EN29GL256H EON [Eon Silicon Solution Inc.], EN29GL256H Datasheet - Page 26

• Manufacturer Part Number: EN29GL256H
• Description: 256 Megabit (32768K x 8-bit / 16384K x 16-bit) Flash Memory Page mode Flash Memory, CMOS 3.0 Volt-only
• Manufacturer: EON [Eon Silicon Solution Inc.]

The Lock Register consists of 4 bits. The Secured Silicon Sector Protection Bit is DQ0, Persistent
Protection Mode Lock Bit is DQ1, Persistent Sector Protection OTP bit is DQ3 and DYB Lock Boot Bit is
DQ4. If DQ0 is ‘0’, it means that the Customer Secured Silicon area is locked and if DQ0 is ‘1’, it means
that it is unlocked. When DQ1 is set to ‘0’, the device is used in the Persistent Protection Mode. DQ3 is
programmed in the EON factory. When the device is programmed to disable all PPB erase command,
DQ3 outputs a ‘0’, when the lock register bits are read. Similarly, if the device is programmed to enable
Advanced Sector Protection/Unprotection
The Advanced Sector Protection/Unprotection feature disables or enables programming or erase
operations in any or all sectors and can be implemented through software and/or hardware methods,
which are independent of each other. This section describes the various methods of protecting data
stored in the memory array. An overview of these methods in shown in Figure 7.
Figure 7. Advanced Sector Protection/Unprotection
Lock Register
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
Dynamic Protection Bit
5. 0 = Sector Protected,
6. DYB bits are only effective for
7. Volatile Bits: defaults to
1 = Sector Unprotected.
sectors that not protected via
PPB locking mechanism.
unprotected after power up.
DYB 248
DYB 249
DYB 250
DYB 251
DYB 252
DYB 253
DYB 254
DYB 255
(DYB)
DYB 4
DYB 5
DYB 6
DYB 7
DYB 0
DYB 1
DYB 2
DYB 3
Memory Array
Sector 248
Sector 249
Sector 250
Sector 251
Sector 252
Sector 253
Sector 254
Sector 255
Sector 0
Sector 1
Sector 2
Sector 3
Sector 4
Sector 5
Sector 6
Sector 7
Rev. G, Issue Date: 2011/01/17
26
©2004 Eon Silicon Solution, Inc.,
Persistent Protection
8. 0 = Sector Protected,
9. PPBs programmed individually,
10.Sector 0~3 and 252~255 have
1 = Sector Unprotected.
but cleared collectively.
PPB for each sector. Sector
4~251 are 1 PPB per 4 sectors.
Bit (PPB)
PPB 65
PPB 66
PPB 67
PPB 68
PPB 69
PPB 4
PPB 0
PPB 1
PPB 2
PPB 3
EN29GL256H/L
1. 0 = PPBs Locked,
2. Bit is volatile, and defaults to
3. Programming to “0” locks all
4. Once programmed to “0”,
1 = PPBs Unlocked.
“1” on reset.
PPBs to their current state.
requires hardware reset to
unlock.
PPB Lock Bit
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