Actel Fusion Mixed-Signal FPGAs
Erase Page Operation
The Erase Page operation is initiated when the ERASEPAGE pin is asserted. The Erase Page
operation allows the user to erase (set user data to zero) any page within the FB.
The use of the OVERWRITEPAGE and PAGELOSSPROTECT pins is the same for erase as for a Program
Page operation.
As with the Program Page operation, a STATUS of '01' indicates that the addressed page is not
erased.
A waveform for an Erase Page operation is shown in Figure 2-36.
Erase errors include the following:
1. Attempting to erase a page that is Overwrite Protected (STATUS = '01')
2. Attempting to erase a page that is not in the Page Buffer when the Page Buffer has entered
Page Loss Protection mode (STATUS = '01')
3. The Write Count of the erased page exceeding the Write Threshold defined in the part
specification (STATUS = '11')
4. The ECC Logic determining that there is an uncorrectable error within the erased page
(STATUS = '10')
CLK
ERASE
Page
ADDR[17:0]
OVERWRITEPROTECT
PAGELOSSPROTECT
BUSY
STATUS[1:0]
Valid
Figure 2-36 • FB Erase Page Waveform
Preliminary v1.7
2-49
ACTEL [ Actel Corporation ]
