XC3S400AN-4FTG256I Xilinx Inc, XC3S400AN-4FTG256I Datasheet - Page 49

• Manufacturer Part Number: XC3S400AN-4FTG256I
• Description: IC FPGA SPARTAN-3AN 256FTBGA
• Manufacturer: Xilinx Inc
• Series: Spartan™-3ANr

Specifications of XC3S400AN-4FTG256I

• Number Of Logic Elements/cells: 8064
• Number Of Labs/clbs: 896
• Total Ram Bits: 368640
• Number Of I /o: 195
• Number Of Gates: 400000
• Voltage - Supply: 1.14 V ~ 1.26 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 256-LBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Auto Page Rewrite
Spartan-3AN FPGA In-System Flash User Guide
UG333 (v2.1) January 15, 2009
R
This command is only needed if multiple bytes within a page or multiple pages of data are
modified in a random fashion within a sector. This command combines two other
operations, a
Built-in Erase
1.
2.
To issue an Auto Page Rewrite command, the FPGA application must perform the
following actions.
•
•
A page of data is first copied from the addressed ISF memory page to either Buffer 1 or
Buffer 2.
Then, the same data from Buffer 1 or Buffer 2 is programmed back to the same ISF
memory page.
Drive CSB Low while CLK is High or on the rising edge of CLK.
On the falling edge of CLK, serially clock in the appropriate Auto Page Rewrite
command code, shown in
Auto Page Rewrite (Buffer 2)
Auto Page Rewrite (Buffer 1)
MOSI
MISO
CSB
CLK
Page to Buffer Transfer
command, as shown in
SPI_ACCESS
available on
Buffer 2 not
XC3S50AN
Figure 4-5: Auto Page Rewrite Command
www.xilinx.com
Table
4-2, most-significant bit first.
command followed by a
(0x59)
Figure
(0x58)
1
Updates/rewrites selected page.
4-5.
Status Register
READY/BUSY (bit 7)
7
0 = Rewrite in progress
1 = Rewrite complete
Flash Memory Array
6
2
T
PEP
5
Buffer to Page Program with
Page address
= 35 to 40 ms
4
3
2
Auto Page Rewrite
UG333_c4_05_082307
1
0
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