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Generate all clocks for the DDR PHY

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commit 72f9af9d90ee437aa0a4892628624e044fe43e84 1 parent 859c9d8
@sbourdeauducq sbourdeauducq authored
View
4 build.py
@@ -10,7 +10,7 @@ def add_core_dir(d):
def add_core_files(d, files):
for f in files:
verilog_sources.append(os.path.join("verilog", d, f))
-add_core_dir("m1reset")
+add_core_dir("m1crg")
add_core_files("lm32", ["lm32_cpu.v", "lm32_instruction_unit.v", "lm32_decoder.v",
"lm32_load_store_unit.v", "lm32_adder.v", "lm32_addsub.v", "lm32_logic_op.v",
"lm32_shifter.v", "lm32_multiplier_spartan6.v", "lm32_mc_arithmetic.v",
@@ -59,4 +59,4 @@ def str2file(filename, contents):
os.system("par -ol high -w soc.ncd soc-routed.ncd")
# bitgen
-os.system("bitgen -g LCK_cycle:6 -g Binary:Yes -g INIT_9K:Yes -w soc-routed.ncd soc.bit")
+os.system("bitgen -g Binary:Yes -g INIT_9K:Yes -w soc-routed.ncd soc.bit")
View
14 constraints.py
@@ -1,4 +1,4 @@
-def get(ns, clkfx_sys, reset0, norflash0, uart0):
+def get(ns, crg0, norflash0, uart0):
constraints = []
def add(signal, pin, vec=-1, iostandard="LVCMOS33", extra=""):
constraints.append((ns.get_name(signal), vec, pin, iostandard, extra))
@@ -8,12 +8,12 @@ def add_vec(signal, pins, iostandard="LVCMOS33", extra=""):
add(signal, p, i, iostandard, extra)
i += 1
- add(clkfx_sys.clkin, "AB11", extra="TNM_NET = \"GRPclk50\"")
-
- add(reset0.trigger_reset, "AA4")
- add(reset0.ac97_rst_n, "D6")
- add(reset0.videoin_rst_n, "W17")
- add(reset0.flash_rst_n, "P22", extra="SLEW = FAST | DRIVE = 8")
+ add(crg0.clkin, "AB11", extra="TNM_NET = \"GRPclk50\"")
+ add(crg0.ac97_rst_n, "D6")
+ add(crg0.videoin_rst_n, "W17")
+ add(crg0.flash_rst_n, "P22", extra="SLEW = FAST | DRIVE = 8")
+ add(crg0.rd_clk_lb, "K5")
+ add(crg0.trigger_reset, "AA4")
add_vec(norflash0.adr, ["L22", "L20", "K22", "K21", "J19", "H20", "F22",
"F21", "K17", "J17", "E22", "E20", "H18", "H19", "F20",
View
51 milkymist/m1crg/__init__.py
@@ -0,0 +1,51 @@
+from fractions import Fraction
+
+from migen.fhdl.structure import *
+
+class M1CRG:
+ def __init__(self, infreq, outfreq1x):
+ self.clkin = Signal()
+ self.trigger_reset = Signal()
+
+ generated = []
+ for name in [
+ "sys_clk",
+ "sys_rst",
+ "ac97_rst_n",
+ "videoin_rst_n",
+ "flash_rst_n",
+ "clk2x_90",
+ "clk4x_wr_left",
+ "clk4x_wr_strb_left",
+ "clk4x_wr_right",
+ "clk4x_wr_strb_right",
+ "clk4x_rd_left",
