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MBM29F040C-70PFTN Datasheet(PDF) 11 Page - SPANSION |
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MBM29F040C-70PFTN Datasheet(HTML) 11 Page - SPANSION |
11 / 41 page 10 MBM29F040C-55/-70/-90 * : Outputs 01H at protected sector addresses and 00H at unprotected sector addresses. Write Device erasure and programming are accomplished via the command register. The contents of the register serve as inputs to the internal state machine. The state machine outputs dictate the function of the device. The command register itself does not occupy any addressable memory location. The register is a latch used to store the commands, along with the address and data information needed to execute the command. The command register is written by bringing WE to VIL, while CE is at VIL and OE is at VIH. Addresses are latched on the falling edge of WE or CE, whichever happens later; while data is latched on the rising edge of WE or CE, whichever happens first. Standard microprocessor write timings are used. Refer to AC Write Characteristics and the Erase/Programming Waveforms for specific timing parameters. Sector Protection The MBM29F040C features hardware sector protection. This feature will disable both program and erase operations in any number of sectors (0 through 8). The sector protection feature is enabled using programming equipment at the user’s site. The device is shipped with all sectors unprotected. To activate this mode, the programming equipment must force VID on address pin A9 and control pin OE, (suggest VID = 11.5 V) and CE = VIH. The sector addresses (A18, A17 and A16) should be set to the sector to be protected. Table 4 defines the sector address for each of the eight (8) individual sectors. Programming of the protection circuitry begins on the falling edge of the WE pulse and is terminated with the rising edge of the same. Sector addresses must be held constant during the WE pulse. See figures 11 and 17 sector protection waveforms and algorithm. Table 3 MBM29F040C Sector Protection Verify Autoselect Codes Type A18 A17 A16 A6 A1 A0 Code (HEX) DQ 7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 Manufacture’s Code XXX VIL VIL VIL 04H 00000100 Device Code X X X VIL VIL VIH A4H 10100100 Sector Protection Sector Addresses VIL VIH VIL 01H* 00000001 Table 4 Sector Address Tables Sector Address A18 A17 A16 Address Range SA0 0 0 0 00000H to 0FFFFH SA1 0 0 1 10000H to 1FFFFH SA2 0 1 0 20000H to 2FFFFH SA3 0 1 1 30000H to 3FFFFH SA4 1 0 0 40000H to 4FFFFH SA5 1 0 1 50000H to 5FFFFH SA6 1 1 0 60000H to 6FFFFH SA7 1 1 1 70000H to 7FFFFH |
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