| Line 67... |
Line 67... |
lut_ram_dout_rdy_nxt_i, // LUT-RAM data output ready during next cycle
|
lut_ram_dout_rdy_nxt_i, // LUT-RAM data output ready during next cycle
|
`endif
|
`endif
|
|
|
refresh_active_i, // Display refresh on going
|
refresh_active_i, // Display refresh on going
|
refresh_data_request_i, // Request for next refresh data
|
refresh_data_request_i, // Request for next refresh data
|
refresh_lut_select_i // Refresh LUT bank selection
|
|
|
hw_lut_palette_sel_i, // Hardware LUT palette configuration
|
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hw_lut_bgcolor_i, // Hardware LUT background-color selection
|
|
hw_lut_fgcolor_i, // Hardware LUT foreground-color selection
|
|
sw_lut_enable_i, // Refresh LUT-RAM enable
|
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sw_lut_bank_select_i // Refresh LUT-RAM bank selection
|
);
|
);
|
|
|
// OUTPUTs
|
// OUTPUTs
|
//=========
|
//=========
|
output frame_data_request_o; // Request for next frame data
|
output frame_data_request_o; // Request for next frame data
|
| Line 99... |
Line 104... |
input lut_ram_dout_rdy_nxt_i; // LUT-RAM data output ready during next cycle
|
input lut_ram_dout_rdy_nxt_i; // LUT-RAM data output ready during next cycle
|
`endif
|
`endif
|
|
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input refresh_active_i; // Display refresh on going
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input refresh_active_i; // Display refresh on going
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input refresh_data_request_i; // Request for next refresh data
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input refresh_data_request_i; // Request for next refresh data
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input [1:0] refresh_lut_select_i; // Refresh LUT bank selection
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|
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input [2:0] hw_lut_palette_sel_i; // Hardware LUT palette configuration
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input [3:0] hw_lut_bgcolor_i; // Hardware LUT background-color selection
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input [3:0] hw_lut_fgcolor_i; // Hardware LUT foreground-color selection
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input sw_lut_enable_i; // Refresh LUT-RAM enable
|
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input sw_lut_bank_select_i; // Refresh LUT-RAM bank selection
|
|
|
|
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//=============================================================================
|
//=============================================================================
|
// 1) WIRE, REGISTERS AND PARAMETER DECLARATION
|
// 1) WIRE, REGISTERS AND PARAMETER DECLARATION
|
//=============================================================================
|
