Added 'modexpa7_' prefix to all the low-level modules in /src/rtl/pe/ to prevent clashes

with low-level modules in ECDSA multipliers.

We should consolidate all the lowel-level stuff across all the math cores in the future.

1 files changed, 85 insertions, 0 deletions

diff --git a/src/rtl/pe/generic/modexpa7_systolic_pe_generic.v b/src/rtl/pe/generic/modexpa7_systolic_pe_generic.v
new file mode 100644
index 0000000..389b1f9
--- /dev/null
+++ b/src/rtl/pe/generic/modexpa7_systolic_pe_generic.v
@@ -0,0 +1,85 @@
+//======================================================================
+//
+// modexpa7_systolic_pe_generic.v
+// -----------------------------------------------------------------------------
+// Generic low-level systolic array processing element.
+//
+// Authors: Pavel Shatov
+//
+// Copyright (c) 2017, NORDUnet A/S All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// - Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+//
+// - Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+//
+// - Neither the name of the NORDUnet nor the names of its contributors may
+//   be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+//======================================================================
+
+module modexpa7_systolic_pe_generic
+	(
+		input					clk,
+		input		[31: 0]	a,
+		input		[31: 0]	b,
+		input		[31: 0]	t,
+		input		[31: 0]	c_in,
+		output	[31: 0]	p,
+		output	[31: 0]	c_out
+	);
+
+		//
+		// Customizable Latency
+		//
+	parameter LATENCY = 4;
+		
+		//
+		// Delay Line
+		//
+	reg	[63: 0]	abct[1:LATENCY];
+	
+		//
+		// Outputs
+		//
+	assign p			= abct[LATENCY][31: 0];
+	assign c_out	= abct[LATENCY][63:32];
+
+		//
+		// Sub-products
+		//
+	wire	[63: 0]	ab = {{32{1'b0}}, a}    * {{32{1'b0}}, b};
+	wire	[63: 0]	ct = {{32{1'b0}}, c_in} + {{32{1'b0}}, t};
+
+		//
+		// Delay
+		//
+	integer i;
+	always @(posedge clk)
+		//
+		for (i=1; i<=LATENCY; i=i+1)
+			abct[i] <= (i == 1) ? ab + ct : abct[i-1];
+
+endmodule
+
+//======================================================================
+// End of file
+//======================================================================