LAN9218I_12 Datasheet, PDF (17/134 Pages) SMSC Corporation – High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support

High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature 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 LAN9218i. This signal is
pulled high with a weak internal pull-up resistor.
If nRESET is left unconnected, the LAN9218i
will rely on its internal power-on reset circuitry.
Note:
The LAN9218i 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 40 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
Pull-Down
PD
(Reserved)
1
When programmed to do so, is asserted when
the LAN9218i 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 LAN9218i.
The LAN9218iwill only wake up when
it detects a host write cycle (assertion
of nCS and nWR). Although any write
to the LAN9218i, 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.
1
Reserved for internal test purposes only. This
pin should be pulled low through an external
pull-down resistor.
SMSC LAN9218i
17
DATASHEET
Revision 2.9 (03-01-12)