Entity: sysrst_ctrl_keyfsm

• File: sysrst_ctrl_keyfsm.sv

Diagram

Description

Generics

Generic name	Type	Value	Description
TimerWidth	int unsigned	16

Ports

Port name	Direction	Type	Description
clk_i	input
rst_ni	input
trigger_i	input
cfg_timer_i	input	[TimerWidth-1:0]
cfg_l2h_en_i	input
cfg_h2l_en_i	input
timer_l2h_cond_met_o	output
timer_h2l_cond_met_o	output

Signals

Name	Type	Description
trigger_q	logic
trigger_h2l	logic
trigger_l2h	logic
trigger_l2l	logic
trigger_h2h	logic
timer_cnt_d	logic [TimerWidth-1:0]	logic trigger_tgl, trigger_sty;
timer_cnt_q	logic [TimerWidth-1:0]	logic trigger_tgl, trigger_sty;
timer_cnt_clr	logic
timer_cnt_en	logic
timer_state_q	timer_state_e
timer_state_d	timer_state_e

Types

Name	Type	Description
timer_state_e	enum logic [2:0] { IDLE = 3'h0, WAITL2H = 3'h1, WAITH2L = 3'h2, DONEL2H = 3'h3, DONEH2L = 3'h4 }	assign trigger_tgl = trigger_q != trigger_i; assign trigger_sty = trigger_q == trigger_i; five-state FSM IDLE->WAITH2L->DONEH2L->WAITL2H->DONEL2H or IDLE->WAITL2H->DONEL2H->WAITH2L->DONEH2L The inputs can be inverted, hence two possible paths When a key or button is pressed, the non-inverted input signal goes from high to low. When a key or button is released, the non-inverted input signal goes from low to high. FSM will be able to detect a key or button being pressed then releaseed in one complete path

Processes

• p_trigger_reg: ( @(posedge clk_i or negedge rst_ni) )

• p_timer_state_reg: ( @(posedge clk_i or negedge rst_ni) )

• p_timer_cnt_reg: ( @(posedge clk_i or negedge rst_ni) )

• timer_fsm: ( )