L2800 Ver la hoja de datos (PDF) - Conexant Systems

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Fabricante

L2800

Integrated V.90/K56flex Modem Device Sets with USB Interface for Desktop Applications

Conexant Systems 

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Enumeration

The R8292 enumeration process consists of the following steps:

1. Get device descriptor. The host requests and reads the device descriptor to determine maximum packet size.

2. Set address. The host sends the R8292’s function address in a data packet using function endpoint 0. Device firmware

interprets this data.

3. Get device descriptor. The host requests and reads the device descriptor to determine such information as device class,

USB Specification compliance level, maximum packet size for endpoint 0, vendor id, product id. Etc.

4. Get configuration descriptor. The host requests and reads the device configuration descriptor to determine such

information as the number of interfaces and endpoints; endpoint transfer type, packet size, and direction; power source

;maximum power; etc. When the host requests the configuration descriptor, all related interface and endpoint descriptors

are returned.

5. Set configuration. The host assigns a configuration value to the device to establish the current configuration.

Endpoint Pairs

Data transfers with the host are made to/from endpoint pairs on the USB module. The R8292 provides three function endpoint

pairs as follows.

Endpoint Pair

Function Endpoint 0

Function Endpoint 1

Function Endpoint 2

Table 7. Endpoint Pairs

Transmit FIFO

Receive FIFO

8 bytes

16 bytes

8 bytes

8 bytes

16 bytes

8 bytes

USB Data Transfer Types

Control

Control, Interrupt, Bulk, Isochronous

Control, Interrupt, Bulk



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