gl850 ETC-unknow, gl850 Datasheet - Page 23

• Manufacturer Part Number: gl850
• Description: Usb 2.0 4-port Hub Controller
• Manufacturer: ETC-unknow

5.3 USB Protocols
©2000-2003 Genesys Logic Inc.—All rights reserved.
The schematics between GL850 and 93C46 is depicted in the following figures:
GL850 firstly verifies the check sum after power on reset. If the check sum is correct, GL850 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.
To behave as a standard USB2.0 hub, some protocols defined in Chapter 9 and Chapter 11 of Universal
Serial Bus Specification Revision 2.0 must be followed. We firstly classify these standard requests and hub
class requests in section 6.1. Descriptors are described in section 6.2, which contain the detailed
information for the hub.
4. PORT_NO: port number, value must be 1~4.
5. DEVICE REMOVALBE:
6. VENDOR LENGTH: offset 08h contains the length of the vendor string. Values of vendor string is
7. PRODUCT LENGTH: offset 20h contains the length of product string. Values of product string is
8. SERIAL NUMBER LENGTH: offset 38h contains the value of serial number string. Values of serial
contained from 09h~1fh.
contained from 21h~37h.
number string is contained after offset 39h.
0: Device attached to this port is removable.
1: Device attached to this port is non-removable.
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Figure 5.9 - Schematics Between GL850 and 93C46
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AMBER1
AMBER2
GREEN1
PGANG
REMOVABLE
PORT4
CS
SK
DI
DO
REMOVABLE
PORT3
93C46
GL850 USB 2.0 4-Port HUB Controller
GND
VCC
NC
NC
REMOVABLE
PORT2
DVDD
REMOVABLE
PORT1
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