【开卷】第23期 MPS芯源2022数字IC笔试题
MPS芯源2022数字IC
时间2021.08.25
1、Please code the divider by 3 with Verilog(50% duty cycle).用Verilog设计一个3分频器，要求50%占空比。
2、Please describe the digital P&R flow.请简述数字后端P&R流程。
3、Please use a MUX and INV to implement aXOR.如何用一个2选一的MUX和一个INV实现异或。
4、What are recovery and removal times?请描述recovery时间和removal时间的概念。
5、The clock cycle is T, the clock toregister output delay is Tco, setup and hold time of a register are Tsetup andThold, what's the Tdelay constrain?时钟周期为T，时钟到寄存器输出延时Tco，寄存器建立时间Tsetup，寄存器保持时间Thold。请描述逻辑延时Tdelay的建立和保持时间要求（不考虑时钟延时）。
6、What's the difference between a LATCH anda DFF?请描述LATCH和DFF的概念和区别?
7、What's the difference between asynchronous and an asynchronous circuit?同步电路和异步电路的区别是什么?
8、What is IR-drop, in which area will beeasy to have IR-drop problem ?什么是IR-drop，在那些地方容易出IR-drop问题?
9、How do you synchronize an asynchronousinput?异步信号如何进行同步?
10、Please draw the state machine transmissiondiagram of the array detection 10010，code with Verilogand build the testbench and testcase to get 100% fsm coverage.画出可以检测10010序列的状态图，并用Verilog实现，搭建测试平台并写出可以达到100%状态机覆盖率的testcase。
11、What are gate-level simulations? You havea device that can be programmed via an 12C interface. What type of tests do yourecommend to run for gate level only?什么是门级仿真（后仿）?如果你有一个设备通过12C接口配置，有哪些针对门级仿真的测试用例?
14、Please describe the ECO flow(includingpre-mask ECO and post-mask ECO).请描述ECO流程，包括pre-mask和post-mask ECO。
15、What are various techniques to resolverouting congestion?如何解决routing congestion问题?
16、Please describe the rtl with INV, AND, OR andDFF. 请用与、或、非门和寄存器画出代码所描述的电路。
always@(posedgeclk or negedge rst_n)
begin
if(!rst_n)
begin
cnt<= 2'd0;
end
else if(cnt_en)
begin
if(ina)
cnt <= cnt+2'd1;
end
else
begin
cnt <=2'd0;
end
end
18、Two modules share one single port ram,please design an Arbiter with following requirements （按要求编写代码）：
a)Module A has high priority；
b)Basic ram signal: clk, rst_n, wren, addr [7:0], wdata [7:0], rdata [7:0]；
c)Ram read access latency is 2 Tclk；
always@(posedge clk or negedge rst_n) begin
if(!rst_n)
C<=1'b0;
else if (B)
C<=~A;
else;
end
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