ep2sgx60e Altera Corporation, ep2sgx60e Datasheet - Page 24

• Manufacturer Part Number: ep2sgx60e
• Description: 4. Serial Configuration Devices Epcs1, Epcs4, Epcs16, Epcs64, And Epcs128 Data Sheet
• Manufacturer: Altera Corporation

Serial Configuration Device Memory Access
4–24
Configuration Handbook, Volume 2
Setting the write in progress bit to 1 indicates that the serial configuration
device is busy with a write or erase cycle. Resetting the write in progress
bit to 0 means no write or erase cycle is in progress.
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.
through
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 4–16. Block Protection Bits in EPCS1
Table 4–17. Block Protection Bits in EPCS4
BP2 Bit
Status Register Content
BP1 Bit
Status Register Content
0
0
0
0
1
1
1
1
0
0
1
1
Table 4–20
BP1 Bit
0
0
1
1
0
0
1
1
BP0 Bit
0
1
0
1
show the protected area in the serial configuration
BP0 Bit
0
1
0
1
0
1
0
1
None
Sector 3
Two sectors: 2 and 3
All sectors
None
Sector 7
Sectors 6 and 7
Four sectors: 4 to 7
All sectors
All sectors
All sectors
All sectors
Protected Area
Protected Area
Memory Content
Memory Content
All four sectors: 0 to 3
Three sectors: 0 to 2
None
Two sectors: 0 and 1
All eight sectors: 0 to 7
Seven sectors: 0 to 6
Six sectors: 0 to 5
Four sectors: 0 to 3
None
None
None
None
Unprotected Area
Unprotected Area
Altera Corporation
Table 4–16
May 2008