//=============================================================================
|
| Line 137... |
Line 147... |
|
|
//============================================================================
|
//============================================================================
|
// 2) HARD CODED LOOKUP TABLE
|
// 2) HARD CODED LOOKUP TABLE
|
//============================================================================
|
//============================================================================
|
|
|
wire [15:0] lut_hw_data_1_bpp = ({5'b00000, 6'b000000, 5'b00000} & {16{frame_data_i[0] ==1'b0 }}) | // 1 bpp: Black
|
// 16 full CGA color selection
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({5'b11111, 6'b111111, 5'b11111} & {16{frame_data_i[0] ==1'b1 }}) ; // White
|
parameter [3:0] CGA_BLACK = 4'h0,
|
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CGA_BLUE = 4'h1,
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wire [15:0] lut_hw_data_2_bpp = ({5'b00000, 6'b000000, 5'b00000} & {16{frame_data_i[1:0]==2'b00 }}) | // 2 bpp: Black
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CGA_GREEN = 4'h2,
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({5'b01000, 6'b010000, 5'b01000} & {16{frame_data_i[1:0]==2'b01 }}) | // Dark Gray
|
CGA_CYAN = 4'h3,
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({5'b11000, 6'b110000, 5'b11000} & {16{frame_data_i[1:0]==2'b10 }}) | // Light Gray
|
CGA_RED = 4'h4,
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({5'b11111, 6'b111111, 5'b11111} & {16{frame_data_i[1:0]==2'b11 }}) ; // White
|
CGA_MAGENTA = 4'h5,
|
|
CGA_BROWN = 4'h6,
|
wire [15:0] lut_hw_data_4_bpp = ({5'b00000, 6'b000000, 5'b00000} & {16{frame_data_i[3:0]==4'b0000}}) | // 4 bpp: Black
|
CGA_LIGHT_GRAY = 4'h7,
|
({5'b00000, 6'b000000, 5'b10000} & {16{frame_data_i[3:0]==4'b0001}}) | // Dark Blue
|
CGA_GRAY = 4'h8,
|
({5'b10000, 6'b000000, 5'b00000} & {16{frame_data_i[3:0]==4'b0010}}) | // Dark Red
|
CGA_LIGHT_BLUE = 4'h9,
|
({5'b10000, 6'b000000, 5'b10000} & {16{frame_data_i[3:0]==4'b0011}}) | // Dark Magenta
|
CGA_LIGHT_GREEN = 4'hA,
|
({5'b00000, 6'b100000, 5'b00000} & {16{frame_data_i[3:0]==4'b0100}}) | // Dark Green
|
CGA_LIGHT_CYAN = 4'hB,
|
({5'b00000, 6'b100000, 5'b10000} & {16{frame_data_i[3:0]==4'b0101}}) | // Dark Cyan
|
CGA_LIGHT_RED = 4'hC,
|
({5'b10000, 6'b100000, 5'b00000} & {16{frame_data_i[3:0]==4'b0110}}) | // Dark Yellow
|
CGA_LIGHT_MAGENTA = 4'hD,
|
({5'b10000, 6'b100000, 5'b10000} & {16{frame_data_i[3:0]==4'b0111}}) | // Gray
|
CGA_YELLOW = 4'hE,
|
({5'b00000, 6'b000000, 5'b00000} & {16{frame_data_i[3:0]==4'b1000}}) | // Black
|
CGA_WHITE = 4'hF;
|
({5'b00000, 6'b000000, 5'b11111} & {16{frame_data_i[3:0]==4'b1001}}) | // Blue
|
|
({5'b11111, 6'b000000, 5'b00000} & {16{frame_data_i[3:0]==4'b1010}}) | // Red
|
// Decode CGA 4 color mode (2bpp)
|
({5'b11111, 6'b000000, 5'b11111} & {16{frame_data_i[3:0]==4'b1011}}) | // Magenta