+ "clk4x_rd_strb_left",
+ "clk4x_rd_right",
+ "clk4x_rd_strb_right"
+ ]:
+ s = Signal(name=name)
+ setattr(self, name, s)
+ generated.append((name, s))
+
+ self.rd_clk_lb = Signal()
+
+ ratio = Fraction(outfreq1x)/Fraction(infreq)
+ in_period = float(Fraction(1000000000)/Fraction(infreq))
+
+ self._inst = Instance("m1crg",
+ generated,
+ [
+ ("clkin", self.clkin),
+ ("trigger_reset", self.trigger_reset),
+ ("rd_clk_lb", self.rd_clk_lb) # TODO: inout
+ ], [
+ ("in_period", in_period),
+ ("f_mult", ratio.numerator),
+ ("f_div", ratio.denominator)
+ ]
+ )
+
+ def get_fragment(self):
+ return Fragment(instances=[self._inst],
+ pads={self.clkin, self.ac97_rst_n, self.videoin_rst_n, self.flash_rst_n, self.rd_clk_lb})
View
20 milkymist/m1reset/__init__.py
@@ -1,20 +0,0 @@
-from migen.fhdl.structure import *
-
-class M1Reset:
- def __init__(self):
- self.trigger_reset = Signal()
- self.sys_rst = Signal()
- self.ac97_rst_n = Signal()
- self.videoin_rst_n = Signal()
- self.flash_rst_n = Signal()
- self._inst = Instance("m1reset",
- [("sys_rst", self.sys_rst),
- ("ac97_rst_n", self.ac97_rst_n),
- ("videoin_rst_n", self.videoin_rst_n),
- ("flash_rst_n", self.flash_rst_n)],
- [("trigger_reset", self.trigger_reset)],
- clkport="sys_clk")
-
- def get_fragment(self):
- return Fragment(instances=[self._inst],
- pads={self.ac97_rst_n, self.videoin_rst_n, self.flash_rst_n})
View
20 top.py
@@ -1,12 +1,14 @@
+from fractions import Fraction
+
from migen.fhdl.structure import *
from migen.fhdl import verilog, autofragment
from migen.bus import wishbone, asmibus, wishbone2asmi, csr, wishbone2csr
-from milkymist import m1reset, clkfx, lm32, norflash, uart, sram
+from milkymist import m1crg, lm32, norflash, uart, sram#, s6ddrphy
import constraints
MHz = 1000000
-clk_freq = 80*MHz
+clk_freq = (83 + Fraction(1, 3))*MHz
sram_size = 4096 # in bytes
l2_size = 8192 # in bytes
@@ -14,7 +16,8 @@ def get():
#
# ASMI
#
- asmihub0 = asmibus.Hub(24, 64, 8) # TODO: get hub from memory controller
+ #ddrphy0 = s6ddrphy.S6DDRPHY(13, 2, 128)
+ asmihub0 = asmibus.Hub(23, 128, 12) # TODO: get hub from memory controller
asmiport_wb = asmihub0.get_port()
asmihub0.finalize()
@@ -62,15 +65,14 @@ def get():
#
# Housekeeping
#
- clkfx_sys = clkfx.ClkFX(50*MHz, clk_freq)
- reset0 = m1reset.M1Reset()
+ crg0 = m1crg.M1CRG(50*MHz, clk_freq)
frag = autofragment.from_local() + interrupts
src_verilog, vns = verilog.convert(frag,
- {clkfx_sys.clkin, reset0.trigger_reset},
