EPCS64 Altera Corporation, EPCS64 Datasheet - Page 14

• Manufacturer Part Number: EPCS64
• Description: (EPCS1 - EPCS64) Serial Configuration Devices
• Manufacturer: Altera Corporation

Serial Configuration Device Memory Access
4–14
Configuration Handbook, Volume 2
available when all the block protect bits are 0. When any of the block
protect bits are set to one, the relevant area is protected from being
written by write bytes operations or erased by erase sector operations.
The status register can be read at any time, even while a write or erase
cycle is in progress. When one of these cycles is in progress, you can check
the write in progress bit (bit 0 of the status register) before sending a new
operation to the device. The device can also read the status register
continuously, as shown in
Table 4–9. Block Protection Bits in EPCS4 Devices
Table 4–10. Block Protection Bits in EPCS1
BP2 Bit
Status Register Content
BP1 Bit
Status Register Content
0
0
0
0
1
1
1
1
0
0
1
1
Core Version a.b.c variable
BP1 Bit
0
0
1
1
0
0
1
1
BP0 Bit
0
1
0
1
BP0 Bit
0
1
0
1
0
1
0
1
Figure
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
4–9.
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
July 2004