CODEWITHSUNDEEP
verilogsystem-verilog
VLSI Geek
VLSI Geek

Reputation: 1

How many bits does $realtime return in Verilog and Systemverilog?

How many bits does $realtime return in Verilog and Systemverilog?

Upvotes: 0

Views: 2085

Answers (2)

l Steveo l
l Steveo l

Reputation: 558

From sutherland hdl quick ref. Pg 40 in the doc, 44 in your pdf viewer

http://www.sutherland-hdl.com/pdfs/verilog_2001_ref_guide.pdf

$time

$stime

$realtime

Returns the current simulation time as a 64-bit vector, a 32-bit integer or a real number, respectively.

The value returned will depend on your timescale. i.e. if timescale is 1ns/1ps, and you have ran for 1us, you will return 1,000.000.

Upvotes: 0

dave_59
dave_59

Reputation: 42738

$realtime does not return bits, it returns an double precision floating point number, which has requires 1 bit for the sign, 11 bits for the exponent, and 52-bits for the mantissa. You cannot access individual bits of a real number, so the total number of bits is irrelevant.

Upvotes: 2

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