Hardware manual

Windows XP Embedded Reference Manual
1-8
4.2 Acress operation to the CF card of the Write filter
 When the Write Filter is enabled
• Read: Direct access to CF card
• Write: Access to the memory
 When the Write Filter is disabled
• Read: Direct access to CF card
• Write: Direct access to CF card
• When the added or changed data is on the memory, the data on the memory precedes.
• The memory leak will be caused, when accessing to the Write Filter enabled CF card.
To solve the memory leak caused by the Write filter, refer to the following below.
)"6 Solve the memory leak caused by the Write filter" (Page 1-12)
• Turning off the power when writing into a CF card may result in damaged or lost data. The Write
Filter must be enabled.
Application
Write Filter
Enable
CF card
Memory
Write
Write
Read
Read
Read
Application
CF card
Memory
WriteRead
WriteRead
Write Filter
Disable