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ACT-F1288N-090P7M Datasheet(PDF) 8 Page - Aeroflex Circuit Technology |
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ACT-F1288N-090P7M Datasheet(HTML) 8 Page - Aeroflex Circuit Technology |
8 / 21 page Aeroflex Circuit Technology SCD1676 REV A 5/6/98 Plainview NY (516) 694-6700 8 D5 EXCEEDED TIMING LIMITS D5 will indicate if the program or erase time has exceeded the specified limits. Under these conditions D5 will produce a "1". The Program or erase cycle was not successfully completed. Data Polling is the only operation function of the device under this condition. The CE circuit will partially power down the device under these conditions by approximately 8 mA per chip. The OE and WE pins will control the output disable functions as shown in Table 1. To reset the device, write the reset command sequence to the device. This allows the system to continue to use the other active sectors in the device. D4 - HARDWARE SEQUENCE FLAG If the device has exceeded the specified erase or program time and D5 is "1", then D4 Will indicate which step in the algorithm the device exceeded the limits. A "0" in D4 indicates in programming, a "1" indicates an erase. (See Table 4) D3 SECTOR ERASE TIMER After the completion of the initial sector erase command sequence the sector erase time-out will begin. D3 will remain low until the time-out is complete. Data Polling and Toggle Bit are valid after the initial sector erase command sequence. If Data Polling or the Toggle Bit indicates the device has been written with a valid erase command, D3 may be used to determine if the sector erase timer window is still open. If D3 is high ("1") the internally controlled erase cycle has begun; attempts to write subsequent commands to the device will be ignored until the erase operation is completed as indicated by Data Polling or Toggle Bit. If D3 is low ("0"), the device will accept additional sector erase commands. To ensure the command has been accepted, the software should check the status of D3 prior to and following each subsequent sector erase command. If D3 were high on the second status check, the command may not have been accepted. Sector Protection Algorithims SECTOR PROTECTION The ACT-F128K8 features hardware sector protection which will disable both program and erase operations to an individual sector or any group of sectors. To activate this mode, the programming equipment must force VID on control pin OE and address pin A9. The sector addresses should be set using higher address lines A16, A15, and A14. The protection mechanism begins on the falling edge of the WE pulse and is terminated with the rising edge of the same. It is also possible to verify if a sector is protected during the sector protection operation. This is done by setting CE = OE = VIL and WE = VIH (A9 remains high at VID). Reading the device at address location XXX2H, where the higher order addresses (A16, A15 and A14) define a particular sector, will produce 01H at data outputs D0 - D7, for a protected sector. SECTOR UNPROTECT The ACT-F128K8 also features a sector unprotect mode, so that a protected sector may be unprotected to incorporate any changes in the code. All sectors should be protected prior to unprotecting any sector. To activate this mode, the programming equipment must force VID on control pins OE, CE, and address pin A9. The address pins A6, A7, and A12 should be set to VIH, and A6 = VIL. The unprotection mechanism begins on the falling edge of the WE pulse and is terminated with the rising edge of the same. It is also possible to determine if a sector is unprotected in the system by writing the autoselect command. Performing a read operation at address location XXX2H, where the higher order addresses (A16, A15, and A14) define a particular sector address, will produce 00H at data outputs (D0-D7) for an unprotected sector. Table 4 — Hardware Sequence Flags In Progress Status D7 D6 D5 D4 D3 D2 – D0 Auto-Programming D7 Toggle 0 0 0 Reserved for future use Programming in Auto Erase 0 Toggle 0 0 1 Erase in Auto Erase 0 Toggle 0 1 1 Exceeding Time Limits Auto-Programming D7 Toggle 1 0 0 Reserved for future use Programming in Auto Erase T0 Toggle 1 0 1 Erase in Auto Erase 0 Toggle 1 1 1 |
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