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MBM29F400TC-55PFTR Datasheet(PDF) 11 Page - Fujitsu Component Limited. |
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MBM29F400TC-55PFTR Datasheet(HTML) 11 Page - Fujitsu Component Limited. |
11 / 47 page 11 MBM29F400TC-55/-70/-90/MBM29F400BC-55/-70/-90 *1: A-1 is for Byte mode. *2: Outputs 01H at protected sector addresses and outputs 00H at unprotected sector addresses. (B): Byte mode (W): Word mode 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 MBM29F400TC/BC features hardware sector protection. This feature will disable both program and erase operations in any number of sectors (0 through 10). The sector protection feature is enabled using programming equipment at the user’s site. The device is shipped with all sectors unprotected. Table 4 .1 MBM29F400TC/BC Sector Protection Verify Autoselect Codes Type A12 to A17 A6 A1 A0 A-1*1 Code (HEX) Manufacturer’s Code X VIL VIL VIL VIL 04H Device Code MBM29F400TC Byte XVIL VIL VIH VIL 23H Word X 2223H MBM29F400BC Byte XVIL VIL VIH VIL ABH Word X 22ABH Sector Protection Sector Addresses VIL VIH VIL VIL 01H*2 Table 4 .2 Expanded Autoselect Code Table Type Code DQ15 DQ14 DQ13 DQ12 DQ11 DQ10 DQ9 DQ8 DQ 7 DQ 6 DQ 5 DQ 4 DQ 3 DQ 2 DQ 1 DQ 0 Manufacturer’s Code 04H A-1/0 0000000 0 0 0 0 0 1 0 0 Device Code MBM29F400TC (B) (W) 23H 2223 H A-1 0 HI-Z 0 HI-Z 1 HI-Z 0 HI-Z 0 HI-Z 0 HI-Z 1 HI-Z 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 1 1 MBM29F400BC (B) (W) ABH 22AB H A-1 0 HI-Z 0 HI-Z 1 HI-Z 0 HI-Z 0 HI-Z 0 HI-Z 1 HI-Z 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 1 Sector Protection 01H A-1/0 0000000 0 0 0 0 0 0 0 1 |
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