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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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S71GS256 데이터시트(PDF) 53 Page - SPANSION |
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S71GS256 데이터시트(HTML) 53 Page - SPANSION |
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53 / 195 page  December 15, 2004 S29GLxxxN_MCP_A1 S29GLxxxN MirrorBitTM Flash Family 53 Ad vance Info rmat i o n Table 5. Autoselect Codes, (High Voltage Method) Legend: L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care. Sector Protection The device features several levels of sector protection, which can disable both the program and erase operations in certain sectors or sector groups: Persistent Sector Protection A command sector protection method that replaces the old 12 V controlled pro- tection method. Password Sector Protection A highly sophisticated protection method that requires a password before changes to certain sectors or sector groups are permitted WP# Hardware Protection A write protect pin that can prevent program or erase operations in the outermost sectors. The WP# Hardware Protection feature is always available, independent of the software managed protection method chosen. Selecting a Sector Protection Mode All parts default to operate in the Persistent Sector Protection mode. The cus- tomer must then choose if the Persistent or Password Protection method is most desirable. There are two one-time programmable non-volatile bits that define which sector protection method will be used. If the customer decides to continue Description CE# OE# WE # A22 to A15 A14 to A10 A9 A8 to A7 A6 A5 to A4 A3 to A2 A1 A0 DQ8 to DQ15 DQ7 to DQ0 Manufacturer ID: Spansion Product LL H X X VID X L X L L L 00 01h Cycle 1 LL H X X VID XL X LL H 22 7Eh Cycle 2 H H L 22 23h Cycle 3 H H H 22 01h Cycle 1 LL H X X VID XL X LL H 22 7Eh Cycle 2 H H L 22 22h Cycle 3 H H H 22 01h Cycle 1 LL H X X VID XL X LL H 22 7Eh Cycle 2 H H L 22 21h Cycle 3 H H H 22 01h Sector Group Protection Verification LL H SA X VID XL X L H L X 01h (protected), 00h (unprotected) Secured Silicon Sector Indicator Bit (DQ7), WP# protects highest address sector LL H X X VID XL X L H H X 98h (factory locked), 18h (not factory locked) Secured Silicon Sector Indicator Bit (DQ7), WP# protects lowest address sector LL H X X VID XL X L H H X 88h (factory locked), 08h (not factory locked) |
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