|
wire cga_palette0_hi = (hw_lut_palette_sel_i==3'h0);
|
({5'b00000, 6'b111111, 5'b00000} & {16{frame_data_i[3:0]==4'b1100}}) | // Green
|
wire cga_palette0_lo = (hw_lut_palette_sel_i==3'h1);
|
({5'b00000, 6'b111111, 5'b11111} & {16{frame_data_i[3:0]==4'b1101}}) | // Cyan
|
wire cga_palette1_hi = (hw_lut_palette_sel_i==3'h2);
|
({5'b11111, 6'b111111, 5'b00000} & {16{frame_data_i[3:0]==4'b1110}}) | // Yellow
|
wire cga_palette1_lo = (hw_lut_palette_sel_i==3'h3);
|
({5'b11111, 6'b111111, 5'b11111} & {16{frame_data_i[3:0]==4'b1111}}); // White
|
wire cga_palette2_hi = (hw_lut_palette_sel_i==3'h4);
|
|
wire cga_palette2_lo = (hw_lut_palette_sel_i==3'h5) | (hw_lut_palette_sel_i==3'h6) | (hw_lut_palette_sel_i==3'h7);
|
|
|
|
// LUT color decoding
|
|
// 1 BPP
|
|
wire [3:0] lut_hw_sel_1bpp = ({4{gfx_mode_1_bpp & (frame_data_i[0] ==1'b0 )}} & hw_lut_bgcolor_i ) | // 1 bpp: Black (default bgcolor)
|
|
({4{gfx_mode_1_bpp & (frame_data_i[0] ==1'b1 )}} & hw_lut_fgcolor_i ) ; // White (default fgcolor)
|
|
|
|
// 2 BPP (Palette #0, low-intensity)
|
|
wire [3:0] lut_hw_sel_2bpp = ({4{gfx_mode_2_bpp & cga_palette0_lo & (frame_data_i[1:0]==2'b00)}} & hw_lut_bgcolor_i ) | // 2 bpp: Black (default bgcolor)
|
|
({4{gfx_mode_2_bpp & cga_palette0_lo & (frame_data_i[1:0]==2'b01)}} & CGA_GREEN ) | // Green
|
|
({4{gfx_mode_2_bpp & cga_palette0_lo & (frame_data_i[1:0]==2'b10)}} & CGA_RED ) | // Red
|
|
({4{gfx_mode_2_bpp & cga_palette0_lo & (frame_data_i[1:0]==2'b11)}} & CGA_BROWN ) | // Brown
|
|
|
|
// 2 BPP (Palette #0, high-intensity)
|
|
({4{gfx_mode_2_bpp & cga_palette0_hi & (frame_data_i[1:0]==2'b00)}} & hw_lut_bgcolor_i ) | // 2 bpp: Black (default bgcolor)
|
|
({4{gfx_mode_2_bpp & cga_palette0_hi & (frame_data_i[1:0]==2'b01)}} & CGA_LIGHT_GREEN ) | // Light-Green
|
|
({4{gfx_mode_2_bpp & cga_palette0_hi & (frame_data_i[1:0]==2'b10)}} & CGA_LIGHT_RED ) | // Light-Red
|
|
({4{gfx_mode_2_bpp & cga_palette0_hi & (frame_data_i[1:0]==2'b11)}} & CGA_YELLOW ) | // Yellow
|
|
|
|
// 2 BPP (Palette #1, low-intensity)
|
|
({4{gfx_mode_2_bpp & cga_palette1_lo & (frame_data_i[1:0]==2'b00)}} & hw_lut_bgcolor_i ) | // 2 bpp: Black (default bgcolor)
|
|
({4{gfx_mode_2_bpp & cga_palette1_lo & (frame_data_i[1:0]==2'b01)}} & CGA_CYAN ) | // Cyan
|
|
({4{gfx_mode_2_bpp & cga_palette1_lo & (frame_data_i[1:0]==2'b10)}} & CGA_MAGENTA ) | // Magenta
|
|
({4{gfx_mode_2_bpp & cga_palette1_lo & (frame_data_i[1:0]==2'b11)}} & CGA_LIGHT_GRAY ) | // Light-Gray
|
|
|
|
// 2 BPP (Palette #1, high-intensity)
|
|
({4{gfx_mode_2_bpp & cga_palette1_hi & (frame_data_i[1:0]==2'b00)}} & hw_lut_bgcolor_i ) | // 2 bpp: Black (default bgcolor)
|
|
({4{gfx_mode_2_bpp & cga_palette1_hi & (frame_data_i[1:0]==2'b01)}} & CGA_LIGHT_CYAN ) | // Light-Cyan
|
|
({4{gfx_mode_2_bpp & cga_palette1_hi & (frame_data_i[1:0]==2'b10)}} & CGA_LIGHT_MAGENTA) | // Light-Magenta
