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Philips Semiconductors
UM10014_4
ISP1520 Hi-Speed USB Hub Demo Board
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
User manual Rev. 04.00 — 11 May 2004 10 of 18
An external I
2
C-bus controller acting as a master can also be used to update hub descriptors
through the J42 connector.
The J10 jumper is connected to the “Write Protect” pin of the I
2
C-bus EEPROM. The Hub
Controller and the EEPROM have different I
2
C-bus device addresses. To program this IC
on-board, select the jumper according to Table 5-6. It is recommended that you program the
I
2
C-bus EEPROM before connecting the hub to USB through the USB host.
For convenience, the hub demo board is equipped with a socket for this component, allowing
easy programming using a universal EPROM programmer as well.
Table 5-6: EEPROM Programming
6. Schematics
J10 WP_N
ON Write enable
OFF Write protect