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AS29F200B-55SC Datasheet(PDF) 5 Page - Alliance Semiconductor Corporation |
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AS29F200B-55SC Datasheet(HTML) 5 Page - Alliance Semiconductor Corporation |
5 / 20 page ® $65<)533 $65<)533 $65<)533 $65<)533 3UHOLPLQDU\#LQIRUPDWLRQ 3UHOLPLQDU\#LQIRUPDWLRQ 3UHOLPLQDU\#LQIRUPDWLRQ 3UHOLPLQDU\#LQIRUPDWLRQ ','#4407333<0$1#72:233 ','#4407333<0$1#72:233 ','#4407333<0$1#72:233 ','#4407333<0$1#72:233 $//,$1&(#6(0,&21'8&725 $//,$1&(#6(0,&21'8&725 $//,$1&(#6(0,&21'8&725 $//,$1&(#6(0,&21'8&725 8888 :ULWH#RSHUDWLRQ#VWDWXV † Toggles with OE or CE only for erasing or erase suspended sector addresses. ‡ Toggles only if DQ5 = 1 and address applied is within sector that exceeded timing limits. DQ8–DQ15 = Don’t care in ×16 mode. &RPPDQG#GHILQLWLRQV Status DQ7 DQ6 DQ5 DQ3 DQ2 RY/BY In progress Auto programming (byte/word) DQ7 Toggle 0 0 No toggle 0 Program/erase in auto erase 0 Toggle 0 1 Toggle† 0 Erase suspend mode Read erasing sector 1 No toggle 0 0 Toggle 1 Read non-erasing sector Data Data Data Data Data 1 Program in erase suspend DQ7 Toggle 0 0 Toggle † 0 Exceeded time limits Auto programming (byte/word) DQ7 Toggle 1 NA No toggle 1 Program/erase in auto erase 0 Toggle 1 1 Toggle ‡ 1 Program in erase suspend DQ7 Toggle 1 NA No toggle‡ 1 Item Description Reset/Read Initiate read or reset operations by writing the Read/Reset command sequence into the command register. This allows the microprocessor to retrieve data from the memory. Device remains in read mode until command register contents are altered. Device automatically powers up in read/reset state. This feature allows only reads, therefore ensuring no spurious memory content alterations during power up. ID Read AS29F200 provides manufacturer and device codes in two ways. External PROM programmers typically access the device codes by driving +12V on A9. AS29F200 also contains an ID read command to read the device code with only +5V, since multiplexing +12V on address lines is generally undesirable. Initiate device ID read by writing the ID Read command sequence into the command register. Follow with a read sequence from address XX00h to return MFG code. Follow ID read command sequence with a read sequence from address XX01h to return device code. To verify write protect status on sectors, read address XX02h. Sector addresses A16–A12 produce a 1 on DQ0 for protected sector and a 0 for unprotected sector. Exit from ID read mode with Read/Reset command sequence. Hardware Reset Holding RESET low for 500 ns resets the device, terminating any operation in progress; data handled in the operation is corrupted. The internal state machine resets 20 µs after RESET is driven low. RY/BY remains low until the RESET operation is completed. After RESET is set high, there is a delay of 1.5 µs for the device to permit read operations. |
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