|
|
({4{gfx_mode_2_bpp & cga_palette1_hi & (frame_data_i[1:0]==2'b11)}} & CGA_WHITE ) | // White
|
|
|
|
// 2 BPP (Palette #2, low-intensity)
|
|
({4{gfx_mode_2_bpp & cga_palette2_lo & (frame_data_i[1:0]==2'b00)}} & hw_lut_bgcolor_i ) | // 2 bpp: Black (default bgcolor)
|
|
({4{gfx_mode_2_bpp & cga_palette2_lo & (frame_data_i[1:0]==2'b01)}} & CGA_CYAN ) | // Cyan
|
|
({4{gfx_mode_2_bpp & cga_palette2_lo & (frame_data_i[1:0]==2'b10)}} & CGA_RED ) | // Red
|
|
({4{gfx_mode_2_bpp & cga_palette2_lo & (frame_data_i[1:0]==2'b11)}} & CGA_LIGHT_GRAY ) | // Light-Gray
|
|
|
|
// 2 BPP (Palette #2, high-intensity)
|
|
({4{gfx_mode_2_bpp & cga_palette2_hi & (frame_data_i[1:0]==2'b00)}} & hw_lut_bgcolor_i ) | // 2 bpp: Black (default bgcolor)
|
|
({4{gfx_mode_2_bpp & cga_palette2_hi & (frame_data_i[1:0]==2'b01)}} & CGA_LIGHT_CYAN ) | // Light-Cyan
|
|
({4{gfx_mode_2_bpp & cga_palette2_hi & (frame_data_i[1:0]==2'b10)}} & CGA_LIGHT_RED ) | // Light-Red
|
|
({4{gfx_mode_2_bpp & cga_palette2_hi & (frame_data_i[1:0]==2'b11)}} & CGA_WHITE ) ; // White
|
|
|
|
// 4 BPP (full CGA 16-color palette)
|
|
wire [3:0] lut_hw_sel_4bpp = ({4{gfx_mode_4_bpp}} & frame_data_i[3:0]);
|
|
|
|
wire [3:0] lut_hw_color_sel = lut_hw_sel_4bpp | lut_hw_sel_2bpp | lut_hw_sel_1bpp;
|
|
|
|
// Color encoding for 1-bit / 2-bit and 4-bit modes
|
|
reg [15:0] lut_hw_data_1_2_4_bpp;
|
|
always @(lut_hw_color_sel)
|
|
case(lut_hw_color_sel)
|
|
CGA_BLACK : lut_hw_data_1_2_4_bpp = {5'b00000, 6'b000000, 5'b00000}; // Black
|
|
CGA_BLUE : lut_hw_data_1_2_4_bpp = {5'b00000, 6'b000000, 5'b10101}; // Blue
|
|
CGA_GREEN : lut_hw_data_1_2_4_bpp = {5'b00000, 6'b101011, 5'b00000}; // Green
|
|
CGA_CYAN : lut_hw_data_1_2_4_bpp = {5'b00000, 6'b101011, 5'b10101}; // Cyan
|
|
CGA_RED : lut_hw_data_1_2_4_bpp = {5'b10101, 6'b000000, 5'b00000}; // Red
|
|
CGA_MAGENTA : lut_hw_data_1_2_4_bpp = {5'b10101, 6'b000000, 5'b10101}; // Magenta
|
|
CGA_BROWN : lut_hw_data_1_2_4_bpp = {5'b10101, 6'b010101, 5'b00000}; // Brown
|
|
CGA_LIGHT_GRAY : lut_hw_data_1_2_4_bpp = {5'b10101, 6'b101011, 5'b10101}; // Light Gray
|
|
CGA_GRAY : lut_hw_data_1_2_4_bpp = {5'b01011, 6'b010101, 5'b01011}; // Gray
|
|
CGA_LIGHT_BLUE : lut_hw_data_1_2_4_bpp = {5'b01011, 6'b010101, 5'b11111}; // Light Blue
|
|
CGA_LIGHT_GREEN : lut_hw_data_1_2_4_bpp = {5'b01011, 6'b111111, 5'b01011}; // Light Green
|
|
CGA_LIGHT_CYAN : lut_hw_data_1_2_4_bpp = {5'b01011, 6'b111111, 5'b11111}; // Light Cyan
|
|
CGA_LIGHT_RED : lut_hw_data_1_2_4_bpp = {5'b11111, 6'b010101, 5'b01011}; // Light Red
|
|
CGA_LIGHT_MAGENTA : lut_hw_data_1_2_4_bpp = {5'b11111, 6'b010101, 5'b11111}; // Light Magenta
|
|
CGA_YELLOW : lut_hw_data_1_2_4_bpp = {5'b11111, 6'b111111, 5'b01011}; // Yellow
|
|
CGA_WHITE : lut_hw_data_1_2_4_bpp = {5'b11111, 6'b111111, 5'b11111}; // White
|
|
// pragma coverage off
|
|
default : lut_hw_data_1_2_4_bpp = 16'h0000;
|
|
