Rename a few reset signals

clk -> ext_clk
reset_n -> ext_rst
reset -> rst

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>

fpga/arty_a7-35.xdc

@@ -1,7 +1,7 @@
-set_property -dict { PACKAGE_PIN E3    IOSTANDARD LVCMOS33 } [get_ports { clk }];
-create_clock -add -name sys_clk_pin -period 10.00 -waveform {0 5} [get_ports { clk }];
+set_property -dict { PACKAGE_PIN E3    IOSTANDARD LVCMOS33 } [get_ports { ext_clk }];
+create_clock -add -name sys_clk_pin -period 10.00 -waveform {0 5} [get_ports { ext_clk }];
 
-set_property -dict { PACKAGE_PIN C2    IOSTANDARD LVCMOS33 } [get_ports { reset_n }];
+set_property -dict { PACKAGE_PIN C2    IOSTANDARD LVCMOS33 } [get_ports { ext_rst }];
 
 set_property -dict { PACKAGE_PIN D10   IOSTANDARD LVCMOS33 } [get_ports { uart0_txd }];
 set_property -dict { PACKAGE_PIN A9    IOSTANDARD LVCMOS33 } [get_ports { uart0_rxd }];

fpga/nexys-video.xdc

@@ -1,7 +1,7 @@
-set_property -dict {PACKAGE_PIN R4 IOSTANDARD LVCMOS33} [get_ports clk]
-create_clock -period 10.000 -name sys_clk_pin -waveform {0.000 5.000} -add [get_ports clk]
+set_property -dict {PACKAGE_PIN R4 IOSTANDARD LVCMOS33} [get_ports ext_clk]
+create_clock -period 10.000 -name sys_clk_pin -waveform {0.000 5.000} -add [get_ports ext_clk]
 
-set_property -dict {PACKAGE_PIN G4 IOSTANDARD LVCMOS15} [get_ports reset_n]
+set_property -dict {PACKAGE_PIN G4 IOSTANDARD LVCMOS15} [get_ports ext_rst]
 
 set_property -dict {PACKAGE_PIN AA19 IOSTANDARD LVCMOS33} [get_ports uart0_txd]
 set_property -dict {PACKAGE_PIN V18 IOSTANDARD LVCMOS33} [get_ports uart0_rxd]

fpga/nexys_a7.xdc

@@ -1,7 +1,7 @@
-set_property -dict {PACKAGE_PIN E3 IOSTANDARD LVCMOS33} [get_ports clk]
-create_clock -period 10.000 -name sys_clk_pin -waveform {0.000 5.000} -add [get_ports clk]
+set_property -dict {PACKAGE_PIN E3 IOSTANDARD LVCMOS33} [get_ports ext_clk]
+create_clock -period 10.000 -name sys_clk_pin -waveform {0.000 5.000} -add [get_ports ext_clk]
 
-set_property -dict {PACKAGE_PIN C12 IOSTANDARD LVCMOS33} [get_ports reset_n]
+set_property -dict {PACKAGE_PIN C12 IOSTANDARD LVCMOS33} [get_ports ext_rst]
 
 set_property -dict {PACKAGE_PIN D4 IOSTANDARD LVCMOS33} [get_ports uart0_txd]
 set_property -dict {PACKAGE_PIN C4 IOSTANDARD LVCMOS33} [get_ports uart0_rxd]

fpga/toplevel.vhd

@@ -16,8 +16,8 @@ entity toplevel is
     MEMORY_SIZE   : positive := 524288;
     RAM_INIT_FILE : string   := "firmware.hex");
 	port(
-		clk       : in  std_logic;
-		reset_n   : in  std_logic;
+		ext_clk   : in  std_logic;
+		ext_rst   : in  std_logic;
 		
 		-- UART0 signals:
 		uart0_txd : out std_logic;
@@ -28,7 +28,7 @@ end entity toplevel;
 architecture behaviour of toplevel is
 
 	-- Reset signals:
-	signal reset : std_logic;
+	signal rst : std_logic;
 
 	-- Internal clock signals:
 	signal system_clk : std_logic;
@@ -86,7 +86,7 @@ begin
 	address_decoder: process(system_clk)
 	begin
 		if rising_edge(system_clk) then
-			if reset = '1' then
+			if rst = '1' then
 				intercon_peripheral <= PERIPHERAL_NONE;
 				intercon_busy <= false;
 			else
@@ -140,16 +140,16 @@ begin
 	reset_controller: entity work.pp_soc_reset
 		port map(
 			clk => system_clk,
-			reset_n => reset_n,
-			reset_out => reset,
+			reset_n => ext_rst,
+			reset_out => rst,
 			system_clk => system_clk,
 			system_clk_locked => system_clk_locked
 		);
 
 	clkgen: entity work.clock_generator
 		port map(
-			clk => clk,
-			resetn => reset_n,
+			clk => ext_clk,
+			resetn => ext_rst,
 			system_clk => system_clk,
 			locked => system_clk_locked
 		);
@@ -157,7 +157,7 @@ begin
 	processor: entity work.core
 		port map(
 			clk => system_clk,
-			rst => reset,
+			rst => rst,
 
 			wishbone_out => wishbone_proc_out,
 			wishbone_in => wishbone_proc_in
@@ -176,7 +176,7 @@ begin
 			FIFO_DEPTH => 32
 		) port map(
 			clk => system_clk,
-			reset => reset,
+			reset => rst,
 			txd => uart0_txd,
 			rxd => uart0_rxd,
 			wb_adr_in => uart0_adr_in,
@@ -199,7 +199,7 @@ begin
 			RAM_INIT_FILE => RAM_INIT_FILE
 		) port map(
 			clk => system_clk,
-			reset => reset,
+			reset => rst,
 			wb_adr_in => main_memory_adr_in,
 			wb_dat_in => main_memory_dat_in,
 			wb_dat_out => main_memory_dat_out,