LFXP3C-3TN144I Lattice, LFXP3C-3TN144I Datasheet - Page 231
LFXP3C-3TN144I
Manufacturer Part Number
LFXP3C-3TN144I
Description
FPGA - Field Programmable Gate Array 3.1K LUTs 100 I/O 1.8/2.5/3.3V IND
Manufacturer
Lattice
Specifications of LFXP3C-3TN144I
Number Of Programmable I/os
100
Data Ram Size
55296
Supply Voltage (max)
3.465 V
Maximum Operating Temperature
+ 100 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Supply Voltage (min)
1.71 V
Package / Case
TQFP-144
Package
144TQFP
Family Name
LatticeXP
Device Logic Units
3000
Maximum Internal Frequency
320 MHz
Typical Operating Supply Voltage
1.8|2.5|3.3 V
Maximum Number Of User I/os
100
Ram Bits
55296
Re-programmability Support
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Figure 10-13. Read Data Transfer When DDRCLKPOL=1
Data Read Critical Path
Data in the second stage DDR registers can be registered either on the positive edge or on the falling edge of
FPGA clock depending on the DDRCLKPOL signal. In order to ensure that the data transferred to the FPGA core
registers is aligned to the rising edge of system CLK, this path should be constrained with a half clock transfer. This
half clock transfer can be forced in the software by assigning a multicycle constraint (multicycle of 0.5 X) on all the
data paths to the first PFU register.
Notes -
(1) DDR memory sends DQ aligned to DQS strobe.
(2) The DQS Strobe is delayed by 90 degree using the dedicated DQS logic.
(3) DQ is now center aligned to DQS Strobe.
(4) PRMBDET is the Preamble detect signal generated using the DQSBUFB primitive. This is used to
(5) The first set of IO registers A and B, capture data on the positive edge and negative edge of DQS.
(6) IO register C transfers data so that both data are now aligned to negative edge of DQS.
(7) DDCLKPOL signal generated will determine if the CLK going into the synchronization registers need to
(8) The IO Synchronization registers capture data at on negative edge of the FPGA CLK.
DDRCLKPOL=1
IO REGISTERS
CLK TO SYNC
generate the DDRCLKPOL signal.
be inverted. In this case, the DDRCLKPOL=1 as the CLK is HIGH at the 1
DQS at PIN
DQS at IOL
PRMBDET
FPGA CLK
DATAIN_P
DATAIN_N
DQ at PIN
DQ at IOL
C
A
B
P0
P0
10-12
N0
N0
P0
P1
P1
N0
P0
N1
P1
N1
P0
N0
st
LatticeECP/EC and LatticeXP
N1
P1
rising edge of PRMBDET.
DDR Usage Guide
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