XC3S400AN-4FTG256I Xilinx Inc, XC3S400AN-4FTG256I Datasheet - Page 73

• 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

Sector-Based Program/Erase Protection
Table 8-1: Sector Protect and Sector Lockdown Affect Memory Sector Program/Erase Functionality
Spartan-3AN FPGA In-System Flash User Guide
UG333 (v2.1) January 15, 2009
Notes:
1. Issue the
2. The sector protection setting is defined by the
3. To lock a specific sector, issue the
Enable/Disable
Global Control
Sector Protect
Sector Protection Disable
must first issue the
DISABLE
Status
ENABLE
Sector Protect Feature
N/A
N/A
Sector Protection Enable
(1)
R
Sector Protect
PROTECTED
PROTECTED
Sector Protection Register Erase
Status
OPEN
Sector-Specific Control
The Spartan
protect stored data against accidental or intentional changes.
•
•
Table 8-1
interact together.
N/A
command to unprotect all sectors.
The
individual ISF memory sectors.
The
essentially converting the Flash memory into read-only ROM. Once a sector is locked
down, it cannot be erased or modified.
(2)
Sector Lockdown Program
command to enable the protection settings defined in the
Sector Protection
Sector Lockdown
describes how these features affect a specific memory sector and how the features
Sector Lockdown
®
-3AN FPGA In-System Flash (ISF) memory supports various mechanisms to
Lockdown
LOCKED
Status
Sector
OPEN
OPEN
OPEN
Sector Protection
(3)
command followed by a
www.xilinx.com
feature provides the ability to selectively write-protect
feature permanently locks a selected ISF memory sector,
Functionality
command.
◆
◆
◆
◆
◆
◆
Register. To program a new value, the FPGA application
◆
◆
All operations are possible. The FPGA
application can read, program, and erase all
locations in the sector.
Temporarily Read-Only. The FPGA application
can only read locations in the sector. In order to
program or erase the sector, the application
must either issue the
command or issue the
Erase
Register Program
protection control byte is changed to OPEN.
Permanently Read-Only. The sector can never
again be programmed or erased.
Sector Protection Register Program
command followed by a
Sector Protection
Description
command where the sector
Sector Protection Disable
Sector Protection Register
Chapter 8
Register. Issue the
Sector Protection
command.
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