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IEEE 1394a Three-Port Cable Transceiver/Arbiter
http://www.ti.com/product/tsb12lv26
Also contains a TSB12LV26 PCI-1394 bridge
Markings:
(TI) 18A5YCHT TSB41AB3
TODO clean and image
This die was originally thought to be the TSB41 but the dies seem to have gotten mixed up. Not sure what chip this came from!
Size is approximately 2290 x 1850 μm (4.23 mm2)
Top left:
TSB41 ULP01 A
Bottom left:
(M) TI 1999 [pin 1 marking]