EN29GL064 EON [Eon Silicon Solution Inc.], EN29GL064 Datasheet - Page 32

• Manufacturer Part Number: EN29GL064
• Description: 64 Megabit (8192K x 8-bit / 4096K x 16-bit) Flash Memory Page mode Flash Memory, CMOS 3.0 Volt-only
• Manufacturer: EON [Eon Silicon Solution Inc.]

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
all PPB erase command, DQ3 outputs a ‘1’ when the lock register bits are read. Likewise the DQ4 bit is
also programmed in the EON Factory. DQ4 is the bit which indicates whether Volatile Sector Protection
Bit (DYB) is protected or not after boot-up. When the device is programmed to set all Volatile Sector
Protection Bit protected after power-up, DQ4 outputs a ‘0’ when the lock register bits are read. Similarly,
when the device is programmed to set all Volatile Sector Protection Bit unprotected after power-up,
DQ4 outputs a ‘1’. Each of these bits in the lock register are non-volatile. DQ15- DQ5 are reserved and
will be 1’s.
Table 6. Lock Register
Notes:
1. After the Lock Register Bits Command Set Entry command sequence is written, reads and writes for all Sector are disabled,
2. Only DQ0 could be change by Lock Register Bits Command for user. Others bits were set by Factory.
After selecting a sector protection method, each sector can operate in any of the following three states:
1. Constantly locked: The selected sectors are protected and can not be reprogrammed unless PPB
2. Dynamically locked: The selected sectors are protected and can be altered via software commands.
3. Unlocked: The sectors are unprotected and can be erased and/or programmed.
Persistent Protection Bits
The Persistent Protection Bits are unique and nonvolatile. For uniform sector device, Sector 0~3 and
124~127 have one PPB for each sectors and for Sector 4~123 have one PPB every four sectors. For
top boot sector device, Sector 0~123 are 1 PPB per 4 sectors and Sector 124~134 have PPB for each
boot sector. For bottom boot sector device, Sector 0~10 have PPB for each boot sector and Sector
11~134 are 1 PPB per 4 sectors(refer to Figure 8a, 8b, 8c and Table 3a, 3b, 3c). The PPB has the
same endurances as the Flash memory. Preprogramming and verification prior to erasure are handled
by the device, and therefore do not require system monitoring.
Notes
1. Each PPB is individually programmed and all are erased in parallel.
2. While programming PPB for the four sectors and Data polling on programming PPB address, array
3. Entry command disables reads and writes for all sectors selected.
4. Reads within that sector return the PPB status for that sector.
5. All Reads must be performed using the read mode.
6. The specific sector address are written at the same time as the program command.
7. If the PPB Lock Bit is set, the PPB Program or erase command does not execute and times-out
8. There are no means for individually erasing a specific PPB and no specific sector address is
9. Exit command must be issued after the execution which resets the device to read mode and re-
10. The programming state of the PPB for given sectors can be verified by writing a PPB Status Read
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
(default = 1)
Reserved DYB Lock Boot Bit
without programming or erasing the PPB.
required for this operation.
enables reads and writes for all sectors.
Command to the device as described by the flow chart shown in Figure 9. User only can use DQ6
DQ15-5
while reads from other sectors are allowed until exiting this mode.
and RY/BY# pin to detect programming status.
data can not be read from any sectors.
lock bit is cleared via hardware reset, or power cycle.
1 = unprotected all
DYB after boot-up
(default = 1)
0 = protected all
DYB after boot-up
DQ4
1 = All PPB Erase
Command enabled
(default = 1)
0 = All PPB Erase
Command disabled
PPB One Time
Programmable Bit
Rev. M, Issue Date: 2011/04/13
DQ3
32
(default = 1)
Reserved
©2004 Eon Silicon Solution, Inc.,
DQ2
0 = Persistent
Protection enabled
(default = 0)
Protection Mode
Persistent
Lock Bit
DQ1
EN29GL064
www.eonssi.com
1 = unprotect
(default = 1)
Silicon Sector
0 = protected
Protection Bit
Secured
DQ0