LFXP6E-4Q208C Lattice, LFXP6E-4Q208C Datasheet - Page 361
LFXP6E-4Q208C
Manufacturer Part Number
LFXP6E-4Q208C
Description
IC FPGA 5.8KLUTS 142I/O 208-PQFP
Manufacturer
Lattice
Datasheet
1.LFXP3C-3T100C.pdf
(397 pages)
Specifications of LFXP6E-4Q208C
Lead Free Status / Rohs Status
Contains lead / RoHS non-compliant
Available stocks
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Part Number:
LFXP6E-4Q208C
Manufacturer:
Lattice Semiconductor Corporation
Quantity:
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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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