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alfoltran |
/////////////////////////////////////////////////////////////////////
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//// ////
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//// USB FIFO ////
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//// ////
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//// SystemC Version: usb_fifo512x8.cpp ////
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//// Author: Alfredo Luiz Foltran Fialho ////
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//// alfoltran@ig.com.br ////
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//// ////
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//// ////
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/////////////////////////////////////////////////////////////////////
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//// ////
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//// Verilog Version: generic_fifo_sc_a.v ////
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//// Copyright (C) 2000-2002 Rudolf Usselmann ////
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//// www.asics.ws ////
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//// rudi@asics.ws ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer.////
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//// ////
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//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
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//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////
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//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////
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//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////
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//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////
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//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////
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//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////
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//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////
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//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////
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//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////
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//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////
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//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////
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//// POSSIBILITY OF SUCH DAMAGE. ////
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//// ////
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/////////////////////////////////////////////////////////////////////
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#include "systemc.h"
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#include "usb_fifo512x8.h"
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void usb_fifo512x8::write_pointer_update(void) {
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if (!rst.read()) {
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wp.write(0);
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} else if (clr.read()) {
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wp.write(0);
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} else if (we.read()) {
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wp.write(wp_pl1.read());
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}
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}
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void usb_fifo512x8::read_pointer_update(void) {
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if (!rst.read()) {
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rp.write(0);
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} else if (clr.read()) {
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rp.write(0);
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} else if (re.read()) {
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rp.write(rp_pl1.read());
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}
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}
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void usb_fifo512x8::future_pointers_update(void) {
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wp_pl1.write(wp.read() + 1);
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wp_pl2.write(wp.read() + 2);
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rp_pl1.write(rp.read() + 1);
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}
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// Full & Empty Logic
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// Guard Bit ...
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void usb_fifo512x8::fe_gb_update(void) {
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if (!rst.read())
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gb.write(false);
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else if (clr.read())
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gb.write(false);
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else if ((wp_pl2.read() == rp.read()) && we.read())
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gb.write(true);
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else if ((wp.read() != rp.read()) && re.read())
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gb.write(false);
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}
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void usb_fifo512x8::fe_full_update(void) {
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if (!rst.read())
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full.write(false);
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else if (clr.read())
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full.write(false);
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else if (we.read() && ((wp_pl1.read() == rp.read()) && gb.read()) && !re.read())
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full.write(true);
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else if (re.read() && ((wp_pl1.read() != rp.read()) || !gb.read()) && !we.read())
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full.write(false);
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}
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void usb_fifo512x8::fe_empty_update(void) {
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if (!rst.read())
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empty.write(true);
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else if (clr.read())
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empty.write(true);
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else if (we.read() && ((wp.read() != rp_pl1.read()) || gb.read()) && !re.read())
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empty.write(false);
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else if (re.read() && ((wp.read() == rp_pl1.read()) && !gb.read()) && !we.read())
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empty.write(true);
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}
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void usb_fifo512x8::reset_update(void) {
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n_rst.write(!rst.read());
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}
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/*
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usb_fifo512x8::~usb_fifo512x8(void) {
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if (i_ram)
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delete i_ram;
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}
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*/
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