00 XX01 Byte AAA 555 AAA (SA) X04 00 01 Program Word 4 555 AA 2AA 55 555 A0 PA PD Byte AAA 555 AAA Chip Erase Word 6 555 AA 2AA 55 555 80 555 AA 2AA 55 555 10 Byte AAA 555 AAA AAA 555 AAA Sector Erase Word 6 555 AA 2AA 55 555 80 555 AA 2AA 55 SA 30 Byte AAA 555 AAA AAA 555 Erase Suspend (Note 10) 1 XXX B0 Erase Resume (Note 11) 1 XXX 30 |
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