USB2514B-AEZC Ver la hoja de datos (PDF) - Microchip Technology
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USB2514B-AEZC Datasheet PDF : 57 Pages
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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.
Note: See Chapter 11 (Hub Specification) of the USB specification for general details regarding hub operation
and functionality.
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).
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
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.
Default ROM Values
(Hexidecimal)
Address
Register Name
00h
Vendor ID LSB
01h
Vendor ID MSB
02h
Product ID LSB
03h
Product ID MSB
04h
Device ID LSB
05h
Device ID MSB
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DS00001692C-page 19
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