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Message
From: Jose Ignacio Villar<jose@d...>
Date: Wed Apr 30 00:27:48 CEST 2008
Subject: [openrisc] Pb with the jtag_trst pin.
Hi!
you can connect it to an external source as a button of your board.
Here i send you a working instantiation for Spartan 3E starter kit from
Digilent.
from system.ucf:
#
# JTAG signals - on J4 6-pin accessory header.
# Use button "east" as trst.
#
NET "jtag_tms" LOC = "D7" | IOSTANDARD = LVCMOS33 | PULLDOWN ;
NET "jtag_tdi" LOC = "C7" | IOSTANDARD = LVCMOS33 | PULLDOWN ;
NET "jtag_tdo" LOC = "F8" | IOSTANDARD = LVCMOS33 | SLEW = FAST | DRIVE =
8 ;
NET "jtag_tck" LOC = "E8" | IOSTANDARD = LVCMOS33 | PULLDOWN ;
NET "jtag_trst" LOC = "H13" | IOSTANDARD = LVCMOS33 | PULLDOWN ;
from system.v:
dbg_top dbg_top (
// JTAG pins
.tms_pad_i ( jtag_tms ),
.tck_pad_i ( jtag_tck ),
.trst_pad_i ( ~jtag_trst ),
.tdi_pad_i ( jtag_tdi ),
.tdo_pad_o ( jtag_tdo ),
.tdo_padoen_o ( ),
// Boundary Scan signals
.capture_dr_o ( ),
.shift_dr_o ( ),
.update_dr_o ( ),
.extest_selected_o ( ),
.bs_chain_i ( 1'b0 ),
.bs_chain_o ( ),
// RISC signals
.risc_clk_i ( wb_clk ),
.risc_addr_o ( dbg_adr ),
.risc_data_i ( dbg_dat_risc ),
.risc_data_o ( dbg_dat_dbg ),
.wp_i ( dbg_wp ),
.bp_i ( dbg_bp ),
.opselect_o ( dbg_op ),
.lsstatus_i ( dbg_lss ),
.istatus_i ( dbg_is ),
.risc_stall_o ( dbg_stall ),
.reset_o ( ),
// WISHBONE common
.wb_clk_i ( wb_clk ),
.wb_rst_i ( wb_rst ),
// WISHBONE master interface
.wb_adr_o ( wb_dm_adr_o ),
.wb_dat_i ( wb_dm_dat_i ),
.wb_dat_o ( wb_dm_dat_o ),
.wb_sel_o ( wb_dm_sel_o ),
.wb_we_o ( wb_dm_we_o ),
.wb_stb_o ( wb_dm_stb_o ),
.wb_cyc_o ( wb_dm_cyc_o ),
.wb_cab_o ( wb_dm_cab_o ),
.wb_ack_i ( wb_dm_ack_i ),
.wb_err_i ( wb_dm_err_i )
);
hope it helps.
Kind regards,
José Ignacio Villar.
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