updates

lab4/vivado/z710v1.3/z710v1.3.xdc

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+## This file is for SYSU computer organization courses.
+## used for Zynq7010 fpga revision 1.3 2024/02
+
+
+
+# clock, 50 MHz
+set_property IOSTANDARD LVCMOS33 [get_ports io_clock];
+set_property PACKAGE_PIN U18 [get_ports io_clock];
+create_clock -period 20.000 -name io_clock -waveform {0.000 10.000} -add [get_ports io_clock];
+
+# LEDs
+set_property IOSTANDARD LVCMOS33 [get_ports io_led];
+set_property PACKAGE_PIN J16 [get_ports io_led];   # PL_LED0
+#set_property -dict {PACKAGE_PIN M14 IOSTANDARD LVCMOS33} [get_ports io_led_1];
+#set_property -dict {PACKAGE_PIN M15 IOSTANDARD LVCMOS33} [get_ports io_led_2];
+
+# switches
+set_property -dict {PACKAGE_PIN V17 IOSTANDARD LVCMOS33} [get_ports clk_enable]; # PL_SW1
+set_property -dict {PACKAGE_PIN Y16 IOSTANDARD LVCMOS33} [get_ports io_reset];  # PL_SW2
+
+# do NOT assign reset to ANY BUTTON in Vivado 2020, its Utility Vector Logic Not cause unstable TX output
+# while this isn't present in Vivado 2022
+
+
+
+# UART ports
+# rxd assigned to constant 1
+set_property IOSTANDARD LVCMOS33 [get_ports UART0_TX_0]
+set_property PACKAGE_PIN J15 [get_ports UART0_TX_0]
+set_property IOSTANDARD LVCMOS33 [get_ports UART0_RX_0]
+set_property PACKAGE_PIN T19 [get_ports UART0_RX_0]