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Breaded Electronics / Embedded » Connectivity » USB
USB to SPI Master ot Slave: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4751 MAX3420E http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3639 MAX3421E
http://www.bioinspired.com/users/ajg112/circuits/max3420.shtml
http://dev.emcelettronica.com/usb-io-board-microchip-usb-port-drive