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alfoltran |
/////////////////////////////////////////////////////////////////////
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//// ////
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//// USB Fast FIFO - 2 Entries Deep ////
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//// ////
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//// SystemC Version: usb_fifo2.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: usb1_fifo2.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_fifo2.h"
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void usb_fifo2::wp_update(void) {
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if (!rst.read())
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wp.write(false);
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else if (clr.read())
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wp.write(false);
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else if (we.read())
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wp.write(!wp.read());
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}
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void usb_fifo2::rp_update(void) {
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if (!rst.read())
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rp.write(false);
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else if (clr.read())
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rp.write(false);
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else if (re.read())
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rp.write(!rp.read());
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}
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void usb_fifo2::write(void) {
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if (we.read())
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mem[wp.read()] = din.read();
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}
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void usb_fifo2::read(void) {
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dout.write(mem[rp.read()]);
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}
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