+ {crg0.trigger_reset},
name="soc",
- clk_signal=clkfx_sys.clkout,
- rst_signal=reset0.sys_rst,
+ clk_signal=crg0.sys_clk,
+ rst_signal=crg0.sys_rst,
return_ns=True)
- src_ucf = constraints.get(vns, clkfx_sys, reset0, norflash0, uart0)
+ src_ucf = constraints.get(vns, crg0, norflash0, uart0)
return (src_verilog, src_ucf)
View
424 verilog/m1crg/m1crg.v
@@ -0,0 +1,424 @@
+/*
+ * Milkymist-NG SoC
+ * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+module m1crg #(
+ parameter in_period = 0.0,
+ parameter f_mult = 0,
+ parameter f_div = 0,
+ parameter clk2x_period = (in_period*f_div)/(2.0*f_mult)
+) (
+ input clkin,
+ input trigger_reset,
+
+ output sys_clk,
+ output reg sys_rst,
+
+ /* Reset off-chip devices */
+ output ac97_rst_n,
+ output videoin_rst_n,
+ output flash_rst_n,
+
+ /* DDR PHY clocks and reset */
+ output clk2x_90,
+ output clk4x_wr_left,
+ output clk4x_wr_strb_left,
+ output clk4x_wr_right,
+ output clk4x_wr_strb_right,
+ output clk4x_rd_left,
+ output clk4x_rd_strb_left,
+ output clk4x_rd_right,
+ output clk4x_rd_strb_right,
+ inout rd_clk_lb /* < unconnected clock pin for read clock PLL loopback */
+);
+
+/*
+ * Reset
+ */
+
+wire reset_n;
+
+reg [19:0] rst_debounce;
+always @(posedge sys_clk, negedge reset_n) begin
+ if(~reset_n) begin
+ rst_debounce <= 20'hFFFFF;
+ sys_rst <= 1'b1;
+ end else begin
+ if(trigger_reset)
+ rst_debounce <= 20'hFFFFF;
+ else if(rst_debounce != 20'd0)
+ rst_debounce <= rst_debounce - 20'd1;
+ sys_rst <= rst_debounce != 20'd0;
+ end
+end
+
+assign ac97_rst_n = ~sys_rst;
+assign videoin_rst_n = ~sys_rst;
+
+/*
+ * We must release the Flash reset before the system reset
+ * because the Flash needs some time to come out of reset
+ * and the CPU begins fetching instructions from it
+ * as soon as the system reset is released.
+ * From datasheet, minimum reset pulse width is 100ns
+ * and reset-to-read time is 150ns.
+ */
+
+reg [7:0] flash_rstcounter;
+
+always @(posedge sys_clk, negedge reset_n) begin
+ if(~reset_n) begin
+ flash_rstcounter <= 8'd0;
+ end else begin
+ if(trigger_reset)
+ flash_rstcounter <= 8'd0;
+ else if(~flash_rstcounter[7])
+ flash_rstcounter <= flash_rstcounter + 8'd1;
+ end
+end
+
+assign flash_rst_n = flash_rstcounter[7];
+
+/*
+ * Clock management. Largely taken from the NWL reference design.
+ */
+
+wire sdr_clkin;
+wire clkdiv;
+
+IBUF #(
+ .IOSTANDARD("DEFAULT")
+) clk2_iob (
+ .I(clkin),
+ .O(sdr_clkin)
+);
+
+BUFIO2 #(
+ .DIVIDE(1),
