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签到天数: 110 天 [LV.6]常住居民II
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always @(posedge dri_clk or negedge rst_n) begin& ?* }0 Q2 x: J
if(!rst_n) begin1 [8 u7 C+ r) g+ s- q
cnt <= 5'd0;1 t) h8 }2 `# u3 a, ]: q
op_code <= 1'b0;
' k$ B( j, l& U" U1 L. ?* q6 ^! s addr_t <= 1'b0;1 G' t1 m! C. [& z% M+ `4 m
wr_data_t <= 1'b0;
% C& K1 E8 I8 o( t5 U rd_data_t <= 1'b0;
" y" q+ n% Y7 n: m! n2 @0 g( Z op_done <= 1'b0;1 x9 l5 a3 W" K- n
st_done <= 1'b0;
: E5 b1 F, S; H* A, ?6 z4 | op_rd_data <= 1'b0;
6 q0 L6 {1 |! @, V- E op_rd_ack <= 1'b1;, ^' d, X! I) y
mdio_dir <= 1'b0;
1 e- w. d% w7 V R8 g4 C2 W+ @ mdio_out <= 1'b1;
6 Y4 t( f: \9 [ end6 ^3 A6 r$ z- C! c1 v( z9 G) M
else begin
( S0 P1 G1 A1 [. W* @ st_done <= 1'b0 ; ( d) c5 V0 t3 j4 i) h: m. B$ k
cnt <= cnt +1'b1 ; 8 `' R: K# ?" N& G+ l( @
case(cur_state)
9 E+ S, W9 R, D* A& o; X) \9 i st_idle : begin
( }' H5 q# t) [: [* B v$ x; ` mdio_out <= 1'b1;
0 y. Q% e& u3 z5 m mdio_dir <= 1'b0; / J6 w$ X3 G0 ~) O
op_done <= 1'b0; % L% F" X2 R5 F) c3 o4 ^$ h) {
cnt <= 7'b0;
) z+ q/ w$ y# |. L) e; e if(op_exec) begin
' D! z! Z9 K# L+ Y- c8 ?: I op_code <= {op_rh_wl,~op_rh_wl}; //OP_CODE: 2'b01(写) 2'b10(读) ( H+ p6 L& M0 _3 x% x. r8 x" J
addr_t <= op_addr;/ n Z2 ~$ l+ H) P9 C1 ~
wr_data_t <= op_wr_data;* E2 l$ k+ |5 u! N
op_rd_ack <= 1'b1;
7 z g1 I! g* | end
# R" t) z. Y; y( q j end
$ D+ n1 H( q. i( G& a2 o
2 I9 l$ X" C6 N* O时钟沿来时,如果状态是st_idle 时,cnt到底是执行cnt <= cnt +1'b1 还是 cnt <= 7'b05 `! N$ O# j) Z, g. g' Y' \
) K3 K( `, L5 u
+ q( `" U# v* P* N/ @+ k |
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