kaul@icarus.eng.ohio-state.edu (Rich Kaul) (07/28/90)
Does anyone have any sources for vendors/suppliers of associative memories? TIA. -=- Rich Kaul | "Do not do unto others as you would that kaul@icarus.eng.ohio-state.edu | they should do unto you. Their tastes or ...!osu-cis!kaul | may differ." -Bernard Shaw
bkoball@cup.portal.com (Bruce R Koball) (07/28/90)
re: Rich Kaul's request fo commercial vendors of associative memories -- Advanced Micro Devices offers a part called the Am99C10. It's a 256 word by 48-bit content addressable memory chip, available in a variety of pkgs. It is optimized for LAN address decoding but is general enough to be useful elsewhere. Each CAM word has a 48-bit register and a 48-bit maskable comparato allowing a 48-bit input word to be compared against all 256 entries in a single 100 ns cycle. It also has single and multiple match detection with priority encoding. Bruce Koball Motion West 2210 Sixth Street Berkeley, CA 94710 415-540-7503 bkoball@cup.portal.com
rpw3@rigden.wpd.sgi.com (Rob Warnock) (07/28/90)
In article <KAUL.90Jul27144551@icarus.eng.ohio-state.edu> kaul@icarus.eng.ohio-state.edu (Rich Kaul) writes: +--------------- | Does anyone have any sources for vendors/suppliers of associative | memories? +--------------- Only one I know of is AMD. Their CAM part is the Am99C10A, and is a 256-word CAM, 48 bits in, 16 bits out. (There is also a global 48-bit mask register, so partial or wildcard matches are possible.) It does a match of a 48-bit input against all 256 words in 70 ns (or 100ns). Actually, that's a bit misleading, since it actually takes five 70ns (or 100ns in the slower, cheaper part) cycles to input the data and do a match, since the 48-bit input data to bve matched is fed 16 bits at a time (28-pin package): Cycle#1: Strobe in input data <47:32> Cycle#2: Strobe in input data <31:16> Cycle#3: Strobe in input data <15:0> Cycle#4: ...wait for match to occur... Cycle#5: Read out match status, and if matched, 16-bit answer. Its primary intended application is in high-speed LAN interfaces (Ethernet, FDDI, etc.) to implement (1) multicast address recognition and (2) source address recognition for filtering bridges. The Am99C10A comes in a 28-pin package (400 mil CERDIP or 300 mil plastic), and costs about $30 each (quantity 1000) for the 100ns plastic part. AMD's address/phone: Advanced Micro Devices (408)732-2400 901 Thompson Place (800)538-8450 P.O.Box 3453 Sunnyvale, CA 94088-3453 (I just happened to have an Am99C10A data sheet lying around...) -Rob ----- Rob Warnock, MS-9U/510 rpw3@sgi.com rpw3@pei.com Silicon Graphics, Inc. (415)335-1673 Protocol Engines, Inc. 2011 N. Shoreline Blvd. Mountain View, CA 94039-7311