+ .DIVIDE_BYPASS("FALSE"),
+ .I_INVERT("FALSE")
+) bufio2_inst2 (
+ .I(sdr_clkin),
+ .IOCLK(),
+ .DIVCLK(clkdiv),
+ .SERDESSTROBE()
+);
+
+wire pll1_lckd;
+wire buf_pll1_fb_out;
+wire pll1out0;
+wire pll1out1;
+wire pll1out2;
+wire pll1out3;
+
+PLL_ADV #(
+ .BANDWIDTH("OPTIMIZED"),
+ .CLKFBOUT_MULT(4*f_mult),
+ .CLKFBOUT_PHASE(0.0),
+ .CLKIN1_PERIOD(in_period),
+ .CLKIN2_PERIOD(in_period),
+ .CLKOUT0_DIVIDE(f_div),
+ .CLKOUT0_DUTY_CYCLE(0.5),
+ .CLKOUT0_PHASE(0),
+ .CLKOUT1_DIVIDE(f_div),
+ .CLKOUT1_DUTY_CYCLE(0.5),
+ .CLKOUT1_PHASE(0),
+ .CLKOUT2_DIVIDE(4*f_div),
+ .CLKOUT2_DUTY_CYCLE(0.5),
+ .CLKOUT2_PHASE(0.0),
+ .CLKOUT3_DIVIDE(2*f_div),
+ .CLKOUT3_DUTY_CYCLE(0.5),
+ .CLKOUT3_PHASE(90),
+ .CLKOUT4_DIVIDE(7),
+ .CLKOUT4_DUTY_CYCLE(0.5),
+ .CLKOUT4_PHASE(0),
+ .CLKOUT5_DIVIDE(7),
+ .CLKOUT5_DUTY_CYCLE(0.5),
+ .CLKOUT5_PHASE(0.0),
+ .COMPENSATION("INTERNAL"),
+ .DIVCLK_DIVIDE(1),
+ .REF_JITTER(0.100),
+ .CLK_FEEDBACK("CLKFBOUT"),
+ .SIM_DEVICE("SPARTAN6")
+) pll1 (
+ .CLKFBDCM(),
+ .CLKFBOUT(buf_pll1_fb_out),
+ .CLKOUT0(pll1out0), /* < x4 180 clock for transmitter */
+ .CLKOUT1(pll1out1), /* < x4 180 clock for transmitter */
+ .CLKOUT2(pll1out2), /* < x1 clock for memory controller */
+ .CLKOUT3(pll1out3), /* < x2 90 clock to generate memory clock, clock DQS and memory address and control signals. */
+ .CLKOUT4(),
+ .CLKOUT5(),
+ .CLKOUTDCM0(),
+ .CLKOUTDCM1(),
+ .CLKOUTDCM2(),
+ .CLKOUTDCM3(),
+ .CLKOUTDCM4(),
+ .CLKOUTDCM5(),
+ .DO(),
+ .DRDY(),
+ .LOCKED(pll1_lckd),
+ .CLKFBIN(buf_pll1_fb_out),
+ .CLKIN1(clkdiv),
+ .CLKIN2(1'b0),
+ .CLKINSEL(1'b1),
+ .DADDR(5'b00000),
+ .DCLK(1'b0),
+ .DEN(1'b0),
+ .DI(16'h0000),
+ .DWE(1'b0),
+ .RST(1'b0),
+ .REL(1'b0)
+);
+
+BUFPLL #(
+ .DIVIDE(4)
+) wr_bufpll_left (
+ .PLLIN(pll1out0),
+ .GCLK(sys_clk),
+ .LOCKED(pll1_lckd),
+ .IOCLK(clk4x_wr_left),
+ .LOCK(),
+ .SERDESSTROBE(clk4x_wr_strb_left)
+);
+
+BUFPLL #(
+ .DIVIDE(4)
+) wr_bufpll_right (
+ .PLLIN(pll1out1),
+ .GCLK(sys_clk),
+ .LOCKED(pll1_lckd),
+ .IOCLK(clk4x_wr_right),
+ .LOCK(),
+ .SERDESSTROBE(clk4x_wr_strb_right)
+);
+
+BUFG bufg_x1(
+ .I(pll1out2),
+ .O(sys_clk)
+);
+
+BUFG bufg_x2_2(
+ .I(pll1out3),
+ .O(clk2x_90)
+);
+
+/*
+ * Generate clk4x_rd. This clock is sourced from clk2x_90.
+ * An IODELAY2 element is included in the path of this clock so that
+ * any variation in IDELAY element's base delay is compensated when this clock
+ * is used to capture read data which also goes through IDELAY element.
