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| TD27C64-20资料 | |
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TD27C64-20 PDF Download |
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File Size : 116 KB
Manufacturer:INTEL/REI Description:CHIP ERASE: If the boot block lockout has been enabled, the Chip Erase function will erase Parameter Block 1, Parameter Block 2, Main Memory Block 1, and Main Mem- ory Block 2 but not the boot block. If the Boot Block Lockout has not been enabled, the Chip Erase function will erase the entire chip. After the full chip erase the device will return back to read mode. Any command during chip erase will be ignored. SECTOR ERASE: As an alternative to a full chip erase, the device is organized into sectors that can be individually erased. There are two 8K-byte parameter block sections and two main memory blocks. The 8K-byte parameter block sections can be independently erased and repro- grammed. The two main memory sections are designed to be used as alternative memory sectors. That is, whenever one of the blocks has been erased and reprogrammed, the other block should be erased and reprogrammed before the first block is again erased. The Sector Erase command is a six bus cycle operation. The sector address is latched on the falling WE edge of the sixth cycle while the 30H data input command is latched at the rising edge of WE. The sector erase starts after the rising edge of WE of the sixth cycle. The erase operation is internally controlled; it will automatically time to completion. BYTE PROGRAMMING: Once the memory array is erased, the device is programmed (to a logical 0) on a byte-by-byte basis. Please note that a data 0 cannot be programmed back to a 1; only erase operations can con- vert 0s to 1s. Programming is accomplished via the internal device command register and is a 4 bus cycle operation (please refer to the Command Definitions table). The device will automatically generate the required internal program pulses. The program cycle has addresses latched on the falling edge of WE or CE, whichever occurs last, and the data latched on the rising edge of WE or CE, whichever occurs first. Programming is completed after the specified tBP cycle time. The DATA polling feature may also be used to indi- cate the end of a program cycle. BOOT BLOCK PROGRAMMING LOCKOUT: The device has one designated block that has a programming lockout feature. This feature prevents programming of data in the designated block once the feature has been enabled. The size of the block is 16K bytes. This block, referred to as the boot block, can contain secure code that is used to bring up the system. Enabling the lockout feature will allow the boot code to stay in the device while data in the rest of the device is updated. This feature does not have to be acti- vated; the boot blocks usage as a write protected region is optional to the user. The address range of the boot block is 00000 to 03FFF for the AT49BV/LV001(N) while the address range of the boot block is 1C000 to 1FFFF for the AT49BV/LV001(N)T. |
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| 1PCS | 100PCS | 1K | 10K | ||
| 价 格 | |||||
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型 号：TD27C64-20 厂 家：INTEL/REI 封 装：DIP 批 号：97+ 数 量：3520 说 明：自家库存-房间现货 |
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运 费：20 所在地：深圳市 新旧程度： |
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