LAN9221 Datasheet, PDF (16/151 Pages) SMSC Corporation – High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O

2.1
Pin List
NAME
Host Data
Host Address
Read Strobe
Write Strobe
SYMBOL
D[15:0]
A[7:1]
nRD
nWR
Chip Select
nCS
Interrupt
Request
FIFO Select
IRQ
FIFO_SEL
High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
Table 2.1 Host Bus Interface Signals
BUFFER
#
TYPE PINS
DESCRIPTION
VIS/VO8 16 Bi-directional data port.
VIS
7 7-bit Address Port. Used to select Internal CSR’s and
TX and RX FIFOs.
VIS
1 Active low strobe to indicate a read cycle.
VIS
1 Active low strobe to indicate a write cycle. This signal,
qualified with nCS, is also used to wakeup the
LAN9221/LAN9221i when it is in a reduced power
state.
VIS
1 Active low signal used to qualify read and write
operations. This signal qualified with nWR is also used
to wakeup the LAN9221/LAN9221i when it is in a
reduced power state.
VO8/
VOD8
1 Programmable Interrupt request. Programmable
polarity, source and buffer types.
VIS
1 When driven high all accesses to the
LAN9221/LAN9221i are to the RX or TX Data FIFOs.
In this mode, the A[7:3] upper address inputs are
ignored.
NAME
TPO+
TPO-
TPI+
TPI-
PHY External Bias
Resistor
SYMBOL
TPO+
TPO-
TPI+
TPI-
EXRES
Table 2.2 LAN Interface Signals
BUFFER
TYPE
AO
AO
AI
AI
AI
NUM
PINS
1
1
1
1
1
DESCRIPTION
Transmit Positive Output (normal)
Receive Positive Input (reversed)
Transmit Negative Output (normal)
Receive Negative Input (reversed)
Receive Positive Input (normal)
Transmit Positive Input (reversed)
Receive Negative Input (normal)
Transmit Negative Output (reversed)
Must be connected to ground through a 12.4K
ohm 1% resistor.
Note: The pin names for the twisted pair pins shown above apply to a normal connection. If HP Auto-
MDIX is enabled and a reverse connection is detected, or a reverse connection is manually
selected, the input pins become outputs, and vice-versa, as indicated in the descriptions.
Revision 2.6 (12-04-08)
16
DATASHEET
SMSC LAN9221/LAN9221i