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AM29F040-70EC Datasheet(PDF) 8 Page - Advanced Micro Devices |
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AM29F040-70EC Datasheet(HTML) 8 Page - Advanced Micro Devices |
8 / 33 page 8 Am29F040 Table 2. Am29F040 Autoselect Codes *Outputs 01H at protected sector addresses Table 3. 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 Am29F040 features hardware sector protection. This feature will disable both program and erase operations in any number of sectors (0 through 8). The sector protect feature is enabled using programming equipment at the user’s site. The device is shipped with all sectors unprotected. Alternatively, AMD may pro- gram and protect sectors in the factory prior to shipping the device (AMD’s ExpressFlash™ Service). It is also possible to determine if a sector is protected in the system by writing an Autoselect command. Performing a read operation at the address location XX02H, where the higher order addresses (A16, A17, and A18) are used to select the desired sector. The device produces a logical “1” at DQ0 for a pro- tected sector and a logical “0” for an unprotected sector. See Table 2 for Autoselect codes. Sector Unprotect The Am29F040 also features a sector unprotect mode so that a protected sector may be unprotected to incorporate any changes in the code. The sector unpro- tect is enabled using programming equipment at the user’s site. Command Definitions Device operations are selected by writing specific ad- dress and data sequences into the command register. Writing incorrect address and data values or writing them in the improper sequence will reset the device to read mode. Table 4 defines the valid register command sequences. Note that the Erase Suspend (B0) and Erase Resume (30) commands are valid only while the Sector Erase operation is in progress. Either of the two reset commands will reset the device (when applicable). Type A18 A17 A16 A6 A1 A0 Code (HEX) DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 Manufacturer ID XXX VIL VIL VIL 01H 00000001 Am29F040 Device ID XXX VIL VIL VIH A4H 10100100 Sector Protection Sector Addresses VIL VIH VIL 01H* 00000001 A18 A17 A16 Address Range SA0 0 0 0 00000h–0FFFFh SA1 0 0 1 10000h–1FFFFh SA2 0 1 0 20000h–2FFFFh SA3 0 1 1 30000h–3FFFFh SA4 1 0 0 40000h–4FFFFh SA5 1 0 1 50000h–5FFFFh SA6 1 1 0 60000h–6FFFFh SA7 1 1 1 70000h–7FFFFh |
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