Use of parameterized module library (LPM)

Source: Internet
Author: User

LPM (Library Parameterized Modules) is a Parameterized macro function module Library. Using these functional module libraries can greatly improve the efficiency of icdesign. The LPM standard was introduced in 1990. In April 1993, LPM, as a subsidiary standard of the Electronic Design interchange format (EDIF), was incorporated into the temporary standard of the Electronic Industry Association (EIA.

It is very convenient to call the LPM library function in MAX + plus ii and Quartus II. You can either directly call the function in the Graphic Input Method or in the HDL source file.

The LPM library is shown in Table 2-5. It is a function module provided by MAX + plus ii and Quartus II for calling.

The directory where the LPM library of MAX + plus ii is located is/maxplus2/max2lib/mega_lpm. The directory where the LPM library of Quartus II is located is/altera/quartus60/libraries/megas.

Table 2-5 LPM Library Unit list

Module category Macro Unit Brief Description
Door unit module Lpm_and Parameterization and gate
  Lpm_bustri Parameterized three-state Buffer
  Lpm_clshift Parameterized combination logic Positioner
  Lpm_constant Parameterized constant Generator
  Lpm_decode Parameterized Decoder
  Lpm_inv Parameterized Reverser
 

 

Lpm_mux Parameterized multi-path Selector
  Busmux Parameterized bus Selector
  MUX Multi-path Selector
  Lpm_or Parameterization or gate
  Lpm_xor Parameterized exclusive OR gate
Arithmetic Operation Module Lpm_abs Parameterized absolute value calculation
  Lpm_add_sub Parameterized addition/Subtraction
  Lpm_compare Parameterized Comparator
  Lpm_counter Parameterized counter
  Lpm_mult Parameterized Multiplier
Memory Module Lpm_ff Parameterized D Trigger
 

 

Lpm_latch Parameterized latches
  Lpm_ram_dq Input/Output separate parameterized Ram
  Lpm_ram_io Parameterized RAM for input and output multiplexing
  Lpm_rom Parameterized Rom
  Lpm_shitreg Parameterized shift register
  Csfifo Parameterization first-in-first-out queue
  Csdpram Parameterized dual-port RAM
Other functional modules Pll Parameterized Phase-Locked Loop Circuit
  Ntsc < NTSC image control signal generator
      Appendix: Use the LPM Library Unit to construct a four-digit Calculator

The following describes how to use the LPM Library Unit to construct a four-bit calculator.

Lpm_add_sub is a parameterized addition/subtraction operator. It can be used to design the addition or subtraction operator. Compile

Edit the logstore, as shown in Figure 2-7.

Figure 2-7 parameterized addition/subtraction lpm_add_sub

Specify the following parameter values,

LPM_WIDTH = 4 (module signal width is 4 bits)

LPM_DIRECTION = "ADD" (set the module as a calculator)

LPM_REPRESENTATION = "UNSIGNED" (set the input and output data to the UNSIGNED number)

Then you need to set the port. Here, only four ports of the lpm_add_sub Library Unit are used, which are the data input ports.

Data-a [] and data-B [], result [] At the data output end, And cout at the input output end. The simulation results are shown in Figure 2-8.

Figure 2-8lpm_add_sub simulation image when it is set as a multiplier

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