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LAN9215I-MT 参数 Datasheet PDF下载

LAN9215I-MT图片预览
型号: LAN9215I-MT
PDF下载: 下载PDF文件 查看货源
内容描述: 高效的单芯片10/100以太网控制器与HP Auto-MDIX的和工业温度支持 [Highly Efficient Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support]
分类和应用: 外围集成电路数据传输控制器局域网以太网局域网(LAN)标准时钟
文件页数/大小: 134 页 / 1602 K
品牌: SMSC [ SMSC CORPORATION ]
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Highly Efficient Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support  
Datasheet  
5.3.9.1  
Allowable settings for Configurable FIFO Memory Allocation  
TX and RX FIFO space is configurable through the CSR - HW_CFG register defined above. The user  
must select the FIFO allocation by setting the TX FIFO Size (TX_FIF_SZ) field in the hardware  
configuration (HW_CFG) register. The TX_FIF_SZ field selects the total allocation for the TX data path,  
including the TX Status FIFO size. The TX Status FIFO size is fixed at 512 Bytes (128 TX Status  
DWORDs). The TX Status FIFO length is subtracted from the total TX FIFO size with the remainder  
being the TX data FIFO Size. Note that TX data FIFO space includes both commands and payload  
data.  
RX FIFO Size is the remainder of the unallocated FIFO space (16384 bytes – TX FIFO Size). The RX  
Status FIFO size is always equal to 1/16 of the RX FIFO Size. The RX Status FIFO length is subtracted  
from the total RX FIFO size with the remainder being the RX data FIFO Size.  
For example, if TX_FIF_SZ = 6 then:  
Total TX FIFO Size = 6144 Bytes (6KB)  
TX Status FIFO Size = 512 Bytes (Fixed)  
TX Data FIFO Size = 6144 – 512 = 5632 Bytes  
RX FIFO Size = 16384 – 6144 = 10240 Bytes (10KB)  
RX Status FIFO Size = 10240 / 16 = 640 Bytes (160 RX Status DWORDs)  
RX Data FIFO Size = 10240 – 640 = 9600 Bytes  
Table 5.3 shows every valid setting for the TX_FIF_SZ field. Note that settings not shown in this table  
are reserved and should not be used.  
Note: The RX data FIFO is considered full 4 DWORDs before the length that is specified in the  
HW_CFG register.  
Table 5.3 Valid TX/RX FIFO Allocations  
TX DATA FIFO  
SIZE (BYTES)  
TX STATUS FIFO  
SIZE (BYTES)  
RX DATA FIFO  
SIZE (BYTES)  
RX STATUS FIFO  
SIZE (BYTES)  
TX_FIF_SZ  
2
3
1536  
2560  
3584  
4608  
5632  
6656  
7680  
8704  
9728  
10752  
11776  
12800  
13824  
512  
512  
512  
512  
512  
512  
512  
512  
512  
512  
512  
512  
512  
13440  
12480  
11520  
10560  
9600  
8640  
7680  
6720  
5760  
4800  
3840  
2880  
1920  
896  
832  
768  
704  
640  
576  
512  
448  
384  
320  
256  
192  
128  
4
5
6
7
8
9
10  
11  
12  
13  
14  
SMSC LAN9215I  
Revision 1.5 (07-18-06)  
DATA8S3HEET  
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