Line data Source code
1 : // Copyright 2020 Western Digital Corporation or its affiliates.
2 : //
3 : // Licensed under the Apache License, Version 2.0 (the "License");
4 : // you may not use this file except in compliance with the License.
5 : // You may obtain a copy of the License at
6 : //
7 : // http://www.apache.org/licenses/LICENSE-2.0
8 : //
9 : // Unless required by applicable law or agreed to in writing, software
10 : // distributed under the License is distributed on an "AS IS" BASIS,
11 : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 : // See the License for the specific language governing permissions and
13 : // limitations under the License.
14 :
15 : //********************************************************************************
16 : // $Id$
17 : //
18 : //
19 : // Owner:
20 : // Function: Clock Generation Block
21 : // Comments: All the clocks are generate here
22 : //
23 : // //********************************************************************************
24 :
25 :
26 : module el2_lsu_clkdomain
27 : import el2_pkg::*;
28 : #(
29 : `include "el2_param.vh"
30 : )(
31 69840565 : input logic clk, // Clock only while core active. Through one clock header. For flops with second clock header built in. Connected to ACTIVE_L2CLK.
32 69840565 : input logic active_clk, // Clock only while core active. Through two clock headers. For flops without second clock header built in.
33 338 : input logic rst_l, // reset, active low
34 0 : input logic dec_tlu_force_halt, // This will be high till TLU goes to debug halt
35 :
36 : // Inputs
37 2 : input logic clk_override, // chciken bit to turn off clock gating
38 0 : input logic dma_dccm_req, // dma is active
39 258932 : input logic ldst_stbuf_reqvld_r, // allocating in to the store queue
40 :
41 258448 : input logic stbuf_reqvld_any, // stbuf is draining
42 0 : input logic stbuf_reqvld_flushed_any, // instruction going to stbuf is flushed
43 1665222 : input logic lsu_busreq_r, // busreq in r
44 814960 : input logic lsu_bus_buffer_pend_any, // bus buffer has a pending bus entry
45 1193711 : input logic lsu_bus_buffer_empty_any, // external bus buffer is empty
46 258787 : input logic lsu_stbuf_empty_any, // stbuf is empty
47 :
48 338 : input logic lsu_bus_clk_en, // bus clock enable
49 :
50 623587 : input el2_lsu_pkt_t lsu_p, // lsu packet in decode
51 477872 : input el2_lsu_pkt_t lsu_pkt_d, // lsu packet in d
52 477824 : input el2_lsu_pkt_t lsu_pkt_m, // lsu packet in m
53 477821 : input el2_lsu_pkt_t lsu_pkt_r, // lsu packet in r
54 :
55 : // Outputs
56 2048772 : output logic lsu_bus_obuf_c1_clken, // obuf clock enable
57 1087248 : output logic lsu_busm_clken, // bus clock enable
58 :
59 69840565 : output logic lsu_c1_m_clk, // m pipe single pulse clock
60 69840565 : output logic lsu_c1_r_clk, // r pipe single pulse clock
61 :
62 69840565 : output logic lsu_c2_m_clk, // m pipe double pulse clock
63 69840565 : output logic lsu_c2_r_clk, // r pipe double pulse clock
64 :
65 69840565 : output logic lsu_store_c1_m_clk, // store in m
66 69840565 : output logic lsu_store_c1_r_clk, // store in r
67 :
68 69840565 : output logic lsu_stbuf_c1_clk,
69 0 : output logic lsu_bus_obuf_c1_clk, // ibuf clock
70 69840565 : output logic lsu_bus_ibuf_c1_clk, // ibuf clock
71 69840565 : output logic lsu_bus_buf_c1_clk, // ibuf clock
72 0 : output logic lsu_busm_clk, // bus clock
73 :
74 69840565 : output logic lsu_free_c2_clk, // free double pulse clock
75 :
76 : // Excluding scan_mode from coverage as its usage is determined by the integrator of the VeeR core.
