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F49L040A-90T Datasheet(PDF) 5 Page - Elite Semiconductor Memory Technology Inc. |
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F49L040A-90T Datasheet(HTML) 5 Page - Elite Semiconductor Memory Technology Inc. |
5 / 41 page EFST F49L040A Elite Flash Storage Technology Inc. Publication Date : Apr. 2005 Revision: 1.0 5/41 7. FUNCTIONAL DESCRIPTION 7.1 Device operation This section describes the requirements and use of the device bus operations, which are initiated through the internal command register. The register is composed of latches that store the command, address and data information needed to execute the command. The contents of the register serve as inputs to the internal state machine. The state machine outputs dictate the function of the device. The F49L040A features various bus operations as Table 2. Table 2. F49L040A Operation Modes Selection ADDRESS DESCRIPTION CE OE WE A18 | A13 A12 | A10 A9 A8 | A7 A6 A5 | A2 A1 A0 DQ0~DQ7 Read L L H AIN Dout Write L H L AIN DIN Output Disable L H H X High Z Standby H X X X High Z Sector Protect(2) L H L SA X VID X L X H L DIN Sector Unprotect(2) L H L SA X VID X H X H L DIN Auto-select See Table 3 Notes: 1. L= Logic Low = VIL, H= Logic High = VIH, X= Don't Care, SA= Sector Address, VID=11.5V to 12.5V. AIN= Address In, DIN = Data In, Dout = Data Out. 2. The sector protect and unprotect functions may also be implemented via programming equipment. Table 3. F49L040A Auto-Select Mode (High Voltage Method) ADDRESS DQ0~DQ7 DESCRIPTION CE OE WE A18 | A13 A12 | A10 A9 A8 | A4 A6 A3 A2 A1 A0 L L H X X VID X X L H L L 7FH L L H X X VID X X H L L L 7FH L L H X X VID X X H H L L 7FH (Manufacturer ID:EFST) L L H X X VID X X L L L L 8CH (Device ID: F49L040A) L L H X X VID XXXX L H 4FH Sector Protection Verify L L H SA X VID X L X X H L Code(2) Notes : 1.Manufacturer and device codes may also be accessed via the software command sequence in Table 4. 2. Code=00H means unprotected. Code =01H means protected. |
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