![]() They allow their candidates to pick from only Java, C++, Python, Go or JavaScript. Most companies will allow you to code in the language of your choice. Perhaps I'm missing something else or my understanding of always blocks isn't as firm as I thought. Picking a programming language Before anything else, you need to pick a programming language for your algorithmic coding interview. I understand that in an always_ff block the assignments are non-blocking and happen at the end of the block, but in this example there's only one assignment so OK.Īt this point in the book Chu has mentioned FSMs and FSMDs but hasn't formally introduced those concepts in this chapter. How is syn_clr just sampled in at the rising edge of the clock, and hence is synchronous, if its in the always_comb block. ![]() I don't see the connection between what is going on in the always_ff block which is just sensitive to the rising edge of the clock and the always_comb which will activate whenever syn_clr changes. So indirectly it seems, syn_clr (or the results of checking syn_clr) is sampled at the rising edge of the clock. Then, at the rising edge of the clock, r_reg gets assigned the value of r_next, as it was set in the always_comb block. My thinking is that when syn_clr changes, the always_comb block is activated, and r_next is updated to be either 1'b0 or d. In the first ( d_ff_sync_clr_2seg), longer example, the statement Chu makes that syn_clr is only checked at the rising edge of the clock isn't as clear. In the second example ( d_ff_sync_clr_1seg), I can clearly see that yes, at the rising edge of the clock the always_ff block is activated and syn_clr is indeed sampled. He also provides a different formatting style for the same circuit which I found clearer: module d_ff_sync_clr_1seg In the discussion, he states the syn_clr signal is only checked at the rising edge of the clock. ![]() As an example, he shows how a DFF with synchronous clear is coded up: module d_ff_sync_clr_2seg In it, Chu describes the method where a sequential circuit has the sequential part and the combinational part. I am currently working through Pong Chu's FPGA Prototyping By System Verilog Examples, specifically on Chapter 4 which covers sequential circuits. ![]()
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