大家帮忙看看这个宏函数是做什么的？？
// megafunction wizard: %Shift register (RAM-based)%// GENERATION: STANDARD
// VERSION: WM1.0
// MODULE: altshift_taps
// ============================================================
// File Name: Line_Buffer.v
// Megafunction Name(s):
// altshift_taps
// ============================================================
// ************************************************************
// THIS IS A WIZARD-GENERATED FILE. DO NOT EDIT THIS FILE!
//
// 6.0 Build 202 06/20/2006 SP 1 SJ Full Version
// ************************************************************
//Copyright (C) 1991-2006 Altera Corporation
//Your use of Altera Corporation's design tools, logic functions
//and other software and tools, and its AMPP partner logic
//functions, and any output files any of the foregoing
//(including device programming or simulation files), and any
//associated documentation or information are expressly subject
//to the terms and conditions of the Altera Program License
//Subscription Agreement, Altera MegaCore Function License
//Agreement, or other applicable license agreement, including,
//without limitation, that your use is for the sole purpose of
//programming logic devices manufactured by Altera and sold by
//Altera or its authorized distributors.Please refer to the
//applicable agreement for further details.
// synopsys translate_off
`timescale 1 ps / 1 ps
// synopsys translate_on
module Line_Buffer (
clken,
clock,
shiftin,
shiftout,
taps);
input clken;
input clock;
input shiftin;
output shiftout;
output taps;
wire sub_wire0;
wire sub_wire1;
wire taps = sub_wire0;
wire shiftout = sub_wire1;
altshift_taps altshift_taps_component (
.clken (clken),
.clock (clock),
.shiftin (shiftin),
.taps (sub_wire0),
.shiftout (sub_wire1));
defparam
altshift_taps_component.lpm_type = "altshift_taps",
altshift_taps_component.number_of_taps = 1,
altshift_taps_component.tap_distance = 640,
altshift_taps_component.width = 16;
endmodule
// ============================================================
// CNX file retrieval info
// ============================================================
// Retrieval info: PRIVATE: CLKEN NUMERIC "1"
// Retrieval info: PRIVATE: GROUP_TAPS NUMERIC "0"
// Retrieval info: PRIVATE: INTENDED_DEVICE_FAMILY STRING "Cyclone II"
// Retrieval info: PRIVATE: NUMBER_OF_TAPS NUMERIC "1"
// Retrieval info: PRIVATE: RAM_BLOCK_TYPE NUMERIC "0"
// Retrieval info: PRIVATE: TAP_DISTANCE NUMERIC "640"
// Retrieval info: PRIVATE: WIDTH NUMERIC "16"
// Retrieval info: CONSTANT: LPM_TYPE STRING "altshift_taps"
// Retrieval info: CONSTANT: NUMBER_OF_TAPS NUMERIC "1"
// Retrieval info: CONSTANT: TAP_DISTANCE NUMERIC "640"
// Retrieval info: CONSTANT: WIDTH NUMERIC "16"
// Retrieval info: USED_PORT: clken 0 0 0 0 INPUT VCC clken
// Retrieval info: USED_PORT: clock 0 0 0 0 INPUT NODEFVAL clock
// Retrieval info: USED_PORT: shiftin 0 0 16 0 INPUT NODEFVAL shiftin
// Retrieval info: USED_PORT: shiftout 0 0 16 0 OUTPUT NODEFVAL shiftout
// Retrieval info: USED_PORT: taps 0 0 16 0 OUTPUT NODEFVAL taps
// Retrieval info: CONNECT: @shiftin 0 0 16 0 shiftin 0 0 16 0
// Retrieval info: CONNECT: shiftout 0 0 16 0 @shiftout 0 0 16 0
// Retrieval info: CONNECT: taps 0 0 16 0 @taps 0 0 16 0
// Retrieval info: CONNECT: @clock 0 0 0 0 clock 0 0 0 0
// Retrieval info: CONNECT: @clken 0 0 0 0 clken 0 0 0 0
// Retrieval info: LIBRARY: altera_mf altera_mf.altera_mf_components.all
// Retrieval info: GEN_FILE: TYPE_NORMAL Line_Buffer.v TRUE
// Retrieval info: GEN_FILE: TYPE_NORMAL Line_Buffer.inc FALSE
// Retrieval info: GEN_FILE: TYPE_NORMAL Line_Buffer.cmp FALSE
// Retrieval info: GEN_FILE: TYPE_NORMAL Line_Buffer.bsf FALSE
// Retrieval info: GEN_FILE: TYPE_NORMAL Line_Buffer_inst.v FALSE
// Retrieval info: GEN_FILE: TYPE_NORMAL Line_Buffer_bb.v FALSE 用quartus的MageCore工具编辑一下就看得到了 看过了，但是不知道用来做什么用的。
看别人的程序的时候遇到的
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