Schematics, Philips semiconductors – Philips ISP1520 User Manual

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Philips Semiconductors

UM10014_4

ISP1520 Hi-Speed USB Hub Demo Board

User manual

Rev. 04.00 — 11 May 2004

10 of 18

An external I

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

C-bus EEPROM. The Hub

Controller and the EEPROM have different I

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

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