![]() ![]() Signal tmp: std_logic_vector(7 downto 0) įollowing is the Verilog code for an 8-bit shift-left register with a positive-edge clock, serial in, and serial out.Įndmodule 8-bit Shift-Left Register with Negative-Edge Clock, Clock Enable, Serial In, and Serial Out The following figure shows the pin layout of SRL16E.įollowing is the VHDL code for an 8-bit shift-left register with a positive-edge clock, serial in, and serial out. Both are available with or without a clock enable. Ĭonsult the VHDL/Verilog language reference manuals for more information.īefore writing Shift Register behavior it is important to recall that Virtex, Virtex-E, Virtex-II, and Virtex-II Pro have specific hardware resources to implement Shift Registers: SRL16 for Virtex and Virtex-E, and SRLC16 for Virtex-II and Virtex-II Pro. ![]() predefined shift operators for example, sll, srl.There are different ways to describe shift registers. ![]()
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