GL850 datasheet(23/40 Pages) ETC

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GL850 USB 2.0 4-Port HUB Controller

Page 23

4. PORT_NO: port number, value must be 1~4.

5. DEVICE REMOVALBE:

PORT4

REMOVABLE

PORT3

REMOVABLE

PORT2

REMOVABLE

PORT1

REMOVABLE

0: Device attached to this port is removable.

1: Device attached to this port is non-removable.

6. VENDOR LENGTH: offset 08h contains the length of the vendor string. Values of vendor string is

contained from 09h~1fh.

7. PRODUCT LENGTH: offset 20h contains the length of product string. Values of product string is

contained from 21h~37h.

8. SERIAL NUMBER LENGTH: offset 38h contains the value of serial number string. Values of serial

number string is contained after offset 39h.

The schematics between GL850 and 93C46 is depicted in the following figures:

VCC

GND

AMBER1

GREEN1

AMBER2

PGANG

93C46

DVDD

Figure 5.9 - Schematics Between GL850 and 93C46

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.

5.3 USB Protocols

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.

GL850 Datasheet(PDF) 23 Page - List of Unclassifed Manufacturers