// pragma coverage on
|
|
endcase
|
|
|
|
// 8-bit truecolor RGB mapping (3-bit red / 3-bit green / 2-bit blue)
|
wire [15:0] lut_hw_data_8_bpp = {frame_data_i[7],frame_data_i[6],frame_data_i[5],frame_data_i[5],frame_data_i[5], // 8 bpp: R = D<7,6,5,5,5>
|
wire [15:0] lut_hw_data_8_bpp = {frame_data_i[7],frame_data_i[6],frame_data_i[5],frame_data_i[5],frame_data_i[5], // 8 bpp: R = D<7,6,5,5,5>
|
frame_data_i[4],frame_data_i[3],frame_data_i[2],frame_data_i[2],frame_data_i[2],frame_data_i[2], // G = D<4,3,2,2,2,2>
|
frame_data_i[4],frame_data_i[3],frame_data_i[2],frame_data_i[2],frame_data_i[2],frame_data_i[2], // G = D<4,3,2,2,2,2>
|
frame_data_i[1],frame_data_i[0],frame_data_i[0],frame_data_i[0],frame_data_i[0]}; // B = D<1,0,0,0,0>
|
frame_data_i[1],frame_data_i[0],frame_data_i[0],frame_data_i[0],frame_data_i[0]}; // B = D<1,0,0,0,0>
|
|
|
wire [15:0] lut_hw_data = (lut_hw_data_1_bpp & {16{gfx_mode_1_bpp}}) |
|
wire [15:0] lut_hw_data = (lut_hw_data_1_2_4_bpp & {16{gfx_mode_1_bpp | gfx_mode_2_bpp | gfx_mode_4_bpp}}) |
|
(lut_hw_data_2_bpp & {16{gfx_mode_2_bpp}}) |
|
|
(lut_hw_data_4_bpp & {16{gfx_mode_4_bpp}}) |
|
|
(lut_hw_data_8_bpp & {16{gfx_mode_8_bpp}});
|
(lut_hw_data_8_bpp & {16{gfx_mode_8_bpp}});
|
|
|
wire lut_hw_enabled = ~gfx_mode_16_bpp & ~refresh_lut_select_i[0];
|
wire lut_hw_enabled = ~gfx_mode_16_bpp & ~sw_lut_enable_i;
|
wire lut_sw_enabled = ~gfx_mode_16_bpp & refresh_lut_select_i[0];
|
wire lut_sw_enabled = ~gfx_mode_16_bpp & sw_lut_enable_i;
|
|
|
|
|
//============================================================================
|
//============================================================================
|
// 3) STATE MACHINE
|
// 3) STATE MACHINE
|
//============================================================================
|
//============================================================================
|
| Line 245... |
Line 326... |
`ifdef WITH_EXTRA_LUT_BANK
|
`ifdef WITH_EXTRA_LUT_BANK
|
// Allow LUT bank switching only when the refresh is not on going
|
// Allow LUT bank switching only when the refresh is not on going
|
reg refresh_lut_bank_select_sync;
|
reg refresh_lut_bank_select_sync;
|
always @(posedge mclk or posedge puc_rst)
|
always @(posedge mclk or posedge puc_rst)
|
if (puc_rst) refresh_lut_bank_select_sync <= 1'b0;
|
if (puc_rst) refresh_lut_bank_select_sync <= 1'b0;
|
else if (~refresh_active_i) refresh_lut_bank_select_sync <= refresh_lut_select_i[1];
|
else if (~refresh_active_i) refresh_lut_bank_select_sync <= sw_lut_bank_select_i;
|
|
|
assign lut_ram_addr_o = {refresh_lut_bank_select_sync, frame_data_i[7:0]} & {9{~lut_ram_cen_o}};
|
assign lut_ram_addr_o = {refresh_lut_bank_select_sync, frame_data_i[7:0]} & {9{~lut_ram_cen_o}};
|
`else
|
`else
|
assign lut_ram_addr_o = frame_data_i[7:0] & {8{~lut_ram_cen_o}};
|
assign lut_ram_addr_o = frame_data_i[7:0] & {8{~lut_ram_cen_o}};
|
`endif
|
`endif
|
