EVB9221-MINI SMSC, EVB9221-MINI Datasheet - Page 51
EVB9221-MINI
Manufacturer Part Number
EVB9221-MINI
Description
EVALUATION BOARD LAN9221-ABZJ
Manufacturer
SMSC
Datasheet
1.LAN9221-ABZJ.pdf
(152 pages)
Specifications of EVB9221-MINI
Main Purpose
Interface, Ethernet Controller (PHY and MAC)
Embedded
No
Utilized Ic / Part
LAN9221
Primary Attributes
1 Port, 100BASE-TX/10BASE-T
Secondary Attributes
16-Bit, HP Auto-MDIX, Full and Half Duplex Support, 32-Bit CRC
Processor To Be Evaluated
LAN9221
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
638-1074
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High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
SMSC LAN9221/LAN9221i
3.12.1
TX Buffer Format
TX buffers exist in the host’s memory in a given format. The host writes a TX command word into the
TX data buffer before moving the Ethernet packet data. The TX command A and command B are 32-
bit values that are used by the LAN9221/LAN9221i in the handling and processing of the associated
Ethernet packet data buffer. Buffer alignment, segmentation and other packet processing parameters
are included in the command structure. The following diagram illustrates the buffer format.
Last Buffer in
Figure 3.13 Simplified Host TX Flow Diagram
Packet
Command
DATASHEET
(optional)
available
Padding
Check
space
Buffer
Write
FIFO
Write
Write
Start
Idle
init
TX
51
TX Status
Available
Not Last Buffer
(optional)
Read TX
Status
Revision 2.7 (03-15-10)
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