+ */
+
+wire rd_clk_out;
+
+ODDR2 #(
+ .DDR_ALIGNMENT("C0"),
+ .INIT(1'b0),
+ .SRTYPE("ASYNC")
+) rd_clk_out_inst (
+ .Q(rd_clk_out),
+ .C0(clk2x_90),
+ .C1(~clk2x_90),
+ .CE(1'b1),
+ .D0(1'b1),
+ .D1(1'b0),
+ .R(1'b0),
+ .S(1'b0)
+);
+
+wire rd_clk_out_oe_n;
+
+ODDR2 #(
+ .DDR_ALIGNMENT("C0"),
+ .INIT(1'b0),
+ .SRTYPE("ASYNC")
+) rd_clk_out_oe_inst (
+ .Q(rd_clk_out_oe_n),
+ .C0(clk2x_90),
+ .C1(~clk2x_90),
+ .CE(1'b1),
+ .D0(1'b0),
+ .D1(1'b0),
+ .R(1'b0),
+ .S(1'b0)
+);
+
+wire rd_clk_fb;
+
+/* Dummy pin used for calibration */
+IOBUF rd_clk_loop_back_inst(
+ .O(rd_clk_fb),
+ .IO(rd_clk_lb),
+ .I(rd_clk_out),
+ .T(rd_clk_out_oe_n)
+);
+
+wire rd_clk_fb_dly;
+
+IODELAY2 #(
+ .DATA_RATE("DDR"),
+ .IDELAY_VALUE(0),
+ .IDELAY2_VALUE(0),
+ .IDELAY_MODE("NORMAL"),
+ .ODELAY_VALUE(0),
+ .IDELAY_TYPE("FIXED"),
+ .COUNTER_WRAPAROUND("STAY_AT_LIMIT"),
+ .DELAY_SRC("IDATAIN"),
+ .SERDES_MODE("NONE"),
+ .SIM_TAPDELAY_VALUE(49)
+) iodelay_cm (
+ .IDATAIN(rd_clk_fb),
+ .TOUT(),
+ .DOUT(),
+ .T(1'b1),
+ .ODATAIN(1'b0),
+ .DATAOUT(rd_clk_fb_dly),
+ .DATAOUT2(),
+ .IOCLK0(1'b0),
+ .IOCLK1(1'b0),
+ .CLK(1'b0),
+ .CAL(1'b0),
+ .INC(1'b0),
+ .CE(1'b0),
+ .RST(1'b0),
+ .BUSY()
+);
+
+wire rd_clk_fb_dly_bufio;
+
+BUFIO2 #(
+ .DIVIDE(1),
+ .DIVIDE_BYPASS("FALSE"),
+ .I_INVERT("FALSE")
+) bufio2_inst (
+ .I(rd_clk_fb_dly),
+ .IOCLK(),
+ .DIVCLK(rd_clk_fb_dly_bufio),
+ .SERDESSTROBE()
+);
+
+wire pll2_lckd;
+wire buf_pll2_fb_out;
+wire pll2out0;
+wire pll2out1;
+
+PLL_ADV #(
+ .BANDWIDTH("OPTIMIZED"),
+ .CLKFBOUT_MULT(4),
+ .CLKFBOUT_PHASE(0.0),
+ .CLKIN1_PERIOD(clk2x_period),
+ .CLKIN2_PERIOD(clk2x_period),
+ .CLKOUT0_DIVIDE(2),
+ .CLKOUT0_DUTY_CYCLE(0.5),
+ .CLKOUT0_PHASE(0.0),
+ .CLKOUT1_DIVIDE(2),
+ .CLKOUT1_DUTY_CYCLE(0.5),
+ .CLKOUT1_PHASE(0.0),
+ .CLKOUT2_DIVIDE(7),
+ .CLKOUT2_DUTY_CYCLE(0.5),
+ .CLKOUT2_PHASE(0.0),
+ .CLKOUT3_DIVIDE(7),
+ .CLKOUT3_DUTY_CYCLE(0.5),
+ .CLKOUT3_PHASE(0.0),
+ .CLKOUT4_DIVIDE(7),
+ .CLKOUT4_DUTY_CYCLE(0.5),
+ .CLKOUT4_PHASE(0.0),
+ .CLKOUT5_DIVIDE(7),
+ .CLKOUT5_DUTY_CYCLE (0.5),
+ .CLKOUT5_PHASE(0.0),
+ .COMPENSATION("INTERNAL"),
+ .DIVCLK_DIVIDE(1),
+ .REF_JITTER(0.100),
+ .CLK_FEEDBACK("CLKFBOUT"),
+ .SIM_DEVICE("SPARTAN6")
+) pll2 (
+ .CLKFBDCM(),
+ .CLKFBOUT(buf_pll2_fb_out),
+ .CLKOUT0(pll2out0), /* < x4 clock to capture read data */
+ .CLKOUT1(pll2out1), /* < x4 clock to capture read data */
+ .CLKOUT2(),
+ .CLKOUT3(),
+ .CLKOUT4(),
+ .CLKOUT5(),
+ .CLKOUTDCM0(),
+ .CLKOUTDCM1(),
+ .CLKOUTDCM2(),
+ .CLKOUTDCM3(),
+ .CLKOUTDCM4(),
+ .CLKOUTDCM5(),
+ .DO(),
