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Groups > comp.lang.forth > #37480
| From | rickman <gnuarm@gmail.com> |
|---|---|
| Newsgroups | comp.lang.forth |
| Subject | Re: What is greenarrays up to lately? |
| Date | 2015-03-20 12:31 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <mehhvr$a2d$1@dont-email.me> (permalink) |
| References | (8 earlier) <med4tn$iue$1@dont-email.me> <41103916-05e6-48cd-9fed-6b4680278b0a@googlegroups.com> <20150319222058.65440b4a@T60A> <mefl6v$dam$1@dont-email.me> <79a4495a-0b68-41bf-b435-d7d9fb337db1@googlegroups.com> |
On 3/20/2015 11:24 AM, JUERGEN wrote:
> On Thursday, March 19, 2015 at 11:14:25 PM UTC, Bernd Paysan wrote:
>> wrote:
>>
>>> On Thu, 19 Mar 2015 07:22:26 -0700 (PDT)
>>> Is it true? Are Chucks chips internally asynchronous, or only
>>> asynchronous at the boundary of each processor core?
>>
>> There are a few different delay elements within each core to determine the
>> speed of different operations. So it's not a single clock per core, either.
>>
>> What's clearly wrong is that a synchronous device has "billions of dumb
>> nodes which dissipate useless power"; if you do synthesize your Verilog to
>> save power, you'll enable the clock gating option, and then, only those
>> nodes who need to actually get the clock. Sleeping cores wouldn't.
>>
>> All CPUs now, including the performance-optimized, are done that way, as
>> power dissipation is the main problem with modern processes: you have to get
>> that down to a reasonable value.
>>
>> Chuck stopped using mainstream EDA tools in the early 90s, and his
>> statements are all true for the EDA situation 20 years ago.
>>
>> --
>> Bernd Paysan
>> "If you want it done right, you have to do it yourself"
>> http://bernd-paysan.de/
>> net2o ID: kQusJzA;7*?t=uy@X}1GWr!+0qqp_Cn176t4(dQ*
>
> Bernd, even if you disable gates from changing by gating them, you still have the complete clock system across the chip and the capacities have to be driven. I assume this is what is meant. And only by reducing the clock tree length this can be reduced - independent of what you stated I assume?
Perhaps you don't understand where the power goes in a clock tree. Just
as in a real tree, there are many, many leaves and few higher level
trunks (lower trunks in a real tree). These main trunks do not
dissipate most of the power, it is the branches feeding the lower level
nodes and the nodes themselves that consume most of the power. So when
a section of the chip is gated from the clock, the clock line feeding
the gate circuitry is not dissipating so much power.
Clk --+--+--+---X----+--+--+---O
| | | | | +---O
| | | | +------O
| | | +---------O
| | +---X----+--+--+---O
| | | | +---O
| | | +------O
| | +---------O
| +------X----+--+--+---O
| | | +---O
| | +------O
| +---------O
+---------X----+--+--+---O
| | +---O
| +------O
+---------O
Here the X represents the clock gate, the lines are clock routes and the
O are FFs. You can see how much of the routing is in the lower levels
and how the gating will reduce power in the clock routing.