77 : /*verilator coverage_off*/
78 : input logic scan_mode // Scan mode
79 : /*verilator coverage_on*/
80 : );
81 :
82 2285334 : logic lsu_c1_m_clken, lsu_c1_r_clken;
83 2040074 : logic lsu_c2_m_clken, lsu_c2_r_clken;
84 2285308 : logic lsu_c1_m_clken_q, lsu_c1_r_clken_q;
85 1071818 : logic lsu_store_c1_m_clken, lsu_store_c1_r_clken;
86 :
87 :
88 200948 : logic lsu_stbuf_c1_clken;
89 1087248 : logic lsu_bus_ibuf_c1_clken, lsu_bus_buf_c1_clken;
90 :
91 855068 : logic lsu_free_c1_clken, lsu_free_c1_clken_q, lsu_free_c2_clken;
92 :
93 : //-------------------------------------------------------------------------------------------
94 : // Clock Enable logic
95 : //-------------------------------------------------------------------------------------------
96 :
97 : assign lsu_c1_m_clken = lsu_p.valid | dma_dccm_req | clk_override;
98 : assign lsu_c1_r_clken = lsu_pkt_m.valid | lsu_c1_m_clken_q | clk_override;
99 :
100 : assign lsu_c2_m_clken = lsu_c1_m_clken | lsu_c1_m_clken_q | clk_override;
101 : assign lsu_c2_r_clken = lsu_c1_r_clken | lsu_c1_r_clken_q | clk_override;
102 :
103 : assign lsu_store_c1_m_clken = ((lsu_c1_m_clken & lsu_pkt_d.store) | clk_override) ;
104 : assign lsu_store_c1_r_clken = ((lsu_c1_r_clken & lsu_pkt_m.store) | clk_override) ;
105 :
106 : assign lsu_stbuf_c1_clken = ldst_stbuf_reqvld_r | stbuf_reqvld_any | stbuf_reqvld_flushed_any | clk_override;
107 : assign lsu_bus_ibuf_c1_clken = lsu_busreq_r | clk_override;
108 : assign lsu_bus_obuf_c1_clken = (lsu_bus_buffer_pend_any | lsu_busreq_r | clk_override) & lsu_bus_clk_en;
109 : assign lsu_bus_buf_c1_clken = ~lsu_bus_buffer_empty_any | lsu_busreq_r | dec_tlu_force_halt | clk_override;
110 :
111 : assign lsu_free_c1_clken = (lsu_p.valid | lsu_pkt_d.valid | lsu_pkt_m.valid | lsu_pkt_r.valid) |
112 : ~lsu_bus_buffer_empty_any | ~lsu_stbuf_empty_any | clk_override;
113 : assign lsu_free_c2_clken = lsu_free_c1_clken | lsu_free_c1_clken_q | clk_override;
114 :
115 : // Flops
116 : rvdff #(1) lsu_free_c1_clkenff (.din(lsu_free_c1_clken), .dout(lsu_free_c1_clken_q), .clk(active_clk), .*);
117 :
118 : rvdff #(1) lsu_c1_m_clkenff (.din(lsu_c1_m_clken), .dout(lsu_c1_m_clken_q), .clk(lsu_free_c2_clk), .*);
119 : rvdff #(1) lsu_c1_r_clkenff (.din(lsu_c1_r_clken), .dout(lsu_c1_r_clken_q), .clk(lsu_free_c2_clk), .*);
120 :
121 : // Clock Headers
122 : rvoclkhdr lsu_c1m_cgc ( .en(lsu_c1_m_clken), .l1clk(lsu_c1_m_clk), .* );
123 : rvoclkhdr lsu_c1r_cgc ( .en(lsu_c1_r_clken), .l1clk(lsu_c1_r_clk), .* );
124 :
125 : rvoclkhdr lsu_c2m_cgc ( .en(lsu_c2_m_clken), .l1clk(lsu_c2_m_clk), .* );
126 : rvoclkhdr lsu_c2r_cgc ( .en(lsu_c2_r_clken), .l1clk(lsu_c2_r_clk), .* );
127 :
128 : rvoclkhdr lsu_store_c1m_cgc (.en(lsu_store_c1_m_clken), .l1clk(lsu_store_c1_m_clk), .*);
129 : rvoclkhdr lsu_store_c1r_cgc (.en(lsu_store_c1_r_clken), .l1clk(lsu_store_c1_r_clk), .*);
130 :
131 : rvoclkhdr lsu_stbuf_c1_cgc ( .en(lsu_stbuf_c1_clken), .l1clk(lsu_stbuf_c1_clk), .* );
132 : rvoclkhdr lsu_bus_ibuf_c1_cgc ( .en(lsu_bus_ibuf_c1_clken), .l1clk(lsu_bus_ibuf_c1_clk), .* );
133 : rvoclkhdr lsu_bus_buf_c1_cgc ( .en(lsu_bus_buf_c1_clken), .l1clk(lsu_bus_buf_c1_clk), .* );
134 :
135 : assign lsu_busm_clken = (~lsu_bus_buffer_empty_any | lsu_busreq_r | clk_override) & lsu_bus_clk_en;
136 :
137 : `ifdef RV_FPGA_OPTIMIZE
138 : assign lsu_busm_clk = 1'b0;
139 : assign lsu_bus_obuf_c1_clk = 1'b0;
140 : `else
141 : rvclkhdr lsu_bus_obuf_c1_cgc ( .en(lsu_bus_obuf_c1_clken), .l1clk(lsu_bus_obuf_c1_clk), .* );
142 : rvclkhdr lsu_busm_cgc (.en(lsu_busm_clken), .l1clk(lsu_busm_clk), .*);
143 : `endif
144 :
145 : rvoclkhdr lsu_free_cgc (.en(lsu_free_c2_clken), .l1clk(lsu_free_c2_clk), .*);
146 :
147 : endmodule
148 :
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