High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX & Industrial Temperature Support
Datasheet
Table 2.1 Host Bus Interface Signals
BUFFER
TYPE
#
PIN NO.
NAME
SYMBOL
PINS
DESCRIPTION
Bi-directional data port.
21-26,29-
33,36-40
Host Data High
D[31:16]
I/O8 (PD)
16
16
Note that Pull-down’s are disabled in
32 bit mode.
43-46,49-
53,56-59,62-
64
Host DataLow
D[15:0]
I/O8
Bi-directional data port. Supports
Big/Little Endian Byte ordering.
12-18
Host Address
Read Strobe
Write Strobe
A[7:1]
nRD
IS
IS
IS
7
1
1
7-bit Address Port. Used to select
Internal CSR’s and TX and RX FIFOs.
92
Active low strobe to indicate a read
cycle.
93
nWR
Active low strobe to indicate a write
cycle. This signal, qualified with nCS, is
also used to wakeup the LAN9218I
when it is in a reduced power state.
94
72
Chip Select
nCS
IRQ
IS
1
1
Active low signal used to qualify read
and write operations. This signal
qualified with nWR is also used to
wakeup the LAN9218I when it is in a
reduced power state.
Interrupt
Request
O8/OD8
Programmable Interrupt request.
Programmable polarity, source and
buffer types.
71,75,84,90,
91
Reserved
Reserved
5
1
No Connect
73
AutoMDIX
Enable
AMDIX_EN
I (PD)
I (PU)
Enables Auto-MDIX. Pull high to
enable Auto-MDIX, pull low or leave
unconnected to disable Auto-MDIX.
74
10/100
Selector
SPEED_SEL
FIFO_SEL
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.
76
FIFO Select
IS
1
When driven high all accesses to the
LAN9218I are to the RX or TX Data
FIFOs. In this mode, the A[7:3] upper
address inputs are ignored.
Table 2.2 Default Ethernet Settings
DEFAULT ETHERNET SETTINGS
DUPLEX
SPEED_SEL
SPEED
AUTO NEG.
0
1
10Mbps
Half-Duplex
Half-Duplex
Disabled
Enabled
100Mbps
SMSC LAN9218I
Revision 1.5 (07-18-06)
DATA1S5HEET
SMSC [ SMSC CORPORATION ]
