LFEC3E-3QN208I Lattice, LFEC3E-3QN208I Datasheet - Page 423
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LFEC3E-3QN208I
Manufacturer Part Number
LFEC3E-3QN208I
Description
IC FPGA 3KLUTS 208PQFP
Manufacturer
Lattice
Series
EC3r
Datasheets
1.LFEC3E-5TN144C.pdf
(163 pages)
2.LFE3-35EA-8FN672I.pdf
(21 pages)
3.LFEC3E-3QN208I.pdf
(478 pages)
Specifications of LFEC3E-3QN208I
Number Of Logic Elements/cells
3100
Number Of Labs/clbs
-
Total Ram Bits
56320
Number Of I /o
145
Number Of Gates
-
Voltage - Supply
1.14 V ~ 1.26 V
Mounting Type
Surface Mount
Operating Temperature
-40°C ~ 100°C
Package / Case
208-BFQFP
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
Q6377645
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LFEC3E-3QN208I
Manufacturer:
Lattice Semiconductor Corporation
Quantity:
10 000
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June 2004
Introduction
This document describes how to meet board timing requirements for DDR signals. The Lattice DDR SDRAM Con-
troller IP core, non-pipelined version (DDR-NP) is used as an example.
Figure 18-1 describes the timing diagram for the DDR signals. A total of five clocks are used in the DDR board
design using the Lattice DDR IP core. The following is the clock description:
clk:
ddr_clk:
ddr_clk_n:
pll_mclk (clkx):
pll_nclk (clk2x): A 266MHz clock for DDR NP, used inside the FPGA only.
Figure 18-1. DDR Signal Timing Diagram
www.latticesemi.com
CLK
CLKIN
CLKFB
Input clock for PLL (max. frequency of 133MHz for DDR NP)
Output clock going to DDR (max. frequency of 133MHz for DDR NP)
Negated version of ddr_clk
Same as ddr_clk, used inside the FPGA only.
PLL
CLK2X
CLKX
t
FPGA_CLK
pll_nclk
pll_mclk
t
CDQ
t
DDR_CLK
t
t
CCTRL
CDQS
Board Timing Guidelines for the
DDR SDRAM Controller IP Core
clk2x tree
FPGA
18-1
clkx tree
FPGA
ddr_dq_in
(read flops)
ddr_dq_out
(write flops)
D
D
Q
D
D
Q
Q
Q
D
Q
t
ENB
PD
ddr_dq
ddr_ad &
command signals
ddr_clk
ddr_clk_n
dqs_out
t
BDCTRL
t
BDC
t
t
BDDS
BDD
Technical Note TN1071
MEMORY
DDR
tn1071_01.0
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