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P1AFS1500-FG256 Datasheet(PDF) 69 Page - Microsemi Corporation

Part No. P1AFS1500-FG256
Description  Fusion Family of Mixed Signal FPGAs
Download  334 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

P1AFS1500-FG256 Datasheet(HTML) 69 Page - Microsemi Corporation

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Fusion Family of Mixed Signal FPGAs
Revision 4
2-53
Unprotect Page Operation
An Unprotect Page operation will clear the protection for a page addressed on the ADDR input. It is
initiated by setting the UNPROTECTPAGE signal on the interface along with the page address on
ADDR.
If the page is not in the Page Buffer, the Unprotect Page operation will copy the page into the Page
Buffer. The Copy Page operation occurs only if the current page in the Page Buffer is not Page Loss
Protected.
The waveform for an Unprotect Page operation is shown in Figure 2-42.
The Unprotect Page operation can incur the following error conditions:
1. If the copy of the page to the Page Buffer determines that the page has a single-bit correctable
error in the data, it will report a STATUS = '01'.
2. If the address on ADDR does not match the address of the Page Buffer, PAGELOSSPROTECT is
asserted, and the Page Buffer has been modified, then STATUS = '11' and the addressed page is
not loaded into the Page Buffer.
3. If the copy of the page to the Page Buffer determines that at least one block in the page has a
double-bit uncorrectable error, STATUS = '10' and the Page Buffer will contain the corrupted data.
Discard Page Operation
If the contents of the modified Page Buffer have to be discarded, the DISCARDPAGE signal should be
asserted. This command results in the Page Buffer being marked as unmodified.
The timing for the operation is shown in Figure 2-43. The BUSY signal will remain asserted until the
operation has completed.
Figure 2-42 • FB Unprotected Page Waveform
CLK
UNPROTECTPAGE
ADDR[17:0]
BUSY
STATUS[1:0]
Page
Valid
Figure 2-43 • FB Discard Page Waveform
CLK
DISCARDPAGE
BUSY


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