LAN9215_12 Datasheet, PDF (22/144 Pages) SMSC Corporation – 16-bit Non-PCI 10/100 Ethernet Controller with HP Auto-MDIX Support

16-bit Non-PCI 10/100 Ethernet Controller with HP Auto-MDIX Support
Datasheet
Table 2.6 MII Interface Signals
NAME
SYMBOL
BUFFER
TYPE
NUM
PINS
DESCRIPTION
Management Data
IO/External PHY
Detect
MDIO
(EXT_PHY_DET)
I/O8
(PD)
1
Management Data IO: When SMI_SEL = 1,
this pin is the MII SMI serial IO bus pin.
External PHY Detect: This pin also functions
as a strap input, which can be used to indicate
the presence of an external PHY.
Note:
See Section 5.3.9,
"HW_CFG—Hardware Configuration
Register" for more information on
SMI_SEL and EXT_PHY_DET
Management Data
Clock
MDC
O8
(PD)
1
Management Data Clock: When SMI_SEL = 1,
this pin is the MII management data clock.
When SMI_SEL=0, this pin is driven low.
Note:
See Section 5.3.9,
"HW_CFG—Hardware Configuration
Register" for more information on
SMI_SEL.
Note 2.2
Pins RXD[3:1] provide internal pull-down resistors to prevent these pins from floating when
unused. RXD0 (pin 75) does not provide an internal pull-down resistor. This pin must be
pulled or driven to a valid state at all times.
Note 2.3 The external SMI port is selected when SMI_SEL = 1. When SMI_SEL = 0, MDIO is tri-
stated and MDC is driven low.
Revision 2.9 (03-01-12)
22
DATASHEET
SMSC LAN9215