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LAN9217_07 参数 Datasheet PDF下载

LAN9217_07图片预览
型号: LAN9217_07
PDF下载: 下载PDF文件 查看货源
内容描述: 16位高性能单芯片10/100以太网控制器与HP Auto-MDIX的 [16-bit High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX]
分类和应用: 控制器以太网局域网(LAN)标准
文件页数/大小: 137 页 / 1566 K
品牌: SMSC [ SMSC CORPORATION ]
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16-bit High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX  
Datasheet  
Host Write  
Order  
31  
0
TX Command 'A'  
1st  
2nd  
3rd  
TX Command 'B'  
Optional offset DWORD0  
.
.
.
Optional offset DWORDn  
Offset + Data DWORD0  
.
.
.
.
.
Last Data & PAD  
Optional Pad DWORD0  
.
.
.
Last  
Optional Pad DWORDn  
Figure 3.13 TX Buffer Format  
Figure 3.13, "TX Buffer Format", shows the TX Buffer as it is written into the LAN9217. It should be  
noted that not 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 Section 3.12.5,  
"Calculating Actual TX Data FIFO Usage," on page 50 for a detailed explanation on calculating the  
actual TX data FIFO usage.  
Note 3.14 The LAN9217 host bus interface supports 16-bit bus transfers; internally, all data paths are  
32-bits wide. Figure 3.13 describes the host write ordering for pairs of atomic 16-bit  
transactions.  
3.12.2  
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 RX 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.  
Both TX command ‘A’ and TX command ‘B’ are required for each buffer in a given packet. TX  
command ‘B’ must be identical for every buffer in a given packet. If the TX command ‘B’ words do not  
match, the Ethernet controller will assert the Transmitter Error (TXE) flag.  
Revision 1.8 (06-06-07)  
46  
SMSC LAN9217  
DATASHEET