Chapter 4: Electrical Requirements

R

FPGA Internal Power Budget

Table 4-4summarizes power consumption estimates by each of the three XC5VLX50T-FFG1136 FPGAs on the Virtex-5 FPGA ML561 Development Board. This estimate derives the FPGA utilization information from the respective map report of a fully configured reference design.

Table 4-4:ML561 FPGA Power Estimate Summary

FPGA #

FPGA #1

FPGA #2(1)

FPGA #3

Interface

DDR400 Comp

DDR2 Comp

DDR2 DIMM

QDRII (DCI)

RLDRAM II

(DCI)

(DCI)

(DCI)

(DCI)

 

 

 

 

 

 

 

 

I/O Standard

 

 

SSTL_18

HSTL_18

HSTL_18

 

 

 

 

 

 

Total Power (W)

3.7

3.1

10.2

6.3

4.5

 

 

 

 

 

 

 

 

 

 

 

 

VCCINT (1.0V) mW

763

763

1945

1160

1515

VCCAUX (2.5V) mW

435

544

544

544

544

SSTL_18 VCCO (1.8V) mW

 

1819

7664

 

 

SSTL_2 VCCO (2.6V) mW

2469

 

 

 

 

HSTL_18 VCCO (1.8V) mW

 

 

 

4571

2406

 

 

 

 

 

 

I/O Frequency (MHz)

200

400

400

400

400

 

 

 

 

 

 

Fabric Frequency (MHz)

200

200

200

200

200

 

 

 

 

 

 

 

 

 

 

 

 

Number of Slices

1500

1500

5910

2750

1951

 

 

 

 

 

 

Number of Flip-flops

2000

2000

7352

2000

1800

 

 

 

 

 

 

Number of Shift Register LUTs

50

50

143

750

400

 

 

 

 

 

 

 

 

 

 

 

 

Number of Block RAMs

5

5

17

14

21

 

 

 

 

 

 

Number of DCMs

2

2

2

2

2

 

 

 

 

 

 

 

 

 

 

 

 

Inputs

10

10

10

90

13

 

 

 

 

 

 

Outputs

50

50

90

160

52

 

 

 

 

 

 

Bidirectionals

36

40

192

0

36

 

 

 

 

 

 

 

 

 

 

 

 

Ambient Temperature (°C)

25

25

25

25

25

 

 

 

 

 

 

Airflow (LFM)

0

0

250

250

0

 

 

 

 

 

 

Heat Sink (Theta-J)

n/a

n/a

5

5

n/a

 

 

 

 

 

 

 

 

 

 

 

 

Junction Temperature (°C)

67

60

78

58

76

 

 

 

 

 

 

Notes:

1.For DDR2 DIMMs as well as QDRII memory interfaces with DCI, an MD35E-10B heat sink is needed. A heat sink with Theta-J = 5.0 should be okay without airflow. See http://www.alphanovatech.com/c_md35e.html for the heat sink profile. A heat sink with Theta-J = 5.0 might need airflow of 250 LFM.

46

www.xilinx.com

Virtex-5 FPGA ML561 User Guide

 

 

UG199 (v1.2) April 19, 2008

Page 46
Image 46
Xilinx manual Fpga Internal Power Budget, 4ML561 Fpga Power Estimate Summary, Fpga #21