ENC424J600-I/ML Microchip Technology, ENC424J600-I/ML Datasheet - Page 73

• Manufacturer Part Number: ENC424J600-I/ML
• Description: IC ETHERNET CTRLR W/SPI 44-QFN
• Manufacturer: Microchip Technology

Specifications of ENC424J600-I/ML

• Package / Case: 44-QFN
• Controller Type: Ethernet Controller
• Interface: SPI
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 96mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Input Voltage Range (max): 5.5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 3 V to 3.6 V
• Supply Current (max): 117 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164132 - BOARD DAUGHTER PICTAIL ETHERNET
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

6.0
Before discussing the use of ENC424J600/624J600
devices in Ethernet applications, it may be helpful to
review the structure of a typical data frame. For more
detailed information, refer to IEEE 802.3 Standard, which
defines the Ethernet protocol, or to Microchip Application
Note AN1120, “Ethernet Theory of Operation”.
6.1
Ethernet communications utilize a series of frames to
transmit data between nodes. (These frames are also
commonly referred to as “packets”, and in the context of
this document, the two terms will be used interchange-
ably.) Compliant Ethernet frames are between 64 and
1518 bytes long. They consist of five or six different
fields: a destination MAC address, source MAC
address, type/length field, data payload, optional
padding field and a Cyclic Redundancy Check (CRC).
Additionally, when transmitted on the Ethernet medium,
a start of stream/preamble field and a Start-Of-Frame
(SOF) delimiter byte are appended to the beginning of
the Ethernet frame. Thus, traffic seen on the twisted-pair
cabling will appear as shown in Figure 6-1.
FIGURE 6-1:
 2010 Microchip Technology Inc.
Note 1: The FCS is transmitted starting with bit 31 and ending with bit 0.
Used in the
Calculation
of the FCS
ETHERNET OVERVIEW
Frame Format
ETHERNET PACKET FORMAT
46-1500
of Bytes
Number
7
1
6
6
2
4
Start of Stream/
Type/Length
Preamble
Padding
FCS
Field
Data
SFD
DA
SA
(1)
ENC424J600/624J600
6.1.1
When using ENC424J600/624J600 devices, the start
of stream/preamble and Start-Of-Frame delimiter fields
are automatically generated for transmitted frames and
stripped from received ones. These bytes are not
written to the data buffer and the host controller does
not need to account for these bytes.
6.1.2
The destination address is a 6-byte field containing the
MAC address of the device to which the frame is
directed. If the Least Significant bit in the first byte of
this address is clear (i.e., the first byte of the address is
even), the address is a Unicast address. For example,
00-00-BA-BE-F0-0D and 32-45-DE-AD-BE-EF Unicast
addresses,
33-45-DE-AD-BE-EF are not. Frames with a Unicast
destination are designated for usage by the addressed
node only.
Filtered Out by the Module
Start-Of-Frame Delimiter
(filtered out by the module)
Destination Address,
such as Multicast, Broadcast or Unicast
Source Address
Type of Packet or the Length of the Packet
Packet Payload
(with optional padding)
Frame Check Sequence – CRC
START OF STREAM/PREAMBLE
AND START-OF-FRAME DELIMITER
DESTINATION ADDRESS
while
Comments
01-00-BA-BE-F0-0D
DS39935C-page 71
and