s29gl01gs Meet Spansion Inc., s29gl01gs Datasheet - Page 34

• Manufacturer Part Number: s29gl01gs
• Manufacturer: Meet Spansion Inc.

34
5.3.6.2
5.3.6.3
5.3.6.4
5.3.6.5
 ASO Exit.
The following is a C source code example of using the CFI Entry and Exit functions. Refer to the Spansion
Low Level Driver User's Guide (available on www.spansion.com) for general information on Spansion flash
memory software development guidelines.
Status Register ASO
When the Status Register read command is issued, the current status is captured by the register and the
ASO is entered. The first read access in the Status Register ASO exits the ASO and returns to the address
space map in use when the Status Register read command was issued. No other command should be sent
before reading the status to exit the Status register ASO.
Secure Silicon Region ASO
The system can access the Secure Silicon Region by issuing the Secure Silicon Region Entry command
sequence during Read Mode. This entry command uses the Sector Address (SA) in the command to
determine which sector will be overlaid.
The Secure Silicon Region ASO allows the following activities:
 Read Secure Silicon Regions, using the same SA as used in the entry command.
 Program the customer Secure Silicon Region using the Word or Write Buffer Programming commands.
 ASO Exit using legacy Secure Silicon Exit command for backward software compatibility.
 ASO Exit using the common exit command for all ASO - alternative for a consistent exit method.
Lock Register ASO
The system can access the Lock Register by issuing the Lock Register entry command sequence during
Read Mode. This entry command does not use a sector address from the entry command. The Lock Register
appears at word location 0 in the device address space. All other locations in the device address space are
undefined.
The Lock Register ASO allows the following activities:
 Read Lock Register, using device address location 0.
 Program the customer Lock Register using a modified Word Programming command.
 ASO Exit using legacy Command Set Exit command for backward software compatibility.
 ASO Exit using the common exit command for all ASO - alternative for a consistent exit method.
Password ASO
The system can access the Password ASO by issuing the Password entry command sequence during Read
Mode. This entry command does not use a sector address from the entry command. The Password appears
at word locations 0 to 3 in the device address space. All other locations in the device address space are
undefined.
The Password ASO allows the following activities:
 Read Password, using device address location 0 to 3.
 Program the Password using a modified Word Programming command.
 Unlock the PPB Lock bit with the Password Unlock command.
 ASO Exit using legacy Command Set Exit command for backward software compatibility.
 ASO Exit using the common exit command for all ASO - alternative for a consistent exit method.
/* Example: CFI Entry command */
*( (UINT16 *)base_addr + 0x55 ) = 0x0098; /* write CFI entry command */
/* Example: CFI Exit command */
*( (UINT16 *)base_addr + 0x000 ) = 0x00F0; /* write cfi exit command */
D a t a
GL-S MirrorBit
S h e e t
®
Family
( P r e l i m i n a r y )
S29GL_128S_01GS_00_02 March 21, 2011