caching - RISC-V Core的一些输入/输出的简要说明

,input fetch_accept_i ,input icache_accept_i ,input icache_valid_i ,input icache_error_i ,input [ 31:0] icache_inst_i ,input icache_page_fault_i ,input fetch_invalidate_i ,input branch_request_i ,input [ 31:0] branch_pc_i ,input [ 1:0] branch_priv_i // Outputs ,output fetch_valid_o ,output [ 31:0] fetch_instr_o ,output [ 31:0] fetch_pc_o ,output fetch_fault_fetch_o ,output fetch_fault_page_o ,output icache_rd_o ,output icache_flush_o ,output icache_invalidate_o ,output [ 31:0] icache_pc_o ,output [ 1:0] icache_priv_o ,output squash_decode_o

,input fetch_accept_i : fetch is accepted by fetch stage (signal come from decode) ,input icache_accept_i : instruction cache accept the request from fetch unit ,input icache_valid_i : icache answer is valid ,input icache_error_i : icache answer made an error ,input [ 31:0] icache_inst_i : instruction fetch by the cache ,input icache_page_fault_i : cache did a page fault exception\ ,input fetch_invalidate_i : fetch was invalid ,input branch_request_i : fetch unit made a branch request ,input [ 31:0] branch_pc_i : branch address of pc ,input [ 1:0] branch_priv_i : current priviledge of the core (M, S or U) // Outputs ,output fetch_valid_o : fetch request is valid ,output [ 31:0] fetch_instr_o : ? ,output [ 31:0] fetch_pc_o : current pc which is fetch ,output fetch_fault_fetch_o : fetch did a fault ,output fetch_fault_page_o : fault did a page fault ,output icache_rd_o : ? ,output icache_flush_o : flush request to the cache ,output icache_invalidate_o : invalidate request to the cache ,output [ 31:0] icache_pc_o : current pc ,output [ 1:0] icache_priv_o : priviledge mode ,output squash_decode_o : ?