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alfoltran |
/////////////////////////////////////////////////////////////////////
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//// ////
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//// USB IDMA Engine ////
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//// ////
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//// SystemC Version: usb_dma.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_idma.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_dma.h"
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void usb_dma::empty_int_up(void) {
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ep_empty_int.write(ep_empty.read());
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}
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void usb_dma::full_int_up(void) {
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ep_full_int.write(ep_full.read());
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}
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void usb_dma::mwe_up1(void) {
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mwe_r.write(rx_data_valid.read());
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}
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void usb_dma::mwe_up2(void) {
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mwe.write(mwe_r.read() && !ep_full_int.read());
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}
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void usb_dma::data_valid_up(void) {
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rx_data_valid_r.write(rx_data_valid.read());
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}
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void usb_dma::data_done_up(void) {
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rx_data_done_r.write(rx_data_done.read());
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}
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void usb_dma::tx_dma_en_up1(void) {
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tx_dma_en_r.write(tx_dma_en.read());
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}
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void usb_dma::tx_dma_en_up2(void) {
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tx_dma_en_r1.write(tx_dma_en_r.read());
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}
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void usb_dma::tx_dma_en_up3(void) {
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tx_dma_en_r2.write(tx_dma_en_r1.read());
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}
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void usb_dma::idma_done_up(void) {
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idma_done.write(rx_data_done_r.read() || sizd_is_zero_d.read() || ep_empty_int.read());
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}
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void usb_dma::rx_cnt_up1(void) {
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if (!rst.read())
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rx_cnt_r.write(0);
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else if (rx_data_done_r.read())
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rx_cnt_r.write(0);
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else if (rx_data_valid.read())
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rx_cnt_r.write(rx_cnt_r.read() + 1);
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}
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void usb_dma::rx_cnt_up2(void) {
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if (!rst.read())
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rx_cnt.write(0);
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else if (rx_data_done_r.read())
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rx_cnt.write(rx_cnt_r.read());
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}
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void usb_dma::rx_done_up(void) {
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rx_done.write(rx_data_done_r.read());
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}
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// Transmit Size Counter (counting backward from input size)
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// For MAX packet size
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void usb_dma::sizd_cnt_up(void) {
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if (!rst.read())
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sizd_c.write(511);
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else if (tx_dma_en.read())
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sizd_c.write(size.read());
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else if (siz_dec.read())
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sizd_c.write(sizd_c.read() - 1);
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}
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void usb_dma::is_zero_up1(void) {
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sizd_is_zero_d.write(sizd_c.read() == 0);
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}
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void usb_dma::is_zero_up2(void) {
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sizd_is_zero.write(sizd_is_zero_d.read());
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}
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void usb_dma::siz_dec_up(void) {
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siz_dec.write((tx_dma_en_r.read() || tx_dma_en_r1.read() || rd_next.read()) && !sizd_is_zero_d.read());
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}
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void usb_dma::tx_busy_up(void) {
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tx_busy.write(send_data.read() || tx_dma_en_r.read() || tx_dma_en.read());
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}
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void usb_dma::tx_valid_up1(void) {
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tx_valid_r.write(tx_valid.read());
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}
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void usb_dma::tx_valid_up2(void) {
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tx_valid_e.write(tx_valid_r.read() && !tx_valid.read());
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}
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// Since we are prefetching two entries in to our fast fifo, we
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// need to know when exactly ep_empty was asserted, as we might
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// only need 1 or 2 bytes. This is for ep_empty_r
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void usb_dma::empty_up(void) {
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if (!rst.read())
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ep_empty_r.write(false);
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else if (!tx_valid.read())
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ep_empty_r.write(false);
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else if (tx_dma_en_r2.read())
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ep_empty_r.write(ep_empty_int.read());
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}
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void usb_dma::send_data_up1(void) {
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if (!rst.read())
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send_data_r.write(false);
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else if (tx_dma_en_r.read() && !ep_empty_int.read())
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send_data_r.write(true);
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else if (rd_next.read() && (sizd_is_zero_d.read() || (ep_empty_int.read() && !sizd_is_zero_d.read())))
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send_data_r.write(false);
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}
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void usb_dma::send_data_up2(void) {
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send_data.write((send_data_r.read() && !ep_empty_r.read() && !(sizd_is_zero.read() &&
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(size.read() == 1))) || tx_dma_en_r1.read());
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}
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void usb_dma::mre_up(void) {
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mre.write((tx_dma_en_r1.read() || tx_dma_en_r.read() || rd_next.read()) &&
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!sizd_is_zero_d.read() && !ep_empty_int.read() &&
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(send_data.read() || tx_dma_en_r1.read() || tx_dma_en_r.read()));
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}
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void usb_dma::ff_we_up1(void) {
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ff_we1.write(mre.read());
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}
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void usb_dma::ff_we_up2(void) {
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ff_we.write(ff_we1.read());
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}
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void usb_dma::ff_re_up(void) {
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ff_re.write(rd_next.read());
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}
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void usb_dma::ff_clr_up(void) {
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ff_clr.write(!tx_valid.read());
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}
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/*
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usb_dma::~usb_dma(void) {
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if (i_ff2)
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delete i_ff2;
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}
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*/
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