LFXP6C-4TN144C Lattice, LFXP6C-4TN144C Datasheet - Page 278

• Manufacturer Part Number: LFXP6C-4TN144C
• Description: IC FPGA 5.8KLUTS 100I/O 144-TQFP
• Manufacturer: Lattice

Specifications of LFXP6C-4TN144C

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2007 Lattice Semiconductor Corp. All Lattice trademarks, registered trademarks, patents, and disclaimers are as listed at www.latticesemi.com/legal. All other
brand or product names are trademarks or registered trademarks of their respective holders. The specifications and information herein are subject to change without
notice.
September 2007
Introduction
One of the requirements when using FPGA devices is the ability to calculate power dissipation for a particular
device used on a board. Lattice’s ispLEVER
to calculate the power dissipation for a given device. This technical note explains how to use Power Calculator to
calculate the power consumption of Lattice devices. General guidelines to reduce power consumption are also
included.
Power Supply Sequencing and Hot Socketing
LatticeECP™, LatticeEC™ and LatticeXP devices have eight sysIO™ buffer banks in addition to the V
and V
supply voltage (V
pletely independent from each other.
The LatticeECP/EC and LatticeXP devices are designed to ensure predictable behavior during power-up and
power-down. Power supplies can be sequenced in any order. The I/Os remain in tristate until the power supply volt-
age is high enough to ensure reliable operation during power up and power-down sequences and the leakage into
I/O pins is controlled to within specified limits. Refer to the Typical I/O Behavior During Power-up and Hot Socketing
sections of the device data sheet for more details.
Power Calculator Hardware Assumptions
The power consumption for a device can be coarsely broken down into the DC portion and the AC portion.
The power calculator reports the power dissipation in terms of:
The DC power (or the static power consumption) is the total power consumption of the used and unused resources.
These components are fixed for each resource used and depend upon the number of resource units utilized. The
DC component also includes the static power dissipation for the unused resources of the device.
The AC portion of power consumption is associated with the used resources and it is the dynamic part of the power
consumption. Its power dissipation is directly proportional to the frequency at which the resource is running and the
number of resource units used.
Power Calculator
Power Calculator is a powerful tool which allows users to make an estimate of the power consumption at two differ-
ent levels:
For first level estimation, the user provides estimates of device usage in the Power Calculator Wizard and the tool
provides a rough estimate of the power consumption.
The second level is a more accurate approach where the user imports the actual device utilization by importing the
post Place and Route netlist (NCD) file.
www.latticesemi.com
1. DC portion of the power consumption.
2. AC portion of the power consumption.
1. Estimate of the utilized resources before completing place and route
2. Post place and route design
CCJ
power supplies; each is capable of supporting multiple I/O standards. Each sysIO bank has its own I/O
CCIO
), and two voltage references V
Power Estimation and Management for
LatticeECP/EC and LatticeXP Devices
®
design tools include a Power Calculator tool which allows designers
REF1
12-1
and V
REF2
resources allowing each bank to be com-
Technical Note TN1052
CC,
tn1052_02.3
V
CCAUX