2.0 General Description ........................................................................................................................................................................ 8
3.0 Pin Descriptions and Configuration ............................................................................................................................................... 10
4.0 Power Connections ....................................................................................................................................................................... 26
6.0 Clocks, Resets, and Power Management ..................................................................................................................................... 37
8.0 System Interrupts .......................................................................................................................................................................... 62
9.0 Host Bus Interface ........................................................................................................................................................................ 74
11.0 Host MAC .................................................................................................................................................................................. 139
21.0 Revision History ........................................................................................................................................................................ 417
2015 Microchip Technology Inc.
DS00001913A-page 3
LAN9250
1.0
1.1
PREFACE
General Terms
GENERAL TERMS
Description
10 Mbps Ethernet, IEEE 802.3 compliant
100 Mbps Fast Ethernet, IEEE802.3u compliant
Analog-to-Digital Converter
Address Logic Resolution
Auto-Negotiation
Baseline Wander
Buffer Manager - Part of the switch fabric
Bridge Protocol Data Unit - Messages which carry the Spanning Tree Protocol informa-
tion
8 bits
Carrier Sense Multiple Access/Collision Detect
Control and Status Registers
Counter
Destination Address
32 bits
EEPROM Controller
Frame Check Sequence - The extra checksum characters added to the end of an
Ethernet frame, used for error detection and correction.
First In First Out buffer
Finite State Machine
General Purpose I/O
External system (Includes processor, application software, etc.)
Internet Group Management Protocol
Refers to data input to the device from the host
This type of status bit is set whenever the condition that it represents is asserted. The
bit remains set until the condition is no longer true and the status bit is cleared by writ-
ing a zero.
Least Significant Bit
Least Significant Byte
Low Voltage Differential Signaling
Medium Dependent Interface
Media Independent Interface with Crossover
Media Independent Interface
Media Independent Interface Management
MAC Interface Layer
Multicast Listening Discovery
Multi-Level Transmission Encoding (3-Levels). A tri-level encoding method where a
change in the logic level represents a code bit “1” and the logic output remaining at the
same level represents a code bit “0”.
Most Significant Bit
Most Significant Byte
TABLE 1-1:
Term
10BASE-T
100BASE-TX
ADC
ALR
AN
BLW
BM
BPDU
Byte
CSMA/CD
CSR
CTR
DA
DWORD
EPC
FCS
FIFO
FSM
GPIO
Host
IGMP
Inbound
Level-Triggered Sticky Bit
lsb
LSB
LVDS
MDI
MDIX
MII
MIIM
MIL
MLD
MLT-3
msb
MSB
DS00001913A-page 4
2015 Microchip Technology Inc.
LAN9250
TABLE 1-1:
Term
NRZI
N/A
NC
OUI
Outbound
PISO
PLL
PTP
RESERVED
GENERAL TERMS (CONTINUED)
Description
Non Return to Zero Inverted. This encoding method inverts the signal for a “1” and
leaves the signal unchanged for a “0”
Not Applicable
No Connect
Organizationally Unique Identifier
Refers to data output from the device to the host
Parallel In Serial Out
Phase Locked Loop
Precision Time Protocol
Refers to a reserved bit field or address. Unless otherwise noted, reserved bits must
always be zero for write operations. Unless otherwise noted, values are not guaran-
teed when reading reserved bits. Unless otherwise noted, do not read or write to
reserved addresses.
Real-Time Clock
Source Address
Start of Frame Delimiter - The 8-bit value indicating the end of the preamble of an
Ethernet frame.
Serial In Parallel Out
Serial Management Interface
Signal Quality Error (also known as “heartbeat”)
Start of Stream Delimiter
User Datagram Protocol - A connectionless protocol run on top of IP networks
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