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// SPDX-FileCopyrightText: Copyright 2020 Jecel Mattos de Assumpcao Jr
//
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This uses the building blocks for Morphle Logic, an asynchronous
// runtime reconfigurable array (ARRA), as found in ycell.v to create
// a block of yellow cells wired together and with ports to connect
// to other blocks
// many signals are two bit busses
`define Vempty 0
`define V0 1
`define V1 2
// the combination 3 is not defined
module yblock #(parameter
BLOCKWIDTH = 8,
BLOCKHEIGHT = 8,
HMSB = BLOCKWIDTH-1,
HMSB2 = (2*BLOCKWIDTH)-1,
VMSB = BLOCKHEIGHT-1,
VMSB2 = (2*BLOCKHEIGHT)-1)
(
// control
input reset, // freezes the cell operations and clears everything
input confclk, // a strobe to enter one configuration bit
input [HMSB:0] cbitin, // new configuration bit from previous cell (U)
output [HMSB:0] cbitout, // configuration bit to next cell (D)
output [HMSB:0] lhempty, // this cell interrupts horizontal signals to left
output [HMSB:0] uvempty, // this cell interrupts vertical signals to up
output [HMSB:0] rhempty, // this cell interrupts horizontal signals to right
output [HMSB:0] dvempty, // this cell interrupts vertical signals to down
// UP
input [HMSB:0] uempty, // cells U is empty, so we are the topmost of a signal
input [HMSB2:0] uin,
output [HMSB2:0] uout,
// DOWN
input [HMSB:0] dempty, // cells D is empty, so we are the bottommost of a signal
input [HMSB2:0] din,
output [HMSB2:0] dout,
// LEFT
input [VMSB:0] lempty, // cells L is empty, so we are the leftmost of a signal
input [VMSB2:0] lin,
output [VMSB2:0] lout,
// RIGHT
input [VMSB:0] rempty, // cells D is empty, so we are the rightmost of a signal
input [VMSB2:0] rin,
output [VMSB2:0] rout);
// vertical lines are row order, horizontal lines are column order
// this makes assigning chunks much simpler
// top,right bottom,left
// \/ \/
// ----[]----[]----[]----
// 0 1 2 3 BLOCKHEIGHT+1 vcbit, he, he2, ve, ve2, rst, cclk
//
// ====[]====[]====[]====
// 1,0 3,2 5,4 7,6 (BLOCKHEIGHT+1)*2 hs, hb, vs, vb
wire [HMSB:0] vcbit[BLOCKHEIGHT:0];
wire [HMSB:0] ve[BLOCKHEIGHT:0];
wire [VMSB:0] he[BLOCKWIDTH:0];
wire [HMSB:0] rst[BLOCKHEIGHT:0];
wire [HMSB:0] cclk[BLOCKHEIGHT:0];
wire [HMSB:0] ve2[BLOCKHEIGHT:0];
wire [VMSB:0] he2[BLOCKWIDTH:0];
wire [HMSB2:0] vs[BLOCKHEIGHT:0]; // signal pairs
wire [HMSB2:0] vb[BLOCKHEIGHT:0]; // signal pairs back
wire [VMSB2:0] hs[BLOCKWIDTH:0]; // signal pairs
wire [VMSB2:0] hb[BLOCKWIDTH:0]; // signal pairs back
genvar x;
genvar y;
// column BLOCKWIDTH is leftmost, 0 is rightmost
// row 0 is the topmost, BLOCKHEIGHT is bottommost
generate
for (x = 0 ; x < BLOCKWIDTH ; x = x + 1) begin : column
for (y = 0 ; y < BLOCKHEIGHT ; y = y + 1) begin : row
ycell yc (.reset(rst[y][x]), .reseto(rst[y+1][x]),
.confclk(cclk[y][x]), .confclko(cclk[y+1][x]),
// cbitin, cbitout,
.cbitin(vcbit[y][x]), .cbitout(vcbit[y+1][x]),
// hempty, vempty, (R, U)
.hempty(he2[x+1][y]), .vempty(ve2[y][x]),
// hempty2, vempty2, (L, D)
.hempty2(he[x][y]), .vempty2(ve[y+1][x]),
// uempty, uin, uout,
.uempty(ve[y][x]),
.uin(vs[y][2*x+1:2*x]),
.uout(vb[y][2*x+1:2*x]),
// dempty, din, dout,
.dempty(ve2[y+1][x]),
.din(vb[y+1][2*x+1:2*x]),
.dout(vs[y+1][2*x+1:2*x]),
// lempty, lin, lout,
.lempty(he[x+1][y]),
.lin(hs[x+1][2*y+1:2*y]),
.lout(hb[x+1][2*y+1:2*y]),
// rempty, rin, rout
.rempty(he2[x][y]),
.rin(hb[x][2*y+1:2*y]),
.rout(hs[x][2*y+1:2*y])
);
end
end
endgenerate
// he[2]---l[1]h2--he[1]----l[0]h2---he[0]
// he2[2]--h[1]r---he2[1]---h[0]r----he2[0]
// the ends of the arrays of wire go to the outside
assign rst[0] = {BLOCKWIDTH{reset}};
assign cclk[0] = {BLOCKWIDTH{confclk}};
assign vcbit[0] = cbitin;
assign cbitout = vcbit[BLOCKHEIGHT];
// UP
assign ve[0] = uempty;
assign uvempty = ve2[0];
assign vs[0] = uin;
assign uout = vb[0];
// DOWN
assign ve2[BLOCKHEIGHT] = dempty;
assign dvempty = ve[BLOCKHEIGHT];
assign vb[BLOCKHEIGHT] = din;
assign dout = vs[BLOCKHEIGHT];
// RIGHT
assign he2[0] = rempty;
assign rhempty = he[0];
assign hb[0] = rin;
assign rout = hs[0];
// LEFT
assign he[BLOCKWIDTH] = lempty;
assign lhempty = he2[BLOCKWIDTH];
assign hs[BLOCKWIDTH] = lin;
assign lout = hb[BLOCKWIDTH];
endmodule