We are using the TUSB2046BVF USB Hub chip in one of our designs. During a review I noticed that the implementation wasn't quite in line with the datasheet terminal function specification. The Hub chip is equipped with a serial interface (EECLK/EEDATA) capable of reading Device ID etc, from an external EEPROM. Since we are not using this feature, the EXTMEM# pin is pulled high (deasserted).
The datasheet state that if EXTMEM# is high, the EECLK terminal is disabled and must be left floating (unconnected). In this design, however, this is not the case. We have erroneourly pulled the EECLK pin high through a 1KOhm resistor. The design is currently undergoing a revision where EECLK will be left floating.
I would, however, very much like to know, if pulling EECLK high will have any side-effects on the functionality of the TUSB2046BVF. We haven't so far observed any malfunction that we would expect to be associated with the USB Hub circuitry
