LFXP6E-4Q208C Lattice, LFXP6E-4Q208C Datasheet - Page 149
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
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LatticeECP/EC and LatticeXP
Lattice Semiconductor
sysIO Usage Guide
R
= (V
- V
)/I
= (5.25V - 3.75V)/27.4 = 54.8 ohm
EXT
EXT
INMAX
D
If the V
of the bank is increased, it will also increase the value of the external resistor required. Changing the
CCIO
bank V
will also change the value of the input threshold voltage.
CCIO
Programmable Input Delay
Each input can optionally be delayed before it is passed to the core logic or input registers. The primary use for the
input delay is to achieve zero hold time for the input registers when using a direct drive primary clock. To arrive at
zero hold time, the input delay will delay the data by at least as much as the primary clock injection delay. This
option can be turned ON or OFF for each I/O independently in the software using the FIXEDDELAY attribute. This
attribute is described in more detail in the Software sysIO Attributes section. Appendix A shows how this feature
can be enabled in the software using HDL attributes.
Software sysIO Attributes
sysIO attributes can be specified in the HDL, using the Preference Editor GUI or in the ASCII Preference file (.prf)
file directly. Appendices A, B and C list examples of how these can be assigned using each of the methods men-
tioned above. This section describes in detail each of these attributes.
IO_TYPE
This is used to set the sysIO standard for an I/O. The V
required to set these I/O standards are embedded in
CCIO
the attribute names itself. There is no separate attribute to set the V
requirements. Table 8-6 lists the available
CCIO
I/O types.
8-9
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