+ .DRDY(),
+ .LOCKED(pll2_lckd),
+ .CLKFBIN(buf_pll2_fb_out),
+ .CLKIN1(rd_clk_fb_dly_bufio),
+ .CLKIN2(1'b0),
+ .CLKINSEL(1'b1),
+ .DADDR(5'b00000),
+ .DCLK(1'b0),
+ .DEN(1'b0),
+ .DI(16'h0000),
+ .DWE(1'b0),
+ .RST(~pll1_lckd),
+ .REL(1'b0)
+);
+
+BUFPLL #(
+ .DIVIDE(4)
+) rd_bufpll_left (
+ .PLLIN(pll2out0),
+ .GCLK(sys_clk),
+ .LOCKED(pll2_lckd),
+ .IOCLK(clk4x_rd_left),
+ .LOCK(),
+ .SERDESSTROBE(clk4x_rd_strb_left)
+);
+
+BUFPLL #(
+ .DIVIDE(4)
+) rd_bufpll_right (
+ .PLLIN(pll2out1),
+ .GCLK(sys_clk),
+ .LOCKED(pll2_lckd),
+ .IOCLK(clk4x_rd_right),
+ .LOCK(),
+ .SERDESSTROBE(clk4x_rd_strb_right)
+);
+
+wire sdram_sys_clk_lock_d16;
+reg sdram_sys_clk_lock_d17;
+
+/*
+ * Async reset generation
+ * The reset is de-asserted 16 clocks after both internal clocks are locked.
+ */
+
+SRL16 reset_delay_sr(
+ .CLK(sys_clk),
+ .D(pll1_lckd & pll2_lckd),
+ .A0(1'b1),
+ .A1(1'b1),
+ .A2(1'b1),
+ .A3(1'b1),
+ .Q(sdram_sys_clk_lock_d16)
+);
+
+always @(posedge sys_clk)
+ sdram_sys_clk_lock_d17 <= sdram_sys_clk_lock_d16;
+
+assign reset_n = sdram_sys_clk_lock_d17;
+
+endmodule
View
62 verilog/m1reset/m1reset.v
@@ -1,62 +0,0 @@
-/*
- * Milkymist-NG SoC
- * Copyright (C) 2007, 2008, 2009, 2010, 2011 Sebastien Bourdeauducq
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, version 3 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-module m1reset(
- input sys_clk,
- input trigger_reset,
-
- output reg sys_rst,
- output ac97_rst_n,
- output videoin_rst_n,
- output flash_rst_n
-);
-
-reg [19:0] rst_debounce;
-initial rst_debounce <= 20'hFFFFF;
-initial sys_rst <= 1'b1;
-always @(posedge sys_clk) begin
- if(trigger_reset)
- rst_debounce <= 20'hFFFFF;
- else if(rst_debounce != 20'd0)
- rst_debounce <= rst_debounce - 20'd1;
- sys_rst <= rst_debounce != 20'd0;
-end
-
-assign ac97_rst_n = ~sys_rst;
-assign videoin_rst_n = ~sys_rst;
-
-/*
- * We must release the Flash reset before the system reset
- * because the Flash needs some time to come out of reset
- * and the CPU begins fetching instructions from it
- * as soon as the system reset is released.
- * From datasheet, minimum reset pulse width is 100ns
- * and reset-to-read time is 150ns.
- */
-
-reg [7:0] flash_rstcounter;
-initial flash_rstcounter <= 8'd0;
-always @(posedge sys_clk) begin
- if(trigger_reset)
- flash_rstcounter <= 8'd0;
- else if(~flash_rstcounter[7])
- flash_rstcounter <= flash_rstcounter + 8'd1;
-end
-
-assign flash_rst_n = flash_rstcounter[7];
-
-endmodule
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