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CAT93C57LA-1.8-GT2E Datasheet(PDF) 6 Page - Catalyst Semiconductor |
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CAT93C57LA-1.8-GT2E Datasheet(HTML) 6 Page - Catalyst Semiconductor |
6 / 9 page 6 CAT93C56/57 Doc. No. 1088, Rev. O Erase Upon receiving an ERASE command and address, the CS (Chip Select) pin must be deasserted for a minimum of tCSMIN. The falling edge of CS will start the self clocking clear cycle of the selected memory location. The clocking of the SK pin is not necessary after the device has entered the self clocking mode. The ready/busy status of the CAT93C56/57 can be determined by selecting the device and polling the DO pin. Once cleared, the content of a cleared location returns to a logical “1” state. Erase/Write Enable and Disable The CAT93C56/57 powers up in the write disable state. Any writing after power-up or after an EWDS (write disable) instruction must first be preceded by the EWEN (write enable) instruction. Once the write instruction is enabled, it will remain enabled until power to the device is removed, or the EWDS instruction is sent. The EWDS instruction can be used to disable all CAT93C56/57 write and clear instructions, and will prevent any accidental writing or clearing of the device. Data can be read normally from the device regardless of the write enable/disable status. Erase All Upon receiving an ERAL command, the CS (Chip Select) pin must be deselected for a minimum of tCSMIN. The falling edge of CS will start the self clocking clear cycle of all memory locations in the device. The clocking of the SK pin is not necessary after the device has entered the self clocking mode. The ready/busy status of the CAT93C56/57 can be determined by selecting the device and polling the DO pin. Once cleared, the contents of all memory bits return to a logical “1” state. Write All Upon receiving a WRAL command and data, the CS (Chip Select) pin must be deselected for a minimum of tCSMIN. The falling edge of CS will start the self clocking data write to all memory locations in the device. The clocking of the SK pin is not necessary after the device has entered the self clocking mode. The ready/busy status of the CAT93C56/57 can be determined by selecting the device and polling the DO pin. It is not necessary for all memory locations to be cleared before the WRAL command is executed. Figure 4. Erase Instruction Timing SK CS DI DO STANDBY HIGH-Z HIGH-Z 1 AN AN-1 BUSY READY STATUS VERIFY tSV tHZ tEW tCS 11 A0 |
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