LAN9311-NZW Standard Microsystem (Smsc), LAN9311-NZW Datasheet - Page 125
LAN9311-NZW
Manufacturer Part Number
LAN9311-NZW
Description
Ethernet Switch 2-Port 10Mbps/100Mbps 128-Pin XVTQFP
Manufacturer
Standard Microsystem (Smsc)
Datasheet
1.LAN9311-NU.pdf
(460 pages)
Specifications of LAN9311-NZW
Package
128XVTQFP
Phy/transceiver Interface
MII
Number Of Primary Switch Ports
2
Maximum Data Rate
100 Mbps
Internal Memory Buffer Size
32 KB
Vlan Support
Yes
Power Supply Type
Analog
Minimum Single Supply Voltage
3 V
Maximum Single Supply Voltage
3.6 V
Maximum Supply Current
0.295 A
Maximum Power Dissipation
1070 mW
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Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9311/LAN9311i
9.8.1
9.8.2
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 LAN9311/LAN9311i 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 buffer format is illustrated in
Figure 9.4
all of the data shown in this diagram is actually stored in the TX Data FIFO. This must be taken into
account when calculating the actual TX Data FIFO usage. Please refer to
Actual TX Data FIFO Usage"
TX Command Format
The TX command instructs the TX FIFO controller on handling the subsequent buffer. The command
precedes the data to be transmitted. The TX command is divided into two, 32-bit words; TX command
‘A’ and TX command ‘B’.
There is a 16-bit Packet Tag in the TX command ‘B’ command word. Packet Tags may, if host software
desires, be unique for each packet (i.e., an incrementing count). The value of the tag will be returned
in the TX status word for the associated packet. The Packet tag can be used by host software to
uniquely identify each status word as it is returned to the host.
shows the TX Buffer as it is written into the LAN9311/LAN9311i. It should be noted that not
Host Write
Order
2nd
3rd
Last
1st
Figure 9.4 TX Buffer Format
for a detailed explanation on calculating the actual TX Data FIFO usage.
31
Offset + Data DWORD0
Optional offset DWORD0
Optional offset DWORDn
DATASHEET
Optional Pad DWORD0
Optional Pad DWORDn
TX Command 'A'
TX Command 'B'
Last Data & PAD
125
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0
Figure
Section 9.8.5, "Calculating
9.4.
Revision 1.7 (06-29-10)
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