EPCS4 datasheet(17/38 Pages) ALTERA

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Chapter 3: Serial Configuration Devices (EPCS1, EPCS4, EPCS16, EPCS64, and EPCS128) Data Sheet

3–17

Serial Configuration Device Memory Access

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

None

All four sectors: 0 to 3

Sector 3

Three sectors: 0 to 2

Two sectors: 2 and 3

Two sectors: 0 and 1

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

None

All eight sectors: 0 to 7

Sector 7

Seven sectors: 0 to 6

Sectors 6 and 7

Six sectors: 0 to 5

Four sectors: 4 to 7

Four sectors: 0 to 3

All sectors

None

All sectors

None

All sectors

None

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

None

All sectors (32 sectors 0 to 31)

Upper 32nd (Sector 31)

Lower 31/32nds (31 sectors: 0 to 30)

Upper sixteenth (two sectors: 30 and 31)

Lower 15/16ths (30 sectors: 0 to 29)

Upper eighth (four sectors: 28 to 31)

Lower seven-eighths (28 sectors: 0 to 27)

Upper quarter (eight sectors: 24 to 31)

Lower three-quarters (24 sectors: 0 to 23)

Upper half (sixteen sectors: 16 to 31)

Lower half (16 sectors: 0 to 15)

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