XC3S400AN-4FTG256I Xilinx Inc, XC3S400AN-4FTG256I Datasheet - Page 85

• 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

Security Register Read
Table 9-3: Security Register Read Command Sequence
Spartan-3AN FPGA In-System Flash User Guide
UG333 (v2.1) January 15, 2009
Notes:
1. The Security Register Read command is supported in simulation.
MOSI
MISO
Pin
Byte 1
0x77
Four-byte Command Sequence
R
Byte 2
XX
To read the
using the SPI_ACCESS design primitive.
•
•
•
•
High
Drive CSB Low while CLK is High or on the rising edge of CLK.
On the falling edge of CLK, serially clock in the four-byte Security Register Read
command sequence shown in
byte first. The last 3 bytes are dummy bytes.
After clocking in the last bit of the command sequence, receive the Security Register
data on the MISO pin
♦
♦
♦
After clocking in the last data bit to program the register, drive the CSB pin High on
the falling edge of CLK.
Byte 3
XX
Receive each byte location serially, most-significant bit first.
The FPGA application can read less than the complete 128 bytes. For example, the
application can stop after reading first few bytes of the User-Defined Field.
Any data beyond the end of the 128-byte Security Register is undefined.
Security
Byte 4
XX
Register, the FPGA application must perform the following actions
Byte 5
Data 0
www.xilinx.com
XX
User-Defined Field
Byte 6
Data 1
Table 9-3
XX
... Byte 68 Byte 69 Byte 70 ... Byte 132
...
...
on the MOSI pin, most-significant bit of each
Data 63
Security Register
XX
Data 64
XX
Unique Identifier
Security Register Read
Data 65
XX
...
...
Data 127
XX
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