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P28F001BX-B150 Datasheet(PDF) 5 Page - Intel Corporation |
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P28F001BX-B150 Datasheet(HTML) 5 Page - Intel Corporation |
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5 / 33 page  28F001BX-T28F001BX-B Reprogrammable environments such as the per- sonal computer are ideal applications for the 28F001BX The internal state machine provides SRAM-like timings for program and erasure using the Command and Status Registers The blocking scheme allows BIOS update in the main and param- eter blocks while still providing recovery code in the boot block in the unlikely event a power failure oc- curs during an update or where BIOS code is cor- rupted Parameter blocks also provide convenient configuration storage backing up SRAM and battery configurations EISA systems for example can store hardware configurations in a flash parameter block reducing system SRAM Laptop BIOSs are becoming increasingly complex with the addition of power management software and extended system setup screens BIOS code complexity increases the potential for code updates after the sale but the compactness of laptop de- signs makes hardware updates very costly Boot block flash memory provides an inexpensive update solution for laptops while reducing laptop obsoles- cence For portable PCs and hand-held equipment the deep powerdown mode dramatically lowers sys- tem power requirements during periods of slow op- eration or sleep modes The 28F001BX gives the embedded system design- er several desired features The internal state ma- chine reduces the size of external code dedicated to the erase and program algorithms as well as freeing the microcontroller or microprocessor to respond to other system requests during program and erasure The four blocks allow logical segmentation of the entire embedded software the 8-KByte block for the boot code the 112-KByte block for the main pro- gram code and the two 4-KByte blocks for updatable parametric data storage diagnostic messages and data or extensions of either the boot code or pro- gram code The boot block is hardware protected against unauthorized write or erase of its vital code in the field Further the powerdown mode also locks out erase or write operations providing absolute data protection during system powerup or power loss This hardware protection provides obvious ad- vantages for safety related applications such as transportation military and medical The 28F001BX is well suited for minimum-chip embedded applica- tions ranging from communications to automotive 290406 – 5 Figure 5 28F001BX-T in a 80C188 System 290406 – 6 Figure 6 28F001BX-B in a 80C51 System 5 |
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