EPCS64 datasheet(18/38 Pages) ALTERA

18 / 38 page

3–18

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

Serial Configuration Device Memory Access

Configuration Handbook (Complete Two-Volume Set)

Altera Corporation

You can read the status register 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 Figure 3–9.

All sectors (32 sectors: 0 to 31)

None

All sectors (32 sectors: 0 to 31)

None

Table 3–12. Block Protection Bits in EPCS64

Status Register

Content

Memory Content

BP2

Bit

BP1

Bit

BP0

Bit

Protected Area

Unprotected Area

000

None

All sectors (128 sectors: 0 to 127)

001

Upper 64th (2 sectors: 126 and 127)

Lower 63/64ths (126 sectors: 0 to 125)

010

Upper 32nd (4 sectors: 124 to 127)

Lower 31/32nds (124 sectors: 0 to 123)

011

Upper sixteenth (8 sectors: 120 to 127)

Lower 15/16ths (120 sectors: 0 to 119)

100

Upper eighth (16 sectors: 112 to 127)

Lower seven-eighths (112 sectors: 0 to 111)

101

Upper quarter (32 sectors: 96 to 127)

Lower three-quarters (96 sectors: 0 to 95)

110

Upper half (64 sectors: 64 to 127)

Lower half (64 sectors: 0 to 63)

111

All sectors (128 sectors: 0 to 127)

None

Table 3–11. Block Protection Bits in EPCS16 (Part 2 of 2)

Status Register

Content

Memory Content

BP2

Bit

BP1

Bit

BP0

Bit

Protected Area

Unprotected Area

Table 3–13. Block Protection Bits in EPCS128

Status Register

Content

Memory Content

BP2

Bit

BP1

Bit

BP0

Bit

Protected Area

Unprotected Area

000

None

All sectors (64 sectors: 0 to 63)

001

Upper 64th (1 sector: 63)

Lower 63/64ths (63 sectors: 0 to 62)

010

Upper 32nd (2 sectors: 62 to 63)

Lower 31/32nds (62 sectors: 0 to 61)

011

Upper 16th (4 sectors: 60 to 63)

Lower 15/16ths (60 sectors: 0 to 59)

100

Upper 8th (8 sectors: 56 to 63)

Lower seven-eighths (56 sectors: 0 to 55)

101

Upper quarter (16 sectors: 48 to 63)

Lower three-quarters (48 sectors: 0 to 47)

110

Upper half (32 sectors: 32 to 63)

Lower half (32 sectors: 0 to 31)

111

All sectors (64 sectors: 0 to 63)

None

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