Architecture rtl of sdram_ctrl_fsm

Types

Name	Description
FSM_TYPE	FSM
SD_CMD_TYPE	SDRAM Commands
SD_A_SEL_TYPE
SD_BA_SEL_TYPE

Functions

virtual function positive

burst_clock_cycles()

length of burst in clock cycles of "clk"

Processes

process

process @(clk)

Registers

FSM Transitions for fsm_cs

#	Current State	Next State	Condition	Comment
1	INIT1	INIT2	[EMPTY]
2	INIT2	INIT3	[((timer_tREFI_done = '1') and (downcnt_done = '1'))]
3	INIT3	INIT4	[EMPTY]
4	INIT4	INIT5	[(SDRAM_TYPE >= 1)]
5	INIT4	INIT8	[not (SDRAM_TYPE >= 1)]
6	INIT5	INIT6	[(timer_cmd_done = '1')]
7	INIT8	INIT9	[(timer_cmd_done = '1')]
8	INIT6	INIT7	[(timer_cmd_done = '1')]
9	INIT9	INIT10	[(timer_cmd_done = '1')]
10	INIT7	INIT8	[(timer_cmd_done = '1')]
11	INIT10	INIT11	[(timer_cmd_done = '1' and timer_tREFI_done = '1')]
12	INIT11	DO_ACTIVATE	[(timer_cmd_done = '1')]
13	DO_ACTIVATE	DO_WRITE1	[((timer_cmd_done = '1') and (user_cmd_valid = '1') and (user_write = '1'))]
14	DO_ACTIVATE	DO_READ1	[((timer_cmd_done = '1') and (user_cmd_valid = '1') and not (user_write = '1'))]
15	DO_WRITE1	CHECKNXT	[((timer_cmd_done and user_wdata_valid = '1') and (SDRAM_TYPE = 0 and BL = 1 or SDRAM_TYPE > 0 and BL = 2))]
16	DO_WRITE1	DO_WRITE2	[((timer_cmd_done and user_wdata_valid = '1') and not (SDRAM_TYPE = 0 and BL = 1 or SDRAM_TYPE > 0 and BL = 2))]
17	DO_READ1	CHECKNXT	[((timer_cmd_done = '1') and (SDRAM_TYPE = 0 and BL = 1 or SDRAM_TYPE > 0 and BL = 2))]
18	DO_READ1	DO_READ2	[((timer_cmd_done = '1') and not (SDRAM_TYPE = 0 and BL = 1 or SDRAM_TYPE > 0 and BL = 2))]
19	CHECKNXT	DO_PRECHARGE	[((timer_tREFI_done = '1') and (timer_tRAS_done = '1')), (not (timer_tREFI_done = '1') and not (user_cmd_valid and same_bank_row = '1') and (timer_cmd_done = '1') and (timer_tRAS_done = '1'))]
20	CHECKNXT	DO_WRITE1	[(not (timer_tREFI_done = '1') and (user_cmd_valid and same_bank_row = '1') and (user_write = '1'))]
21	CHECKNXT	DO_READ1	[(not (timer_tREFI_done = '1') and (user_cmd_valid and same_bank_row = '1') and not (user_write = '1'))]
22	DO_WRITE2	CHECKNXT	[((SDRAM_TYPE = 0 and BL > 1 or SDRAM_TYPE > 0 and BL > 2) and (downcnt_done = '1'))]
23	DO_READ2	CHECKNXT	[((SDRAM_TYPE = 0 and BL > 1 or SDRAM_TYPE > 0 and BL > 2) and (downcnt_done = '1'))]
24	DO_PRECHARGE	DO_AUTO_REFRESH	[((timer_cmd_done = '1') and (timer_tREFI_done = '1'))]
25	DO_PRECHARGE	DO_ACTIVATE	[((timer_cmd_done = '1') and not (timer_tREFI_done = '1'))]
26	DO_AUTO_REFRESH	DO_ACTIVATE	[(timer_cmd_done = '1')]

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