--
Rick
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What is greenarrays up to lately? polymorph self <jackvanc3@gmail.com> - 2015-03-11 21:54 -0700
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-15 14:08 -0700
Re: What is greenarrays up to lately? hughaguilar96@gmail.com - 2015-03-15 19:10 -0700
Re: What is greenarrays up to lately? polymorph self <jackvanc3@gmail.com> - 2015-03-16 21:58 -0700
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-17 12:19 -0700
Re: What is greenarrays up to lately? Jason Damisch <jasondamisch@yahoo.com> - 2015-03-17 13:24 -0700
Re: What is greenarrays up to lately? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2015-03-16 18:03 +0000
Re: What is greenarrays up to lately? Jan Coombs <Jan-54 <jenfhaomndgfwutc@murmic.plus.com>> - 2015-03-16 19:42 +0000
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-17 16:26 -0400
Re: What is greenarrays up to lately? Jan Coombs <Jan-54 <jenfhaomndgfwutc@murmic.plus.com>> - 2015-03-19 11:24 +0000
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-20 00:12 -0400
Re: What is greenarrays up to lately? Jan Coombs <Jan-54 <jenfhaomndgfwutc@murmic.plus.com>> - 2015-03-21 23:03 +0000
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-21 21:14 -0400
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-22 00:38 -0700
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-22 18:35 -0400
Re: What is greenarrays up to lately? Paul Rubin <no.email@nospam.invalid> - 2015-03-22 16:18 -0700
Re: What is greenarrays up to lately? Bernd Paysan <bernd.paysan@gmx.de> - 2015-03-23 01:06 +0100
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-22 22:20 -0400
Re: What is greenarrays up to lately? Jason Damisch <jasondamisch@yahoo.com> - 2015-03-23 08:02 -0700
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-23 16:13 -0400
Offer + Re: What is greenarrays up to lately? Jan Coombs <Jan-54 <jenfhaomndgfwutc@murmic.plus.com>> - 2015-04-08 09:51 +0100
Re: Offer + Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-04-10 00:47 -0400
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-17 16:24 -0400
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-17 13:57 -0700
Re: What is greenarrays up to lately? Paul Rubin <no.email@nospam.invalid> - 2015-03-17 14:36 -0700
Re: What is greenarrays up to lately? Paul Rubin <no.email@nospam.invalid> - 2015-03-17 16:36 -0700
Re: What is greenarrays up to lately? Dennis Ruffer <daruffer@gmail.com> - 2015-03-18 07:00 -0700
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-18 15:54 -0700
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-18 19:27 -0400
Re: What is greenarrays up to lately? Paul Rubin <no.email@nospam.invalid> - 2015-03-18 16:44 -0700
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-18 20:24 -0400
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-19 07:22 -0700
Re: What is greenarrays up to lately? Jan Coombs <Jan-54 <jenfhaomndgfwutc@murmic.plus.com>> - 2015-03-19 22:20 +0000
Re: What is greenarrays up to lately? Bernd Paysan <bernd.paysan@gmx.de> - 2015-03-20 00:14 +0100
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-20 08:24 -0700
Re: What is greenarrays up to lately? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-03-20 15:30 +0000
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-20 08:49 -0700
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-20 09:04 -0700
Re: What is greenarrays up to lately? Bernd Paysan <bernd.paysan@gmx.de> - 2015-03-20 20:32 +0100
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-20 12:31 -0400
Re: What is greenarrays up to lately? Bernd Paysan <bernd.paysan@gmx.de> - 2015-03-20 19:44 +0100
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-20 08:20 -0700
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-20 00:22 -0400
Re: What is greenarrays up to lately? Mark Wills <markwills1970@gmail.com> - 2015-03-20 03:07 -0700
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-20 08:41 -0700
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-20 12:49 -0400
Re: What is greenarrays up to lately? Jan Coombs <Jan-54 <jenfhaomndgfwutc@murmic.plus.com>> - 2015-03-21 13:29 +0000
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-20 12:43 -0400
Re: What is greenarrays up to lately? Jason Damisch <jasondamisch@yahoo.com> - 2015-03-20 09:48 -0700
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-19 07:34 -0700
Re: What is greenarrays up to lately? Paul Rubin <no.email@nospam.invalid> - 2015-03-19 13:23 -0700
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-20 00:51 -0400
Re: What is greenarrays up to lately? Paul Rubin <no.email@nospam.invalid> - 2015-03-20 21:05 -0700
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-21 04:04 -0400
Re: What is greenarrays up to lately? Paul Rubin <no.email@nospam.invalid> - 2015-03-21 09:16 -0700
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-21 14:02 -0400
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-20 00:39 -0400
Re: What is greenarrays up to lately? JUERGEN <epldfpga@aol.com> - 2015-03-19 07:15 -0700
Re: What is greenarrays up to lately? Howerd <howerdo@yahoo.co.uk> - 2015-03-18 00:09 -0700
Re: What is greenarrays up to lately? Paul Rubin <no.email@nospam.invalid> - 2015-03-18 00:23 -0700
Re: What is greenarrays up to lately? lynx <rinkasu@kaze.void.null> - 2015-03-19 23:40 +0000
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-17 23:16 -0400
Re: What is greenarrays up to lately? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2015-03-18 11:05 +0000
Re: What is greenarrays up to lately? rickman <gnuarm@gmail.com> - 2015-03-22 22:38 -0400
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