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EPCS4 数据表(PDF) 17 Page - Altera Corporation |
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EPCS4 数据表(HTML) 17 Page - Altera Corporation |
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17 / 38 page  Chapter 3: Serial Configuration Devices (EPCS1, EPCS4, EPCS16, EPCS64, and EPCS128) Data Sheet 3–17 Serial Configuration Device Memory Access © December 2009 Altera Corporation Configuration Handbook (Complete Two-Volume Set) Resetting the write enable latch bit to 0 indicates that no write or erase cycle will be accepted. Set the write enable latch bit to 1 before every write bytes, write status, erase bulk, and erase sector operation. The non-volatile block protect bits determine the area of the memory protected from being written or erased unintentionally. Table 3–9 through Table 3–13 list the protected area in the serial configuration devices with reference to the block protect bits. The erase bulk operation is only available when all the block protect bits are 0. When any of the block protect bits are set to 1, the relevant area is protected from being written by write bytes operations or erased by erase sector operations. Table 3–9. Block Protection Bits in EPCS1 Status Register Content Memory Content BP1 Bit BP0 Bit Protected Area Unprotected Area 00 None All four sectors: 0 to 3 01 Sector 3 Three sectors: 0 to 2 10 Two sectors: 2 and 3 Two sectors: 0 and 1 11 All sectors None Table 3–10. Block Protection Bits in EPCS4 Status Register Content Memory Content BP2 Bit BP1 Bit BP0 Bit Protected Area Unprotected Area 00 0 None All eight sectors: 0 to 7 00 1 Sector 7 Seven sectors: 0 to 6 01 0 Sectors 6 and 7 Six sectors: 0 to 5 01 1 Four sectors: 4 to 7 Four sectors: 0 to 3 10 0 All sectors None 10 1 All sectors None 11 0 All sectors None 11 1 All sectors None Table 3–11. Block Protection Bits in EPCS16 (Part 1 of 2) Status Register Content Memory Content BP2 Bit BP1 Bit BP0 Bit Protected Area Unprotected Area 00 0 None All sectors (32 sectors 0 to 31) 00 1 Upper 32nd (Sector 31) Lower 31/32nds (31 sectors: 0 to 30) 01 0 Upper sixteenth (two sectors: 30 and 31) Lower 15/16ths (30 sectors: 0 to 29) 01 1 Upper eighth (four sectors: 28 to 31) Lower seven-eighths (28 sectors: 0 to 27) 10 0 Upper quarter (eight sectors: 24 to 31) Lower three-quarters (24 sectors: 0 to 23) 10 1 Upper half (sixteen sectors: 16 to 31) Lower half (16 sectors: 0 to 15) |
类似零件编号 - EPCS4 |
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类似说明 - EPCS4 |
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