LAN9116-MD SMSC, LAN9116-MD Datasheet - Page 49
LAN9116-MD
Manufacturer Part Number
LAN9116-MD
Description
Ethernet ICs Efficient Sngl Chip 10/100 Ethrnt
Manufacturer
SMSC
Type
Single Chip MAC and PHYr
Datasheet
1.LAN9116-MT.pdf
(132 pages)
Specifications of LAN9116-MD
Ethernet Connection Type
10 Base-T, 100 Base-TX
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Product
Ethernet Controllers
Number Of Transceivers
1
Standard Supported
802.3
Data Rate
10 MB, 100 MB
Supply Voltage (max)
3.3 V
Supply Voltage (min)
0 V
Maximum Operating Temperature
+ 70 C
Package / Case
TQFP-100
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Highly Efficient Single-Chip 10/100 Non-PCI Ethernet Controller
Datasheet
SMSC LAN9116
3.12.5
3.12.6
3.12.6.1
BITS
6:3
7
2
1
0
Reserved. This bit is reserved. Always write zeros to this field to guarantee future compatibility.
Collision Count. This counter indicates the number of collisions that occurred before the packet was
transmitted. It is not valid when excessive collisions (bit 8) is also set.
Excessive Deferral. If the deferred bit is set in the control register, the setting of the excessive
deferral bit indicates that the transmission has ended because of a deferral of over 24288 bit times
during transmission.
Reserved. This bit is reserved. Always write zero to this bit to guarantee future compatibility.
Deferred. When set, this bit indicates that the current packet transmission was deferred.
Calculating Actual TX Data FIFO Usage
The following rules are used to calculate the actual TX data FIFO space consumed by a TX Packet:
Transmit Examples
TX Example 1
In this example a single, 111-Byte Ethernet packet will be transmitted. This packet is divided into three
buffers. The three buffers are as follows:
Buffer 0:
Buffer 1:
Buffer 2:
Figure 3.14, "TX Example 1" illustrates the TX command structure for this example, and also shows
how data is passed to the TX data FIFO.
TX command 'A' is stored in the TX data FIFO for every TX buffer
TX command 'B' is written into the TX data FIFO when the First Segment (FS) bit is set in TX
command 'A'
Any DWORD-long data added as part of the “Data Start Offset” is removed from each buffer before
the data is written to the TX data FIFO. Any data that is less than 1 DWORD is passed to the TX
data FIFO.
Payload from each buffer within a Packet is written into the TX data FIFO.
Any DWORD-long data added as part of the End Padding is removed from each buffer before the
data is written to the TX data FIFO. Any end padding that is less than 1 DWORD is passed to the
TX data FIFO
7-Byte “Data Start Offset”
79-Bytes of payload data
16-Byte “Buffer End Alignment”
0-Byte “Data Start Offset”
15-Bytes of payload data
16-Byte “Buffer End Alignment”
10-Byte “Data Start Offset”
17-Bytes of payload data
16-Byte “Buffer End Alignment”
DATASHEET
DESCRIPTION
49
Revision 1.5 (07-11-08)
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