LFXP2-8E-7FT256C Lattice, LFXP2-8E-7FT256C Datasheet - Page 222
LFXP2-8E-7FT256C
Manufacturer Part Number
LFXP2-8E-7FT256C
Description
FPGA - Field Programmable Gate Array 8K LUTs 201I/O Inst- on DSP 1.2V -7 Spd
Manufacturer
Lattice
Datasheet
1.LFXP2-8E-5FTN256I.pdf
(341 pages)
Specifications of LFXP2-8E-7FT256C
Number Of Macrocells
8000
Number Of Programmable I/os
201
Data Ram Size
226304
Supply Voltage (max)
1.26 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Supply Voltage (min)
1.14 V
Package / Case
FTBGA-256
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LFXP2-8E-7FT256C
Manufacturer:
Lattice Semiconductor Corporation
Quantity:
10 000
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Figure 11-22. Read Data Transfer When Using IDDRMFX1A
Notes:
1. DDR memory sends DQ aligned to DQS Strobe.
2. The DQS Strobe is delayed by 90 degrees 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 generate the DDRCLKPOL signal.
5. The first set of I/O registers, A and B, capture data on the positive and negative edges of DQS.
6. I/O register C transfers data so that both data are now aligned to the negative edge of DQS.
7. DDCLKPOL signal generated will determine if the FPGA clock going into the synchronization registers need to be inverted. The DDRCLK-
8. Registers D and E capture data at the FPGA clock.
9. The data is then again registers at the FPGA clock to ensure a Full Clock Cycle transfer.
10.DATAVALID signal goes HIGH when valid data enters the FPGA core. Once DATA VALID is asserted, it stays high until the next READ pulse.
POL=0 when the FPGA CLK is LOW at the first rising edge of PRMBDET. So the clock to the synchronization registers is not inverted. The
DDRCLKPOL=1 when the FPGA CLK is HIGH at the first rising edge of PRMBDET. In this case the clock to the synchronization register is
inverted.
DDRCLKPOL= 0
DDRCLKPOL=1
IO REGISTERS
IO REGISTERS
CLK TO SYNC
CLK TO SYNC
DATAVALID
DQS at PIN
DQS at IOL
FPGA CLK
FPGA CLK
PRMBDET
DQ at PIN
DQ at IOL
(Case 1)
(Case 2)
QA
QB
QA
QB
A
B
C
D
E
D
E
P0
P0
N0
P0
N0
11-18
P1
P1
P0
N0
N1
P1
N1
P0
P0
N0
N0
LatticeXP2 High-Speed I/O Interface
P2
P2
N1
P1
N2
N2
P2
P1
P0
N0
N1
P1
N1
P0
N0
N2
P2
N2
P0
N2
P2
N1
P2
P1
N1
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