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fmcadc3: Add a chip-select decoder to support up to 7 devices 

This is required for the fmcadc3 board as it features 7 chips all
connected to the same SPI bus (ad9528, ad9234 x2, ada4961 x4).

Signed-off-by: Paul Cercueil <paul.cercueil@analog.com>
main
Paul Cercueil 2014-11-11 11:08:25 +01:00
parent 05ed98f884
commit 4ccece5c8d
2 changed files with 24 additions and 18 deletions
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10
projects/fmcadc3/common/fmcadc3_spi.v
View File

@ -39,9 +39,7 @@
module fmcadc3_spi (
ad9528_csn,
ad9234_1_csn,
ad9234_2_csn,
csn,
spi_clk,
spi_mosi,
spi_miso,
@ -50,9 +48,7 @@ module fmcadc3_spi (
// 4 wire
input ad9528_csn;
input ad9234_1_csn;
input ad9234_2_csn;
input [ 6:0] csn;
input spi_clk;
input spi_mosi;
output spi_miso;
@ -74,7 +70,7 @@ module fmcadc3_spi (
// check on rising edge and change on falling edge
assign spi_csn_s = ad9528_csn & ad9234_1_csn & ad9234_2_csn;
assign spi_csn_s = &csn;
assign spi_enable_s = spi_enable & ~spi_csn_s;
always @(posedge spi_clk or posedge spi_csn_s) begin

32
projects/fmcadc3/zc706/system_top.v
View File

@ -239,6 +239,23 @@ module system_top (
wire adc_valid_3;
wire [255:0] gt_data;
wire [ 6:0] csn;
wire [ 2:0] csn_i;
genvar i;
generate for (i = 0; i < 7; i = i + 1) begin
assign csn[i] = ~(csn_i == i);
end endgenerate
assign ad9528_csn = csn[0];
assign ad9234_1_csn = csn[1];
assign ad9234_2_csn = csn[2];
assign ada4961_1a_csn = csn[3];
assign ada4961_1b_csn = csn[4];
assign ada4961_1c_csn = csn[5];
assign ada4961_1d_csn = csn[6];
// adc-pack place holder
always @(posedge adc_clk) begin
@ -416,15 +433,8 @@ module system_top (
.O (rx_sync_1_p),
.OB (rx_sync_1_n));
assign ada4961_1a_csn = 1'b1;
assign ada4961_1b_csn = 1'b1;
assign ada4961_2a_csn = 1'b1;
assign ada4961_2b_csn = 1'b1;
fmcadc3_spi i_spi (
.ad9528_csn (ad9528_csn),
.ad9234_1_csn (ad9234_1_csn),
.ad9234_2_csn (ad9234_2_csn),
.csn (csn),
.spi_clk (spi_clk),
.spi_mosi (spi_mosi),
.spi_miso (spi_miso),
@ -516,9 +526,9 @@ module system_top (
.spdif (spdif),
.spi_clk_i (spi_clk),
.spi_clk_o (spi_clk),
.spi_csn_0 (ad9528_csn),
.spi_csn_1 (ad9234_1_csn),
.spi_csn_2 (ad9234_2_csn),
.spi_csn_0 (csn_i[0]),
.spi_csn_1 (csn_i[1]),
.spi_csn_2 (csn_i[2]),
.spi_csn_i (1'b1),
.spi_sdi_i (spi_miso),
.spi_sdo_i (spi_mosi),