
GL850 USB 2.0 4-Port HUB Controller
2000-2003 Genesys Logic Inc.—All rights reserved.
Page 22
5.2.4 LED Connections
GL850 controls the LED lighting according to the flow defined in section 11.5.3 of
Universal Serial Bus
Specification Revision2.0
. Both manual mode and Automatic mode are supported in GL850. When GL850
is globally suspended, GL850 will turn off the LED to save power.
AMBER/GREEN
Inside GL850
On PCB
DGND
LED
Figure 5.8 - LED Connection
5.2.5 EEPROM Setting
GL850 replies to host commands by the default settings in the internal ROM. GL850 also offers the ability
to reply to the host according to the settings in the external EEPROM(93C46). The following table shows
the configuration of 93C46.
Table 5.1 - 93C46 Configuration
00h
01h
02h
03h
04h
05h
06h
07h
00 VID_H VID_L PID_H PID_L CHKSUM FF PORT_NO
DEVICE
REMOVABLEFF FF FF FF FF FF FF FF
08 VENDOR
LENGTH
10
XX
18
XX
20 PRODUCT
LENGTH
28
XX
30
XX
SERIAL
NUMBER
LENGTH
40
XX
48
XX
Note: 1. VID_H/VID_L: high/low byte of VID value
2. PID_H/PID_L: high/low byte of PID value
3. CHKSUM: CHKSUM must equal to VID_H + VID_L + PID_H + PID_L + 1,otherwise
firmware will ignore the EEPROM settings.
XX
XX
XX
XX
XX
XX
XX
XX XX XX XX XX XX XX XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX XX XX XX XX XX XX XX
XX XX XX XX XX XX XX XX
XX
XX
XX
XX
XX
XX
XX
XX XX XX XX XX XX XX XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX XX XX XX XX XX XX XX
XX XX XX XX XX XX XX XX
38
XX
XX
XX
XX
XX
XX
XX
XX XX XX XX XX XX XX XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX XX XX XX XX XX XX XX
XX XX XX XX XX XX XX XX