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LAN9512i-JZX Datasheet(PDF) 11 Page - SMSC Corporation |
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LAN9512i-JZX Datasheet(HTML) 11 Page - SMSC Corporation |
11 / 51 page USB 2.0 Hub and 10/100 Ethernet Controller Datasheet SMSC LAN9512/LAN9512i 11 Revision 1.2 (02-29-12) DATASHEET 1 Ethernet Link Activity Indicator LED nLNKA_LED OD12 (PU) This pin is driven low (LED on) when a valid link is detected. This pin is pulsed high (LED off) for 80mS whenever transmit or receive activity is detected. This pin is then driven low again for a minimum of 80mS, after which time it will repeat the process if TX or RX activity is detected. Effectively, LED2 is activated solid for a link. When transmit or receive activity is sensed, LED2 will function as an activity indicator. General Purpose I/O 1 GPIO1 IS/O12/ OD12 (PU) This General Purpose I/O pin is fully programmable as either a push-pull output, an open-drain output, or a Schmitt-triggered input. 1 Ethernet Speed Indicator LED nSPD_LED OD12 (PU) This pin is driven low (LED on) when the Ethernet operating speed is 100Mbs, or during auto- negotiation. This pin is driven high during 10Mbs operation, or during line isolation. General Purpose I/O 2 GPIO2 IS/O12/ OD12 (PU) This General Purpose I/O pin is fully programmable as either a push-pull output, an open-drain output, or a Schmitt-triggered input. 1 General Purpose I/O 3 GPIO3 IS/O8/ OD8 (PU) This General Purpose I/O pin is fully programmable as either a push-pull output, an open-drain output, or a Schmitt-triggered input. 1 General Purpose I/O 4 GPIO4 IS/O8/ OD8 (PU) This General Purpose I/O pin is fully programmable as either a push-pull output, an open-drain output, or a Schmitt-triggered input. 1 General Purpose I/O 5 GPIO5 IS/O8/ OD8 (PU) This General Purpose I/O pin is fully programmable as either a push-pull output, an open-drain output, or a Schmitt-triggered input. 1 General Purpose I/O 6 GPIO6 IS/O8/ OD8 (PU) This General Purpose I/O pin is fully programmable as either a push-pull output, an open-drain output, or a Schmitt-triggered input. 1 General Purpose I/O 7 GPIO7 IS/O8/ OD8 (PU) This General Purpose I/O pin is fully programmable as either a push-pull output, an open-drain output, or a Schmitt-triggered input. 1 Detect Upstream VBUS Power VBUS_DET IS_5V This pin detects the state of the upstream bus power. The Hub monitors VBUS_DET to determine when to assert the USBDP0 pin's internal pull-up resistor (signaling a connect event). For bus powered hubs, this pin must be tied to VDD33IO. For self powered hubs where the device is permanently attached to a host, VBUS_DET should be pulled to VDD33IO. For other self powered applications, refer to the device reference schematic for additional connection information. 1 Auto-MDIX Enable AUTOMDIX_EN IS Determines the default Auto-MDIX setting. 0 = Auto-MDIX is disabled. 1 = Auto-MDIX is enabled. Table 2.3 Miscellaneous Pins (continued) NUM PINS NAME SYMBOL BUFFER TYPE DESCRIPTION |
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