LAN89218AQ SMSC, LAN89218AQ Datasheet - Page 58

• Manufacturer Part Number: LAN89218AQ
• Description: Ethernet ICs High Perform Chip 10/100 NonPCI Cntrl
• Manufacturer: SMSC

Specifications of LAN89218AQ

• Ethernet Connection Type: 10BASE-T, 100BASE-TX
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Product: Ethernet Controllers
• Standard Supported: IEEE802.3, IEEE802.3u
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Maximum Operating Temperature: + 85 C
• Package / Case: TQFP-100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Revision 1.3 (02-23-10)
3.12.2.2
31:16
BITS
BITS
10:0
10:0
15
14
13
12
11
TX Command ‘B’
Buffer Size (bytes). This field indicates the number of bytes contained in the buffer following this
command. This value, along with the Buffer End Alignment field, is read and checked by the
LAN89218 and used to determine how many extra DWORD’s were added to the end of the Buffer.
A running count is also maintained in the LAN89218 of the cumulative buffer sizes for a given packet.
This cumulative value is compared against the Packet Length field in the TX command ‘B’ word and
if they do not correlate, the TXE flag is set.
Note: The buffer size specified does not include the buffer end alignment padding or data start offset
Packet Tag. The host should write a unique packet identifier to this field. This identifier is added to
the corresponding TX status word and can be used by the host to correlate TX status words with
their corresponding packets.
Note: The use of packet tags is not required by the hardware. This field can be used by the LAN
Reserved. This bit is reserved. Always write zeros to this bit to guarantee future compatibility.
TX Checksum Enable (CK). When this bit is set in conjunction with the first segment (FS) bit in TX
Command ‘A’ and the TX checksum offload engine enable bit (TXCOE_EN) in the
COE_CR—Checksum Offload Engine Control
will calculate a L3 checksum for the associated frame.
Add CRC Disable. When set, the automatic addition of the CRC is disabled.
Disable Ethernet Frame Padding. When set, this bit prevents the automatic addition of padding to
an Ethernet frame of less than 64 bytes. The CRC field is also added despite the state of the Add
CRC Disable field.
Reserved. These bits are reserved. Always write zeros to this field to guarantee future compatibility.
Packet Length (bytes). This field indicates the total number of bytes in the current packet. This
length does not include the offset or padding. If the Packet Length field does not match the actual
number of bytes in the packet the Transmitter Error (TXE) flag will be set.
added to a buffer.
software driver for any application. Packet Tags is one application example.
Table 3.13 TX Command 'A' Format (continued)
Table 3.14 TX Command 'B' Format
High Performance Single-Chip 10/100 Ethernet Controller for Automotive Applications
DATASHEET
DESCRIPTION
DESCRIPTION
58
Register, the TX checksum offload engine (TXCOE)
SMSC LAN89218
Datasheet