EN29GL128HL Datasheet, PDF (30/54 Pages) Eon Silicon Solution Inc. – 128 Megabit (16384K x 8-bit / 8192K x 16-bit) Flash Memory Page mode Flash Memory, CMOS 3.0 Volt-only

EN29GL128H/L
• The ACC function is not available when the Secured Silicon Sector is enabled.
Table 8. Secured Silicon Sector Addresses
Secured Silicon Sector Address Range
000000h-000007h Reserve for Factory
000008h-00007Fh Determined by customer
Customer Lockable Secured Silicon Sector
The Customer Lockable Secured Silicon Sector is always shipped unprotected (DQ0 set to “1”),
allowing
customers to utilize that sector in any manner they choose. If the security feature is not required, the
Secured Silicon Sector can be treated as an additional Flash memory space.
Please note the following:
• Once the Secured Silicon Sector area is protected, the Secured Silicon Sector Indicator Bit (DQ0) is
permanently set to “0.”
• The Secured Silicon Sector can be read any number of times, but can be programmed and locked
only once. The Secured Silicon Sector lock must be used with caution as once locked, there is no
procedure available for unlocking the Secured Silicon Sector area and none of the bits in the
Secured Silicon Sector memory space can be modified in any way.
• The accelerated programming (ACC) is not available when the Secured Silicon Sector is enabled.
• Once the Secured Silicon Sector is locked and verified, the system must write the Exit Secured
Silicon Sector Region command sequence which return the device to the memory array at sector 0.
• The address 0h~7h in Secured Silicon Sector is reserved for Factory.
Secured Silicon Sector Entry/Exit Command Sequences
The system can access the Secured Silicon Sector region by issuing the three-cycle Enter Secured
Silicon Sector command sequence. The device continues to access the Secured Silicon Sector region
until the system issues the four-cycle Exit Secured Silicon Sector command sequence.
The Secured Silicon Sector Entry Command allows the following commands to be executed
• Read customer and factory Secured Silicon areas
• Program the customer Secured Silicon Sector
After the system has written the Enter Secured Silicon Sector command sequence, it may read the
Secured Silicon Sector by using the addresses normally occupied by sector SA0 within the memory
array. This mode of operation continues until the system issues the Exit Secured Silicon Sector
command sequence, or until power is removed from the device.
COMMON FLASH INTERFACE (CFI)
The common flash interface (CFI) specification outlines device and host systems software
interrogation handshake, which allows specific vendor-specified software algorithms to be used for
entire families of devices. Software support can then be device-independent, JEDEC ID-
independent, and forward- and backward-compatible for the specified flash device families. Flash
vendors can standardize their existing interfaces for long-term compatibility.
This device enters the CFI Query mode when the system writes the CFI Query command, 98h, to
address 55h in word mode (or address AAh in byte mode), any time the device is ready to read
array data.
This Data Sheet may be revised by subsequent versions
30
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc.,
Rev. L, Issue Date: 2012/06/05
www.eonssi.com