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fpga: x400: Adjust SPI engine strobes alignment

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Modify behavior of clock crossing between radio_clk and radio_clk_2x.
This ensures strobe signals are always asserted for a single
radio_clk_2x cycle and when radio_clk is low.


Original-commit: adb352a2ad81d7c6d70ec5880a787b6bab7d19ba
This commit is contained in:
Javier Valenzuela
2022-03-04 09:41:24 -06:00
committed by Wade Fife
parent 8630f2616c
commit 56b8f83341
4 changed files with 14 additions and 9 deletions
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top/x400/doc/X4XX_FPGA_right.htm
+2 -2
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@@ -24131,9 +24131,9 @@ FPGA version.<BR/>
<tr valign="top">
<td class='value'>570500626</td>
<td class='value'>570565649</td>
<td class='l'>0x22012612</td>
<td class='l'>0x22022411</td>
<td class="l" style="text-align: left;">
<p class="name"><a name='VERSIONING_REGS_REGMAP|FPGA_VERSION|FPGA_VERSION_LAST_MODIFIED_TIME'></a>FPGA_VERSION_LAST_MODIFIED_TIME</p>
top/x400/regmap/versioning_regs_regmap_utils.vh
+1 -1
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@@ -85,7 +85,7 @@
localparam FPGA_CURRENT_VERSION_MINOR = 'h6; // FPGA_VERSION:FPGA_CURRENT_VERSION_MINOR
localparam FPGA_CURRENT_VERSION_MAJOR = 'h7; // FPGA_VERSION:FPGA_CURRENT_VERSION_MAJOR
localparam FPGA_OLDEST_COMPATIBLE_VERSION_MAJOR = 'h7; // FPGA_VERSION:FPGA_OLDEST_COMPATIBLE_VERSION_MAJOR
localparam FPGA_VERSION_LAST_MODIFIED_TIME = 'h22012612; // FPGA_VERSION:FPGA_VERSION_LAST_MODIFIED_TIME
localparam FPGA_VERSION_LAST_MODIFIED_TIME = 'h22022411; // FPGA_VERSION:FPGA_VERSION_LAST_MODIFIED_TIME
// Enumerated type RF_CORE_100M_VERSION
localparam RF_CORE_100M_VERSION_SIZE = 7;
top/x400/x4xx.v
+1 -1
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@@ -2289,7 +2289,7 @@ endmodule
// <value name="FPGA_OLDEST_COMPATIBLE_VERSION_MAJOR" integer="7"/>
// <value name="FPGA_OLDEST_COMPATIBLE_VERSION_MINOR" integer="0"/>
// <value name="FPGA_OLDEST_COMPATIBLE_VERSION_BUILD" integer="0"/>
// <value name="FPGA_VERSION_LAST_MODIFIED_TIME" integer="0x22012612"/>
// <value name="FPGA_VERSION_LAST_MODIFIED_TIME" integer="0x22022411"/>
// </enumeratedtype>
// </group>
//</regmap>
top/x400/x4xx_gpio_spi.v
+10 -5
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@@ -342,13 +342,18 @@ module x4xx_gpio_spi #(
// Register set_stb for use in 2x domain.
reg set_stb_2x = 1'b0;
reg ctrlport_clk_phase = 1'b0;
reg ctrlport_clk_phase = 1'b1;
always @ (posedge ctrlport_clk_2x) begin
// Assert strobe only during a single 2x cycle of the
// 1x pulse.
set_stb_2x <= ctrlport_clk_phase & set_stb;
ctrlport_clk_phase <= ~ctrlport_clk_phase;
if (ctrlport_rst) begin
ctrlport_clk_phase <= 1'b1;
set_stb_2x <= 1'b0;
end else begin
// Assert strobe only during a single 2x cycle of the
// 1x pulse, when 1x clock is low.
set_stb_2x <= ctrlport_clk_phase & set_stb;
ctrlport_clk_phase <= ~ctrlport_clk_phase;
end
end
simple_spi_core #(