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ACT-F512K8N-150F7I Datasheet(PDF) 8 Page - Aeroflex Circuit Technology |
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ACT-F512K8N-150F7I Datasheet(HTML) 8 Page - Aeroflex Circuit Technology |
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8 / 21 page  Aeroflex Circuit Technology SCD1668 REV A 4/28/98 Plainview NY (516) 694-6700 8 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 com- mands to the device will be ignored until the erase oper- ation 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. See Table 4 Sector Protection Algorithims SECTOR PROTECTION The ACT-F512K8 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 A18, A17, and A16. The protection mechanism begins on the falling edge of the WE pulse and is terminated with the rising edge of the same. To verify programming of the protection circuitry, the pro- gramming equipment must force VID on address pin A9 with CE and OE at VIL and WE at VIH. Scanning the sec- tor addresses (A16, A17, and A18) while (A6, A1, A0) = (0, 1, 0,) will produce a logical "1" code at device output D0 for a protected sector. Otherwise the device will read 00H for unprotected sector. In this mode, the lower order addresses, except for 0, A1, and A6 are don't care. It is also possible to verify if a sector is protected during the sector protection operation. This is done by setting A6 = CE = OE = VIL and WE = VIH (A9 remains high at VID). Reading the device at address location XXX2H, where the higher order addresses (A18, A17, and A16) define a particular sector, will produce 01H at data out- puts (D0 - D7) for a protected sector. SECTOR UNPROTECT The ACT-F512K8 also features a sector unprotect mode, so that a protected sector may be unprotected to incor- porate 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, A16, and A12 should be set to VIH. 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 and A6 is set at VIH. Performing a read operation at address location XXX2H, where the higher order addresses (A18, A17, and A16) define a particular sector address, will pro- duce 00H at data outputs (D0-D7) for an unprotected sector. |
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