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Unzlbunzl
Joined: 30 Jan 2007
Posts: 468
Location: Graz, Austria
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 Posted: Thu Oct 11, 2007 3:53 pm Post subject: SN74AS888/890 bit slice? |
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hi! does anybody have further info on sn74as888 and sn74as890? some google hits make them look like 8-bit slice processors but nothing further.
regards
Christian |
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Fri Oct 12, 2007 6:43 am Post subject: |
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sn74as888 is definitely a bit-slice processor. I ran out of usable time before I could get more info...
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Debs |
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gshv
Joined: 01 Feb 2003
Posts: 7898
Location: Fairfax, VA USA
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| Posted: Fri Oct 12, 2007 9:12 am Post subject: |
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SN54AS888/SN74AS888 is an 8-bit ALU that supports 13 arithmetic and logical operations: add, subtract, divide, multiply, absolute value, etc. Multiple AS888 units can be cascaded, i.e. it's possible to use multiple ALUs to build 8/16/24/...-bit processors. By the way, there is SN54AS887/SN74AS887 - this one is not cascadable.
SN54AS890/SN74AS890 is a 14-bit microsequencer. The chip has 64 instructions, includes stack memory and supports interrupts.
Gennadiy |
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Chiefish
Joined: 23 Sep 2007
Posts: 2153
Location: Northwest N.J. U.S.A
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| Posted: Fri Oct 12, 2007 9:14 am Post subject: |
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Nice work Gen, how did you manage to come up with that , i googled the heck out of that p/n and couldnt find anything even close to what you just described.
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gshv
Joined: 01 Feb 2003
Posts: 7898
Location: Fairfax, VA USA
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| Posted: Fri Oct 12, 2007 10:12 am Post subject: |
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This info is from Texas Instruments "Maser Selection Guide" book.
Gennadiy |
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Unzlbunzl
Joined: 30 Jan 2007
Posts: 468
Location: Graz, Austria
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| Posted: Sun Oct 14, 2007 11:16 am Post subject: |
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| Thanks for digging out that info, these seem to be quite uncommon. |
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