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Spartan-3A DSP FPGA Family: DC and Switching Characteristics
DS610 (v3.0) October 4, 2010
www.xilinx.com
Product Specification
10
Power Supply Specifications
Table 4:
Supply Voltage Thresholds for Power-On Reset
Symbol
Description
Min
Max
Units
V
CCINTT
Threshold for the V
CCINT
supply
0.4
1.0
V
V
CCAUXT
Threshold for the V
CCAUX
supply
1.0
2.0
V
V
CCO2T
Threshold for the V
CCO
Bank 2 supply
1.0
2.0
V
Notes:
1.
V
CCINT
, V
CCAUX
, and V
CCO
supplies to the FPGA can be applied in any order. However, the FPGA configuration source (Platform Flash, SPI
Flash, parallel NOR Flash, microcontroller) might have specific requirements. Check the data sheet for the attached configuration source.
Apply V
CCINT
last for lowest overall power consumption (see the
UG331
chapter titled "Powering Spartan-3 Generation FPGAs" for more
information).
2.
To ensure successful power-on, V
CCINT
, V
CCO
Bank 2, and V
CCAUX
supplies must rise through their respective threshold-voltage ranges with
no dips at any point.
Table 5:
Supply Voltage Ramp Rate
Symbol
Description
Min
Max
Units
V
CCINTR
Ramp rate from GND to valid V
CCINT
supply level
0.2
100
ms
V
CCAUXR
Ramp rate from GND to valid V
CCAUX
supply level
0.2
100
ms
V
CCO2R
Ramp rate from GND to valid V
CCO
Bank 2 supply level
0.2
100
ms
Notes:
1.
V
CCINT
, V
CCAUX
, and V
CCO
supplies to the FPGA can be applied in any order. However, the FPGA configuration source (Platform Flash, SPI
Flash, parallel NOR Flash, microcontroller) might have specific requirements. Check the data sheet for the attached configuration source.
Apply V
CCINT
last for lowest overall power consumption (see the
UG331
chapter titled "Powering Spartan-3 Generation FPGAs" for more
information).
2.
To ensure successful power-on, V
CCINT
, V
CCO
Bank 2, and V
CCAUX
supplies must rise through their respective threshold-voltage ranges with
no dips at any point.
Table 6:
Supply Voltage Levels Necessary for Preserving CMOS Configuration Latch (CCL) Contents and RAM Data
Symbol
Description
Min
Units
V
DRINT
V
CCINT
level required to retain CMOS Configuration Latch (CCL) and RAM data
1.0
V
V
DRAUX
V
CCAUX
level required to retain CMOS Configuration Latch (CCL) and RAM data
2.0
V