LAN9215_12 Datasheet, PDF (19/144 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
NAME
Crystal 1, Clock In
Crystal 2
Reset
Table 2.5 System and Power Signals
SYMBOL
XTAL1/CLKIN
XTAL2
nRESET
BUFFER
TYPE
lCLK
OCLK
IS
(PU)
NUM
PINS
1
1
1
DESCRIPTION
External 25MHz Crystal Input. This pin can also
be connected to single-ended TTL oscillator
(CLKIN). If this method is implemented, XTAL2
should be left unconnected.
External 25MHz Crystal output.
Active-low reset input. Resets all logic and
registers within the LAN9215. This signal is
pulled high with a weak internal pull-up resistor.
If nRESET is left unconnected, the LAN9215
will rely on its internal power-on reset circuitry.
Note:
The LAN9215 must always be read at
least once after power-up, reset, or
upon return from a power-saving state
or write operations will not function.
See Section 3.10, "Detailed Reset
Description," on page 44 for additional
information
Wakeup Indicator
PME
O8/OD8
Auto-MDIX Enable
AMDIX_EN
I
(PD)
10/100 Selector
SPEED_SEL
I
(PU)
No Connect
NC
1
When programmed to do so, is asserted when
the LAN9215 detects a wake event and is
requesting the system to wake up from the
associated sleep state. The polarity and buffer
type of this signal is programmable.
Note:
Detection of a Power Management
Event, and assertion of the PME
signal will not wakeup the LAN9215.
The LAN9215will only wake up when it
detects a host write cycle (assertion of
nCS and nWR). Although any write to
the LAN9215, regardless of the data
written, will wake-up the device when
it is in a power-saving mode, it is
required that the BYTE_TEST register
be used for this purpose.
1
Enables Auto-MDIX. Pull high enable Auto-
MDIX, pull low or leave unconnected to disable
Auto-MDIX.
1
This signal functions as a configuration input on
power-up and is used to select the default
Ethernet settings. Upon deassertion of reset,
the value of the input is latched. This signal
functions as shown in Table 2.2, "Default
Ethernet Settings", below.
4
No Connect. These pins must be left open.
SMSC LAN9215
19
DATASHEET
Revision 2.9 (03-01-12)