EPCS Device Memory Access
Page 19
Table 12. Block Protection Bits in the EPCS64 Devices
Status Register
Content
Memory Content
BP2 BP1 BP0
Protected Area
Unprotected Area
Bit
0
Bit
0
Bit
0
None
All sectors (128 sectors: 0 to 127)
Lower 63/64ths (126 sectors: 0 to 125)
Lower 31/32nds (124 sectors: 0 to 123)
Lower 15/16ths (120 sectors: 0 to 119)
Lower seven-eights (112 sectors: 0 to 111)
Lower three-quarters (96 sectors: 0 to 95)
Lower half (64 sectors: 0 to 63)
None
0
0
1
Upper 64th (2 sectors: 126 and 127)
Upper 32nd (4 sectors: 124 to 127)
Upper sixteenth (8 sectors: 120 to 127)
Upper eighth (16 sectors: 112 to 127)
Upper quarter (32 sectors: 96 to 127)
Upper half (64 sectors: 64 to 127)
All sectors (128 sectors: 0 to 127)
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Table 13. Block Protection Bits in the EPCS128 Device
Status Register
Content
Memory Content
BP2 BP1 BP0
Protected Area
Unprotected Area
Bit
Bit
Bit
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
None
All sectors (64 sectors—0 to 63)
Lower 63/64ths (63 sectors—0 to 62)
Lower 31/32nds (62 sectors—0 to 61)
Lower 15/16ths (60 sectors—0 to 59)
Lower seven-eighths (56 sectors—0 to 55)
Lower three-quarters (48 sectors—0 to 47)
Lower half (32 sectors—0 to 31)
None
Upper 64th (1 sector—63)
Upper 32nd (2 sectors—62 to 63)
Upper 16th (4 sectors—60 to 63)
Upper 8th (8 sectors—56 to 63)
Upper quarter (16 sectors—48 to 63)
Upper half (32 sectors—32 to 63)
All sectors (64 sectors—0 to 63)
You can read the status register at any time, even during 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
0of the status register) before sending a new operation to the device. The
device can also read the status register continuously, as shown in Figure 9.
Figure 9. Read Status Operation Timing Diagram
nCS
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
DCLK
ASDI
DATA
Operation Code
Status Register Out
Status Register Out
High Impedance
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
MSB
MSB
April 2014 Altera Corporation
Serial Configuration (EPCS) Devices Datasheet
INTEL [ INTEL ]
