I just noticed an article in ARM's IQ magazine about free SystemC TLM-2.0 models for AMBA components like AXI. http://www.iqmagazineonline.com/current/index.php#Trans
It was frustrating to find the last half-page missing from its pdf but after some hunting around I located it tacked-on to the end of another article ( http://www.iqmagazineonline.com/current/index.php#Usage ).
The model pack from Carbon Design Systems includes adaptors from the loosely-timed (LT) fast and approximate level, down to the cycle-timed (CT) accurate but slow level. The pack is available from: http://portal.carbondesignsystems.com/ALLIp.aspx?Category=Free%20Downloads
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