lfxp20c-5f388c Lattice Semiconductor Corp., lfxp20c-5f388c Datasheet - Page 21
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lfxp20c-5f388c
Manufacturer Part Number
lfxp20c-5f388c
Description
Latticexp Fpga Data Sheets
Manufacturer
Lattice Semiconductor Corp.
Datasheet
1.LFXP20C-5F388C.pdf
(130 pages)
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Part Number:
LFXP20C-5F388C
Manufacturer:
Lattice Semiconductor Corporation
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Figure 2-21. Input Register DDR Waveforms
Figure 2-22. INDDRXB Primitive
Output Register Block
The output register block provides the ability to register signals from the core of the device before they are passed
to the sysIO buffers. The block contains a register for SDR operation that is combined with an additional latch for
DDR operation. Figure 2-23 shows the diagram of the Output Register Block.
In SDR mode, ONEG0 feeds one of the flip-flops that then feeds the output. The flip-flop can be configured as a D-
type or as a latch. In DDR mode, ONEG0 is fed into one register on the positive edge of the clock and OPOS0 is
latched. A multiplexer running off the same clock selects the correct register for feeding to the output (D0).
Figure 2-24 shows the design tool DDR primitives. The SDR output register has reset and clock enable available.
The additional register for DDR operation does not have reset or clock enable available.
(In DDR Mode)
Delayed
DQS
DQS
D0
D2
DI
DDRCLKPOL
A
ECLK
SCLK
LSR
CE
D
B
2-18
IDDRXB
C
B
A
QA
QB
D
LatticeXP Family Data Sheet
E
D
C
F
Architecture
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