S29CD016G SPANSION, S29CD016G Datasheet - Page 32

• Manufacturer Part Number: S29CD016G
• Description: 16 Megabit (512 K x 32-Bit) CMOS 2.5 Volt-only Burst Mode / Dual Boot / Simultaneous Read/Write Flash Memory
• Manufacturer: SPANSION

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Write Protect (WP#)
SecSi™ (Secured Silicon) Sector Protection
The device features a hardware protection option using a write protect pin that
prevents programming or erasing, regardless of the state of the sector’s Persis-
tent or Dynamic Protection Bits. The WP# pin is associated with the two
outermost 8Kbytes sectors in the 75% bank. The WP# pin has no effect on any
other sector. When WP# is taken to V
two outermost 8 Kbytes sectors in the 75% bank are disabled. By taking WP#
back to V
erase operations, depending upon the status of the individual sector Persistent or
Dynamic Protection Bits. If either of the two outermost sectors Persistent or Dy-
namic Protection Bits are programmed, program or erase operations are
inhibited. If the sector Persistent or Dynamic Protection Bits are both erased, the
two sectors are available for programming or erasing as long as WP# remains at
V
gram or erase operation of the two outermost sectors in the 75% bank.
The SecSi Sector is a 256-byte flash memory area that is either programmable
at the customer or by AMD at the request of the customer. The SecSi Sector Entry
command enables the host system to address the SecSi Sector for programming
or reading. The SecSi sector address range is 00000h–0003Fh for the ordering
option 00 and 7FFC0h–7FFFFh for the ordering option 01. Address range
00040h–007FFh for ordering option 0 and 7F800h–7FFBFh for ordering option 01
return invalid data when addressed with the SecSi Sector enabled.
The device allows Simultaneous Read/Write operation while the SecSi Sector is
enabled. However, there are a number of restrictions associated with Simulta-
neous Read/Write operations and device operation when the SecSi Sector is
enabled:
1) The SecSi Sector is not available for reading while the Password Unlock, any
2) Writing the corresponding DYB associated with the overlaid bootblock sector
3) Reading the corresponding DYB associated with the overlaid bootblock sector
4) All commands are available for execution when the SecSi Sector is enabled
5) Executing the Sector Erase command is permitted when the SecSi Sector is
IH
. The user must hold the WP# pin at either V
PPB program/erase operation, or Password programming are in progress.
Reading to any location in the small (25%) sector returns the status of these
operations until these operations have completed execution.
results in the DYB NOT being updated. This is only accomplished when the
SecSi sector is not enabled.
results in reading invalid data when the PPB Lock/DYB Verify command is is-
sued. This function is only accomplished when the SecSi Sector is not
enabled.
except the following list. Issuing the following commands while the SecSi
Sector is enabled results in the command being ignored.
enabled, however, there is no provision for erasing the SecSi Sector with the
All Unlock Bypass commands
CFI
Accelerated Program
Program and Sector Erase Suspend
Program and Sector Erase Resume
IH
, the two outermost 8 Kbytes sectors are enabled for program and
A d v a n c e
S29CD016G
IL
, programming and erase operations of the
I n f o r m a t i o n
IH
or V
IL
during the entire pro-
S29CD016_00_A4 November 5, 2004