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USB2514 Datasheet(PDF) 19 Page - Microchip Technology |
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USB2514 Datasheet(HTML) 19 Page - Microchip Technology |
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19 / 57 page  2010 - 2015 Microchip Technology Inc. DS00001692C-page 19 USB251xB/xBi 5.0 INITIAL INTERFACE/CONFIGURATION OPTIONS The hub must be configured in order to correctly function when attached to a USB host controller. The hub can be con- figured either internally or externally by setting the CFG_SEL[1:0] pins (immediately after RESET_N negation) as out- lined in the table below. To configure the hub externally, there are two principal ways to interface to the hub: over SMBus or I2C EEPROM. The hub can be configured internally, where several default configurations are available as described in the table below. When configured internally, additional configuration is available using the strap options (listed in Section 3.3.1 on page 14). 5.1 Internal Register Set (Common to I2C EEPROM and SMBus) The register set available when configuring the hub to interface over I2C or SMBus is outlined in the table below. Each register has R/W capability, where EEPROM reset values are 0x00. Reserved registers should be written to 0 unless otherwise specified. Contents read from unavailable registers should be ignored. Note: See Chapter 11 (Hub Specification) of the USB specification for general details regarding hub operation and functionality. Note: Strap options are not available when configuring the hub over I2C or SMBus. TABLE 5-1: INITIAL INTERFACE/CONFIGURATION OPTIONS CFG_SEL[1] CFG_SEL[0] Description 0 0 Default configuration: • Strap options enabled • Self-powered operation enabled • Individual power switching • Individual over-current sensing 0 1 The hub is configured externally over SMBus (as an SMBus slave device): • Strap options disabled • All registers configured over SMBus 1 0 Default configuration with the following overrides: • Bus-powered operation 1 1 The hub is configured over 2-wire I2C EEPROM: • Strap options disabled • All registers configured by I2C EEPROM Address Register Name Default ROM Values (Hexidecimal) 00h Vendor ID LSB 24 01h Vendor ID MSB 04 02h Product ID LSB 12 13 14 03h Product ID MSB 25 04h Device ID LSB B3 05h Device ID MSB 0B |
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