LFE2-6E-7T144C Lattice, LFE2-6E-7T144C Datasheet - Page 7

• Manufacturer Part Number: LFE2-6E-7T144C
• Description: FPGA - Field Programmable Gate Array 6K LUTs 90 I/O DSP 1.2V -7
• Manufacturer: Lattice

Specifications of LFE2-6E-7T144C

• Number Of I/os: 90
• Maximum Operating Frequency: 420 MHz
• Operating Supply Voltage: 1.2 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-144
• Minimum Operating Temperature: 0 C
• Factory Pack Quantity: 300

Lattice Semiconductor
Table 2-2. Slice Signal Descriptions
Modes of Operation
Each slice has up to four potential modes of operation: Logic, Ripple, RAM and ROM.
Logic Mode
In this mode, the LUTs in each slice are configured as 4-input combinatorial lookup tables. A LUT4 can have 16
possible input combinations. Any four input logic functions can be generated by programming this lookup table.
Since there are two LUT4s per slice, a LUT5 can be constructed within one slice. Larger look-up tables such as
LUT6, LUT7 and LUT8 can be constructed by concatenating other slices. Note LUT8 requires more than four
slices.
Ripple Mode
Ripple mode allows the efficient implementation of small arithmetic functions. In ripple mode, the following func-
tions can be implemented by each slice:
• Addition 2-bit
• Subtraction 2-bit
• Add/Subtract 2-bit using dynamic control
• Up counter 2-bit
• Down counter 2-bit
• Up/Down counter with Async clear
• Up/Down counter with preload (sync)
• Ripple mode multiplier building block
• Multiplier support
• Comparator functions of A and B inputs
– A greater-than-or-equal-to B
1. See Figure 2-3 for connection details.
2. Requires two PFUs.
Function
Output
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Inter-PFU signal
Inter-slice signal
Inter-slice signal
Inter-PFU signal
Multi-purpose
Multi-purpose
Control signal
Control signal
Control signal
Data signals
Data signals
Data signals
Data signals
Data signal
Data signal
Type
A0, B0, C0, D0
A1, B1, C1, D1
Signal Names
Q0, Q1
F0, F1
OFX0
OFX1
FCIN
FCO
LSR
CLK
FXA
FXB
M0
M1
CE
Inputs to LUT4
Inputs to LUT4
Multipurpose Input
Multipurpose Input
Clock Enable
Local Set/Reset
System Clock
Fast Carry-in
Intermediate signal to generate LUT6 and LUT7
Intermediate signal to generate LUT6 and LUT7
LUT4 output register bypass signals
Register outputs
Output of a LUT5 MUX
Output of a LUT6, LUT7, LUT8
Slice 2 of each PFU is the fast carry chain output
2-4
1
LatticeECP2 Family Data Sheet
Description
2
MUX depending on the slice
1
Architecture