lfxp20c-5f388c Lattice Semiconductor Corp., lfxp20c-5f388c Datasheet - Page 22
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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)
- Current page: 22 of 130
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Lattice Semiconductor
Figure 2-23. Output Register Block
Figure 2-24. ODDRXB Primitive
Tristate Register Block
The tristate register block provides the ability to register tri-state control signals from the core of the device before
they are passed to the sysIO buffers. The block contains a register for SDR operation and an additional latch for
DDR operation. Figure 2-25 shows the diagram of the Tristate Register Block.
In SDR mode, ONEG1 feeds one of the flip-flops that then feeds the output. The flip-flop can be configured a D-
type or latch. In DDR mode, ONEG1 is fed into one register on the positive edge of the clock and OPOS1 is
latched. A multiplexer running off the same clock selects the correct register for feeding to the output (D0).
Routing
From
ONEG0
OPOS0
CLK1
*Latch is transparent when input is low.
CLK
LSR
DA
DB
/LATCH
D
D
D-Type
LATCH
LE*
ODDRXB
2-19
Q
Q
Q
0
1
Programmed
Control
LatticeXP Family Data Sheet
OUTDDN
0
1
To sysIO
Buffer
DO
Architecture
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