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TP28F001BX-B90 Datasheet(PDF) 8 Page - Intel Corporation |
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TP28F001BX-B90 Datasheet(HTML) 8 Page - Intel Corporation |
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8 / 33 page  28F001BX-T28F001BX-B The use of RP during system reset is important with automated writeerase devices When the sys- tem comes 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 94H for the 28F001BX-T and 95H for the 28F001BX-B Pro- gramming equipment or the system CPU can then automatically match the device with its proper erase and programming algorithms PROGRAMMING EQUIPMENT CE and OE at a logic low level (VIL) with A9 at high voltage VID (see DC Characteristics) activates this operation Data read from locations 00000H and 00001H represent the manufacturer’s code and the device code respectively IN-SYSTEM PROGRAMMING The manufacturer- and device-codes can also be read via the Command Register Following a write of 90H to the Command Register a read from address location 00000H outputs the manufacturer code (89H) A read from address 00001H outputs the de- vice code (94H for the 28F001BX-T and 95H for the 28F001BX-B) It is not necessary to have high volt- age applied to VPP to read the Intelligent Identifiers from the Command Register Write Writes to the Command Register allow read of de- vice data and Intelligent Identifiers They also con- trol inspection and clearing of the Status Register Additionally when VPP e VPPH the Command Reg- ister controls device erasure and programming The contents of the register serve as input to the internal state machine The Command Register itself does not occupy an addressable memory location The register is a latch used to store the command and address and data information needed to execute the command Erase Setup and Erase Confirm commands require both appropriate command data and an address within the block to be erased The Program Setup Com- mand requires both appropriate command data and the address of the location to be programmed while the Program command consists of the data to be written and the address of the location to be pro- grammed The Command Register is written by bringing WE to a logic-low level (VIL) while CE is low Address- es and data are latched on the rising edge of WE Standard microprocessor write timings are used Refer to AC Write Characteristics and the AC Wave- form for Write Operations Figure 13 for specific tim- ing parameters COMMAND DEFINITIONS When VPPL is applied to the VPP pin read opera- tions from the Status Register intelligent identifiers or array blocks are enabled Placing VPPH on VPP enables successful program and erase operations as well Device operations are selected by writing specific commands into the Command Register Table 3 de- fines these 28F001BX commands Read Array Command Upon initial device powerup and after exit from deep-powerdown mode the 28F001BX defaults to Read Array mode This operation is also initiated by writing FFH into the Command Register Microproc- essor read cycles retrieve array data The device re- mains enabled for reads until the Command Regis- ter contents are altered Once the internal write state machine has started an erase or program op- eration the device will not recognize the Read Array command until the WSM has completed its opera- tion The Read Array command is functional when VPP e VPPL or VPPH Intelligent Identifier Command for In-System Programming The 28F001BX contains an Intelligent Identifier op- eration to supplement traditional PROM-program- ming methodology The operation is initiated by writ- ing 90H into the Command Register Following the command write a read cycle from address 00000H retrieves the manufacturer code of 89H A read cy- cle from address 00001H returns the device code of 94H (28F001BX-T) or 95H (28F001BX-B) To termi- nate the operation it is necessary to write another valid command into the register Like the Read Array command the Intelligent Identifier command is func- tional when VPP e VPPL or VPPH 8 |
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