USB3503 datasheet(25/82 Pages) SMSC

25 / 82 page

USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3503A

Revision 1.1 (02-07-13)

DATASHEET

Chapter 5 Configuration Options

5.1

Hub Configuration Options

The SMSC Hub supports a number of features (some are mutually exclusive), and must be configured

in order to correctly function when attached to a USB host controller. There are two principal ways to

configure the hub: by writing to configuration registers using the serial slave port, or by internal default

settings. Any configuration registers which are not written by the serial slave retain their default

settings.

5.1.1

Multi/Single TT

SMSC’s USB 2.0 Hub is fully specification compliant to the Universal Serial Bus Specification Revision

2.0 April 27,2000 (12/7/2000 and 5/28/2002 Errata). Please reference Chapter 11 (Hub Specification)

for general details regarding Hub operation and functionality.

For performance reasons, the Hub provides 1 Transaction Translator (TT) per port (defined as Multi-

TT configuration), and each TT has 1512 bytes of periodic buffer space and 272 Bytes of non- periodic

buffer space (divided into 4 non-periodic buffers per TT), for a total of 1784 bytes of buffer space for

each Transaction Translator.

When configured as a Single-TT Hub (required by USB 2.0 Specification), the Single Transaction

Translator will have 1512 bytes of periodic buffer space and 272 bytes of non-periodic buffer space

(divided into 4 non-periodic buffers per TT), for a total of 1784 bytes of buffer space for the entire

Transaction Translator. Each Transaction Translator’s buffer is divided as shown in Table 5.1,

"Transaction Translator Buffer Chart".

5.2

Default Serial Interface Register Memory Map

The Serial Interface Registers are used to customize the USB3503 for specific applications. Reserved

registers or reserved bits within a defined register should not be written to non-default values or

undefined behavior may result.

Table 5.1 Transaction Translator Buffer Chart

Periodic Start-Split Descriptors

256 Bytes

Periodic Start-Split Data

752 Bytes

Periodic Complete-Split Descriptors

128 Bytes

Periodic Complete-Split Data

376 Bytes

Non-Periodic Descriptors

16 Bytes

Non-Periodic Data

256 Bytes

Total for each Transaction Translator

1784 Bytes

USB3503 Datasheet(PDF) 25 Page - SMSC Corporation

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