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28F008SA-L Datasheet(PDF) 10 Page - Intel Corporation |
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28F008SA-L Datasheet(HTML) 10 Page - Intel Corporation |
10 / 28 page 28F008SA-L Deep Power-Down The 28F008SA-L offers a deep power-down feature entered when RP is at VIL Current draw thru VCC is 020 mA typical in deep powerdown mode with current draw through VPP typically 01 mA During read modes RP -low deselects the memory places output drivers in a high-impedence state and turns off all internal circuits The 28F008SA-L re- quires time tPHQV (see AC Characteristics-Read- Only Operations) after return from powerdown until initial memory access outputs are valid After this wakeup interval normal operation is restored The Command User Interface is reset to Read Array and the upper 5 bits of the Status Register are cleared to value 10000 upon return to normal operation During block erase or byte write modes RP low will abort either operation Memory contents of the block being altered are no longer valid as the data will be partially written or erased Time tPHWL after RP goes to logic-high (VIH) is required before an- other command can be written This use of RP during system reset is important with automated writeerase devices When the sys- tem come out of reset it expects to read from the flash memory Automated flash memories provide status information when accessed during write erase modes If a CPU reset occurs with no flash memory reset proper CPU initialization would not occur because the flash memory would be providing the status information instead of array data Intel’s Flash Memories allow proper CPU initialization fol- lowing a system reset through the use of the RP input In this application RP is controlled by the same RESET signal that resets the system CPU Intelligent Identifier Operation The Intelligent Identifier operation outputs the manu- facturer code 89H and the device code A2H for the 28F008SA-L The system CPU can then auto- matically match the device with its proper block erase and byte write algorithms The manufacturer- and device-codes are read via the Command User Interface Following a write of 90H to the Command User Interface a read from address location 00000H outputs the manufacturer code (89H) A read from address 00001H outputs the device code (A2H) It is not necessary to have high voltage applied to VPP to read the Intelligent Identifiers from the Command User Interface Table 3 Command Definitions Command Cycles Req’d Bus Notes First Bus Cycle Second Bus Cycle Operation Address Data Operation Address Data Read ArrayReset 1 1 Write X FFH Intelligent Identifier 3 2 3 4 Write X 90H Read IA IID Read Status Register 2 3 Write X 70H Read X SRD Clear Status Register 1 Write X 50H Erase SetupErase Confirm 2 2 Write BA 20H Write BA D0H Erase SuspendErase Resume 2 Write X B0H Write X D0H Byte Write SetupWrite 2 2 3 5 Write WA 40H Write WA WD Alternate Byte Write SetupWrite 2 2 3 5 Write WA 10H Write WA WD NOTES 1 Bus operations are defined in Table 2 2 IA e Identifier Address 00H for manufacturer code 01H for device code BA e Address within the block being erased WA e Address of memory location to be written 3 SRD e Data read from Status Register See Table 4 for a description of the Status Register bits WD e Data to be written at location WA Data is latched on the rising edge of WE IID e Data read from Intelligent Identifiers 4 Following the Intelligent Identifier command two read operations access manufacture and device codes 5 Either 40H or 10H are recognized by the WSM as the Byte Write Setup command 6 Commands other than those shown above are reserved by Intel for future device implementations and should not be used 10 |
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