Philips UM10011 - Manual (Page 11)

Philips Semiconductors
UM10011_4
ISP1521 Hi-Speed USB Hub Demo Board
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
User manual Rev. 04.00 — 17 June 2004 11 of 20
5.9. Other Jumpers
5.9.1. J13 (NOOC)
This jumper will set the OC capabilities in the hub’s descriptors (see Table 5-4).
Table 5-4: Overcurrent Support Selection Using J11 and J12
*—Default settings.
Note: this jumper is for setting the hub’s descriptor only. To inhibit the overcurrent detection,
the OC pins must be tied to V
CC
(5 V)
5.9.2. J14 (SUSPEND)
This jumper is provided for debugging purposes. Logic 1 on the SUSPEND signal indicates that
the hub is in the suspend mode. In the default setting jumper J14 is used (pulled down to GND).
Table 5-5: J14 Mode Setting
6. Schematics
J13 NOOC Logic State
OFF No overcurrent support 1 (HIGH)
ON Overcurrent support* 0 (LOW)
J14 Mode
OFF Debugging purpose
ON Normal mode (default)