Initial commit of OpenSPARC T2 design and verification files.

[OpenSPARC-T2-DV] / verif / env / common / verilog / checkers / ncu / ncu_tcu_chkr.v

// ========== Copyright Header Begin ==========================================
// 
// OpenSPARC T2 Processor File: ncu_tcu_chkr.v
// Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved
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// ========== Copyright Header End ============================================
module ncu_tcu_chkr();

wire por_reset_l = !`NCU.tcu_aclk;

// 0in set_clock  -default   iol2clk   -module ncu

// 0in default_reset `NCU.tcu_aclk -module ncu_tcu_chkr

`ifdef X_GUARD
// 0in known_driven -var ncu_tcu_stall   -name ncu_tcu_stall_x_guard -active por_reset_l -module ncu
// 0in known_driven -var tcu_ncu_vld     -name tcu_ncu_vld_x_guard   -active por_reset_l -module ncu
// 0in known_driven -var tcu_ncu_stall   -name tcu_ncu_stall_x_guard -active por_reset_l -module ncu
// 0in known_driven -var ncu_tcu_vld     -name ncu_tcu_vld_x_guard   -active por_reset_l -module ncu
`endif


//*********************************
// make sure vald and stall do not active to long  
//*********************************

reg [9:0] tcu_ncu_vld_cnt;
reg [9:0] tcu_ncu_stall_cnt;
reg [9:0] ncu_tcu_vld_cnt;
reg [9:0] ncu_tcu_stall_cnt;

/* 0in range
       -var tcu_ncu_vld_cnt
       -min 0 
       -max 16
       -clock `NCU.iol2clk
*/

/* 0in range
       -var tcu_ncu_stall_cnt
       -min 0 
       -max 1000
       -clock `NCU.iol2clk
*/

/* 0in range
       -var ncu_tcu_vld_cnt
       -min 0 
       -max 16
       -clock `NCU.iol2clk
*/

/* 0in range
       -var ncu_tcu_stall_cnt
       -min 0 
       -max 1000
       -clock `NCU.iol2clk

*/


reg tcu_ncu_stall_del ;
reg ncu_tcu_stall_del ;

always @(posedge `NCU.iol2clk) begin
 if (`NCU.tcu_ncu_vld && !ncu_tcu_stall_del) begin
       tcu_ncu_vld_cnt = tcu_ncu_vld_cnt + 1;
 end
 else if (!`NCU.tcu_ncu_vld) begin
       tcu_ncu_vld_cnt = 0;
 end

 if (tcu_ncu_stall_del) begin
       tcu_ncu_stall_cnt = tcu_ncu_stall_cnt + 1;
 end 
 else begin
       tcu_ncu_stall_cnt = 0; 
 end


 if (`NCU.ncu_tcu_vld && !tcu_ncu_stall_del) begin 
       ncu_tcu_vld_cnt = ncu_tcu_vld_cnt + 1;
 end
 else if (!`NCU.ncu_tcu_vld) begin
       ncu_tcu_vld_cnt = 0;
 end

 if (ncu_tcu_stall_del) begin 
        ncu_tcu_stall_cnt = ncu_tcu_stall_cnt + 1;
 end 
 else begin
       ncu_tcu_stall_cnt = 0;
 end

 tcu_ncu_stall_del = `NCU.tcu_ncu_stall;
 ncu_tcu_stall_del = `NCU.ncu_tcu_stall;

end




endmodule