/library/bip/spi_engine: fix delay on set_miso_drive

Signed-off-by: Carlos Souza <carlos.souza@analog.com>

Author: caosjr

library/vip/adi/spi_vip/adi_spi_vip_pkg.sv

@@ -211,7 +211,7 @@ package adi_spi_vip_pkg;
                 // vif.drive_edge has arrived
                 // don't shift at last edge if CPHA=0
                 if (!(vif.get_param_CPHA() == 0 && i == vif.get_param_DATA_DLENGTH()-1)) begin
-                  vif.set_miso_drive_instantaneous(miso_bits_msb);
+                  vif.set_miso_drive(miso_bits_msb);
                 end
 
                 foreach (miso_mbx[j]) begin

library/vip/adi/spi_vip/spi_vip_if.sv

@@ -64,6 +64,7 @@ interface spi_vip_if #(
   spi_mode_t spi_mode;
   logic miso_oen;
   logic [NUM_OF_SDI-1:0] miso_drive;
+  logic [NUM_OF_SDI-1:0] miso_drive_delayed;
   logic [NUM_OF_SDO-1:0] mosi_drive = 1'b0;
   logic cs_drive = 1'b0;
   logic sclk_drive = 1'b0;
@@ -88,7 +89,7 @@ interface spi_vip_if #(
 
   // miso drive handling
   assign s_miso = (spi_mode != SPI_MODE_SLAVE)  ? m_miso
-                : (miso_oen)          ? miso_drive
+                : (miso_oen)          ? miso_drive_delayed
                 /*default*/         : 'z;
 
   // mosi drive handling
@@ -178,14 +179,16 @@ interface spi_vip_if #(
 
     virtual task set_miso_drive(bit val[]);
       foreach (val[i]) begin
-        miso_drive[i] <= #(SLAVE_TOUT) val[i];
+        miso_drive[i] = val[i];
       end
+      miso_drive_delayed <= #(SLAVE_TOUT * 1ns) miso_drive;
     endtask
 
     virtual task set_miso_drive_instantaneous(bit val[]);
       foreach (val[i]) begin
         miso_drive[i] = val[i];
       end
+      miso_drive_delayed <= miso_drive;
     endtask
 
     virtual task wait_cs_active();