LAN9312-NZW Standard Microsystems (SMSC), LAN9312-NZW Datasheet - Page 130
LAN9312-NZW
Manufacturer Part Number
LAN9312-NZW
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.LAN9312-NZW.pdf
(458 pages)
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Revision 1.7 (06-29-10)
9.8.6.2
TX Command 'A'
Buffer End Alignment = 0
Data Start Offset = 6
First Segment = 1
Last Segment = 1
Buffer Size =183
TX Command 'B'
Packet Length = 183
TX Example 2
In this example, a single 183-Byte Ethernet packet will be transmitted. This packet is in a single buffer
as follows:
Figure 9.6
to the TX Data FIFO. Note that the packet resides in a single TX Buffer, therefore both the FS and LS
bits are set in TX command ‘A’.
2-Byte “Data Start Offset”
183-Bytes of payload data
4-Byte “Buffer End Alignment”
illustrates the TX command structure for this example, and also shows how data is passed
31
Data Written to the
TX Data FIFO Port
6-Byte Data Start Offset
183-Byte Payload Data
Memory Mapped
TX Command 'A'
TX Command 'B'
3B End Padding
High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Figure 9.6 TX Example 2
DATASHEET
130
0
NOTE: Extra bytes between buffers
are not transmitted
Data Passed to the
183-Byte Payload Data
TX Data FIFO
TX Command 'A'
TX Command 'B'
SMSC LAN9312
Datasheet
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