LFXP15 Lattice Semiconductor, LFXP15 Datasheet - Page 14

• Manufacturer Part Number: LFXP15
• Description: LatticeXP Family
• Manufacturer: Lattice Semiconductor

Lattice Semiconductor
For more information on the PLL, please see details of additional technical documentation at the end of this data
sheet.
Dynamic Clock Select (DCS)
The DCS is a global clock buffer with smart multiplexer functions. It takes two independent input clock sources and
outputs a clock signal without any glitches or runt pulses. This is achieved irrespective of where the select signal is
toggled. There are eight DCS blocks per device, located in pairs at the center of each side. Figure 2-12 illustrates
the DCS Block Macro.
Figure 2-12. DCS Block Primitive
Figure 2-13 shows timing waveforms of the default DCS operating mode. The DCS block can be programmed to
other modes. For more information on the DCS, please see details of additional technical documentation at the end
of this data sheet.
Figure 2-13. DCS Waveforms
sysMEM Memory
The LatticeXP family of devices contain a number of sysMEM Embedded Block RAM (EBR). The EBR consists of a
9-Kbit RAM, with dedicated input and output registers.
sysMEM Memory Block
The sysMEM block can implement single port, dual port or pseudo dual port memories. Each block can be used in
a variety of depths and widths as shown in Table 2-6.
SEL
CLK0
DCSOUT
CLK1
CLK0
CLK1
SEL
DCS
2-11
DCSOUT
LatticeXP Family Data Sheet
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Architecture