lan9218 Standard Microsystems Corp., lan9218 Datasheet - Page 17

• Manufacturer Part Number: lan9218
• Description: Lan9218 High-performance Single-chip 10/100 Ethernet Controller With Hp Auto-mdix Support
• Manufacturer: Standard Microsystems Corp.

High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX Support
Datasheet
SMSC LAN9218
Crystal 1, Clock In
Auto-MDIX Enable
Wakeup Indicator
10/100 Selector
No Connect
(Reserved)
Pull-Down
Crystal 2
NAME
Reset
XTAL1/CLKIN
SPEED_SEL
AMDIX_EN
SYMBOL
nRESET
XTAL2
PME
NC
PD
Table 2.5 System and Power Signals
BUFFER
O8/OD8
OCLK
TYPE
lCLK
(PU)
(PD)
(PU)
IS
I
I
DATASHEET
17
NUM
PINS
1
1
1
1
1
1
4
1
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 LAN9218. This signal is
pulled high with a weak internal pull-up resistor.
If nRESET is left unconnected, the LAN9218
will rely on its internal power-on reset circuitry.
Note:
When programmed to do so, is asserted when
the LAN9218 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:
Enables Auto-MDIX. Pull high enable Auto-
MDIX, pull low or leave unconnected to disable
Auto-MDIX.
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
Ethernet
No Connect. These pins must be left open.
Reserved for internal test purposes only. This
pin should be pulled low through an external
pull-down resistor.
The LAN9218 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
Description," on page 40
information
Detection of a Power Management
Event, and assertion of the PME
signal will not wakeup the LAN9218.
The LAN9218will only wake up when it
detects a host write cycle (assertion of
nCS and nWR). Although any write to
the LAN9218, 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.
Settings", below.
Section 3.10, "Detailed Reset
DESCRIPTION
Table 2.2, "Default
Revision 2.3 (08-06-08)
for additional