状态机的设计比较重要,本设计的主状态机是:空闲状态、读状态、写状态,从状态机分为读状态机(rd_fsm_r)和写状态机(wr_fsm_r),读状态机和写状态机的状态转移图如图所示。 状态机 根据AHB总线地址段和数据段的特性,可将其分为:空闲状态、请求总线状态、地址段状态、读/写数据状态和读/写最后一个字节状态。注...
wire fsm_wr_idle = wr_fsm_r == WR_IDLE; wire fsm_wr_busreq = wr_fsm_r == WR_BUSREQ; wire fsm_wr_addr = wr_fsm_r ==WR_ADDR; wire fsm_wr_wd = wr_fsm_r == WR_WD; wire fsm_wr_lwd = wr_fsm_r === WR_LWD; wire wr_last_data = wr_cnt_r == data_size - 'd1...
2'b10 : 2'b11;wireaddr_add_en = (main_fsm_r == S1 || main_fsm_r == S2) &&(fsm_rd_addr|| fsm_rd_rd || fsm_wr_addr ||fsm_wr_wd);//haddr_ralways@(posedgehclk_i)if(~irst_n) haddr_r<=32'd0;elseif(main_fsm_r == S1 & fsm_rd_busreq &hready_i) haddr_r<=rd_b...
而这个ENABLE信号的产生是通过一个状态机产生的。 ENABLE信号产生FSM APB slave接口: APB slave 接口 APB到AHB接口: 假设要做一个AHB的master,要去读APB的信号。 AHB每两个cycle才能读一个,因为APB最快读数据也得两个cycle。如果AHB和APB的时钟频率是一样的,那么PRDATA读出来可以直接赋值给HRDATA,但是如果APB的...
[导读]前两篇进阶文章主要讲述了AHB slave的核心内容,这篇来讲AHB lite master的设计。 前两篇进阶文章主要讲述了AHB slave的核心内容,这篇来讲AHB lite master的设计。 AHB master主要用于一下三个方面: 1.计算模块和crossbar的沟通桥梁,例如加速器模块。
rd_data_r<=hrdata_i;assignhwdata_o = (main_fsm_r == S2 & (fsm_wr_wd || fsm_wr_lwd) & hready_i) ? rd_data_r[wr_cnt_r] :32'b0;assignhaddr_o =haddr_r;endmodule 至此,本文基于AHB总线的master读写设计就完成了。在设计过程中,重要的是画出状态机,并理解每个状态的逻辑及状态与状态...
ahb_fsm <= ST_AHB_IDLE; HREADYOUT <= 1'b1; HRESP <= HRESP_OKAY; endtask //ahb_no_transfer task ahb_prep_transfer; ahb_fsm <= ST_AHB_TRANSFER; HREADYOUT <= 1'b0; //hold off master HRESP <= HRESP_OKAY; ahb_treq <= 1'b1; //request data transfer ...
In AMBA system, AHB master is the main component that initiates the read and writes transactions. This paper focuses on design of finite state machine for the implementation of AHB master in Verilog HDL.Keywords- AMBA, AHB, APB, AHB Master, SOC, Split transaction.G.S.Arunkumar...
The FSM for AHB master has been generated and simulated on modelsim HDL tool. The scheme involves several AMBA features of pipelined operation, multiple bus masters, burst transfers, split transations. The purpose of this paper is to propose a scheme to implement reconfigurable architectures so ...
图3Multi??layer AHB总线架构在图3的架构中,有很多地方可以应用SVA断言语言,例如,在任何一个时刻,Layer2上面的3个master只能有一个master的grant信号有效。用断言语言描述如下: assertion_grant :assert property(@(posedge clk) $countones({hgrantm1,hgrantm2,hgrantm3}) =1 ); 利用SVA的系统函数$countones...