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Discussion Groups | TMS320C6x | RE: CCS V2.0 & C6711DSK About the single - cycle instruc tion

Technical discussions about the TI C6000 DSPs (including the c62x, c64x and c67x DSPs).

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RE: CCS V2.0 & C6711DSK About the single - cycle instruc tion - Dillon, Tom - Jul 30 16:38:00 2002

RE: [c6x] CCS V2.0 & C6711DSK About the single - cycle instruction

A single cycle instruction takes 1 cycle. But, there is a pipeline that has an impact on the measurement you made. You can try an experiment to prove it to yourself. Add 7 more instructions to the example you give below and then measure the total for the 8 instructions. My bet is that you will see 13-14 cycles and not (6*8=48cycles).

-----Original Message-----
From: fjulink [mailto:f...@yahoo.com.tw]
Sent: Tuesday, July 30, 2002 9:39 AM
To: c...@yahoogroups.com
Subject: [c6x] CCS V2.0 & C6711DSK About the single - cycle instruction

Hi all:

I use the tool "Enable clock" try to test how much time the
single -cycle instruction need,

EX:
mvkl .s2 0x0001,b0

The resule of the view window show => 6 clocks

==>so "mvkl .s2 0x0001,b0" spend 6*6.7ns = 40.2 ns
       (the c6711 one clock time = 6.7ns)


     The single -cycle instruction means the instruction will be
execute in one cpu cycle?

      Are there any mistake above ?

      Please correct me!

      Thanks!!                          &n bsp;       Fjulink

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Re: CCS V2.0 & C6711DSK About the single - cycle instruc tion - fjulink - Jul 31 12:18:00 2002

I try to measure 7 instructions. It spend about 13-14 clock ex: line1 mvkl .s2 0x0001,b0 mvklh .s2 0xa000,b0 mvk .s1 0x1111,a1 mvklh .s1 0x1111,a1 mvkl .s2 0x0000,b1 mvklh .s2 0x24D3,b1 mvk .s1 0x1111,a1 line8 mvklh .s1 0x1111,a1 line9 ........ I set breakpoint at line9 and put line1 to line7 as range1 line1 to line8 as range2 in my session the result: range1 Incl.Count Incl. Total Incl.Max Incl.Min Incl. Average 2 14 14 14 7 Excl.Count Excl. Total Excl.Max Excl.Min Excl. Average 1 13 13 13 13 range2 Incl.Count Incl. Total Incl.Max Incl.Min Incl. Average 1 20 20 20 20 Excl.Count Excl. Total Excl.Max Excl.Min Excl. Average 1 19 19 19 19 What is the different between Incl. ... and Excl. ... above the result? why and mean what about the "Incl. Count" =2 ? Fjulink --- In c6x@y..., "Dillon, Tom" <tjdillon@t...> wrote: > A single cycle instruction takes 1 cycle. But, there is a pipeline that has > an impact on the measurement you made. You can try an experiment to prove > it to yourself. Add 7 more instructions to the example you give below and > then measure the total for the 8 instructions. My bet is that you will see > 13-14 cycles and not (6*8=48cycles). > > -----Original Message----- > From: fjulink [mailto:fjulink@y...] > Sent: Tuesday, July 30, 2002 9:39 AM > To: c6x@y... > Subject: [c6x] CCS V2.0 & C6711DSK About the single - cycle instruction > Hi all: > > I use the tool "Enable clock" try to test how much time the > single -cycle instruction need, > > EX: > mvkl .s2 0x0001,b0 > > The resule of the view window show => 6 clocks > > ==>so "mvkl .s2 0x0001,b0" spend 6*6.7ns = 40.2 ns > (the c6711 one clock time = 6.7ns) > The single -cycle instruction means the instruction will be > execute in one cpu cycle? > Are there any mistake above ? > > Please correct me! > > Thanks!! Fjulink > > _____________________________________