gl850g Genesys Logic, gl850g Datasheet - Page 23

• Manufacturer Part Number: gl850g
• Description: Gl850g Usb 2.0 Low-power Hub Controller
• Manufacturer: Genesys Logic

©2000-2008 Genesys Logic Inc. - All rights reserved.
GL850G firstly verifies the check sum after power on reset. If the check sum is correct, GL850G will take
the configuration of 93C46 as part of the descriptor contents. To prevent the content of 93C46 from being
over-written, amber LED will be disabled when 93C46 exists.
Both low/high-enabled power switches are supported. It is determined by jumper setting, based on the state
of pin AMBER2, as the following table:
Number of downstream port can be configured as 2/3/4 ports by pin strapping in addition to EEPROM,
based on the state of pin AMBER 3, AMBER 4, as the following table:
For compound application or embedded system, downstream ports that always connected inside the system
can be set as non-removable based on the state of corresponding status LED, pin GREEN 1~4. If the pin is
pull high in the initial stage (POR reset), the corresponding port will be set as non-removable.
5.2.7 Power Switch Enable Polarity
5.2.8 Port number configuration
5.2.9 Non-removable port configuration
Figure 5.9 – Schematics Between GL850G and 93C46
Table 5.3 – Configuration by power switch type
AMBER2
Table 5.4 – Port number configuration
AMBER3
0
1
EE_SK
EE_DO
EE_CS
EE_DI
1
0
0
CS
SK
DI
DO
Power switch enable polarity
GL850G USB 2.0 Low-Power HUB Controller
AMBER 4
0
1
0
93C46
High-active
Low-active
GND
VCC
NC
NC
Port number
DVDD
2
3
4
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