EVB9311 SMSC, EVB9311 Datasheet - Page 131

• Manufacturer Part Number: EVB9311
• Description: EVALUATION BOARD LAN9311-NU
• Manufacturer: SMSC
• Series: 0133r

Specifications of EVB9311

• Main Purpose: Interface, Ethernet
• Embedded: No
• Utilized Ic / Part: LAN9311
• Primary Attributes: 2 Ports, 100BASE-TX/10BASE-T, Managed
• Secondary Attributes: 2 PHYs with HP Auto-MDIX, Auto- Flow Control, 32-bit CRC, MDI/MDI-X
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1076

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9311/LAN9311i
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
Figure 9.6 TX Example 2
DATASHEET
131
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'
Revision 1.7 (06-29-10)