USB2514B-AEZG Standard Microsystems (SMSC), USB2514B-AEZG Datasheet - Page 34

• Manufacturer Part Number: USB2514B-AEZG
• Description: USB CHIP
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB2514B-AEZG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Revision 1.1 (04-26-10)
8.1.2.1
8.1.3
8.2
CFG_SEL[2]
1
1
1
1
Note: When the CFG_SEL[2] pin is unavailable, then the logic is internally tied to ‘0’.
Power Switching Polarity
When the PRTPWR_POL pin is unavailable (3 and 4 port, 48-pin packages only), the hub only
supports “active high” port power controllers.
VBus Detect
According to Section 7.2.1 of the USB 2.0 specification, a downstream port can never provide power
to its D+ or D- pull-up resistors unless the upstream port’s VBUS is in the asserted (powered) state.
The VBUS_DET pin on the hub monitors the state of the upstream VBUS signal and will not pull-up
the D+ resistor if VBUS is not active. If VBUS goes from an active to an inactive state (Not Powered),
the hub will remove power from the D+ pull-up resistor within 10 seconds.
The SMSC hub can be configured via a 2-wire (I
Configuration Options"
The internal state-machine will (when configured for EEPROM support) read the external EEPROM for
configuration data. The hub will then “attach” to the upstream USB host.
Note: The hub does not have the capacity to write, or “Program,” an external EEPROM. The hub
EEPROM Interface
CFG_SEL[1]
only has the capability to read external EEPROMs. The external eeprom will be read (even if
it is blank or non-populated), and the hub will be “configured” with the values that are read.
0
0
1
1
Table 8.1 Hub Configuration Options (continued)
CFG_SEL[0]
for specific details on how to enable configuration via an I
0
1
0
1
DATASHEET
Internal Default Configuration with the following over-rides
Internal Default Configuration with the following over-rides
Internal Default Configuration with the following over-rides
Internal Default Configuration with the following over-rides
Strap options disabled
LED mode = USB (when available on package)
Ganged port power switching
Ganged over-current sensing
Dynamic power-switching enabled
Strap options disabled
LED mode = Speed (when available on package)
Individual power switching
Individual over-current sensing
Dynamic power-switching enabled
Strap options disabled
LED mode = USB (when available on package)
Individual power switching
Individual over-current sensing
Strap options disabled
LED mode = Speed (when available on package)
Individual power switching
Individual over-current sensing
34
2
C) EEPROM (256x8). (Please see
DESCRIPTION
USB 2.0 Hi-Speed Hub Controller
2
C EEPROM).
Table 8.1, "Hub
SMSC USB251x
Datasheet