riscy
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Re: Mips Chips from NEC

To: riscy@pyramid.com
Subject: Re: Mips Chips from NEC
From: Andreas Busse <andy@resi.waldorf-gmbh.de>
Date: Tue, 27 Jul 93 08:59:34 +0200
Reply-to: riscy@pyramid.com
Sender: owner-riscy@pyramid.com
> I received the data sheets on the 4000/4400 PC/SC
> 
> Here's a quick summary:  
>       Part #       package   Power Cache 
>4000PC PD30400RJ-50 179 pin    5v   8k+8k
>       PD30400RP-50 179 pin+HS 5v   8k+8k
>4000SC PD30401RJ-50 447 pin    5v   8k+8k
>       PD30401RP-50 447 pin+HS 5v   8k+8k
>
>4400PC PD30410RJ-(50,67,75)  179 pin    5v     16k+16k 
>       PD30410RP-(50,67,75)  179 pin+HS 5v     16k+16k 
>        PD30410LRJ-(50,67,75) 179 pin    3.3v  16k+16k 
>       PD30410LRP-(50,67,75) 179 pin+HS 3.3v   16k+16k 
>
>4400SC PD30411RJ-(50,67,75)  447 pin    5v     16k+16k 
>       PD30411RP-(50,67,75)  447 pin+HS 5v     16k+16k 
>       PD30411LRJ-(50,67,75) 447 pin    3.3v   16k+16k 
>       PD30411LRP-(50,67,75) 447 pin+HS 3.3v   16k+16k 
>
>HS means with heat-sink, all chips are ceramic. The last two digits of the
>part number is the external clock speed, internal is twice that.
>
>Main difference between 4000 and 4400 is double the cache and faster clocks.
>
>Main difference between PC and SC is the the the SC supports a 128 bit 
>secondary cache interface support.  But based on there diagrams the
>PC supports a secondary cache, just not 128 bits wide.
>
>All chips share: 
>       64 bit microprocessor, integer, fp, registers, and virtual addresses.
>       Dual instruction issue with no restrictions.
>       32 64 bit general purpose registers and 16 64 bit fp registers.
>       one level deep uncached store buffer.
>
>The 4400 is around 94 specint and 105 specfp (seperate source)
>
>The 4000 is listed as 62 specint, and 63 specfp.
>
>The 4200 is mentioned in passing:  plastic, 1.5 Watts, 80 Mhz internal clock,
>55 SPECint92 and 30 SPECfp92.

Yes, and the main difference between the R4200 and the other R4x00 CPUs
are that is *not* pincompatibel, that it has the old R3000 pipeline and
a simpler FPU. Note: This is what I've heard. I will receive data sheets
this week. Perhaps things have changed...
However, if the R4200 is no real R4x00 CPU I would suggest to use
one of the others, even if it is more expensive at the moment.
Are we going to build a R4000 machine now ? I would appreciate this !

Andy

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