LAN9215I_07 Datasheet, PDF (18/138 Pages) SMSC Corporation – Highly Efficient Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support

Highly Efficient Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support
Datasheet
NAME
Crystal 1, Clock In
Crystal 2
Reset
Wakeup Indicator
Auto-MDIX Enable
10/100 Selector
No Connect
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 LAN9215i. This signal is
pulled high with a weak internal pull-up resistor.
If nRESET is left unconnected, the LAN9215i
will rely on its internal power-on reset circuitry.
PME
O8/OD8
AMDIX_EN
SPEED_SEL
I
(PD)
I
(PU)
NC
Note:
The LAN9215i 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 41 for additional
information
1
When programmed to do so, is asserted when
the LAN9215i 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 LAN9215i.
The LAN9215i will only wake up when
it detects a host write cycle (assertion
of nCS and nWR). Although any write
to the LAN9215i, 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.
Revision 1.93 (12-12-07)
18
DATASHEET
SMSC LAN9215i