參數(shù)資料
型號(hào): GCIXF1002ED
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器雜項(xiàng)-數(shù)據(jù)表參考
文件頁數(shù): 70/128頁
文件大?。?/td> 1262K
代理商: GCIXF1002ED
Intel
IXF1002 Dual Port Gigabit Ethernet Controller
70
Datasheet
The packet header may also be read from the receive FIFO for processing without removing it from
the FIFO. If the IXF1002 is programmed to work in the header replay mode
(TX_RX_PARAM<HRPL>), the packet header will be transferred twice onto the IX Bus: first time
for header processing and second time with the packet transfer.
4.3.3
Packet Segmentation
The IXF1002 supports receive-packet segmentation on any byte boundary. When the rxkep signal
is asserted on the last data transfer of a burst, the same data will be transferred as the first data word
of the next burst.
The rxkep signal is ignored when it is asserted in one of the following cases: invalid data, last data
of the packet, or last data of the header on header replay mode (TX_RX_PARAM<HRPL>).
Packets may be split to multiple buffers, as in the following example.
rxkep is asserted on the last cycle of a three octal word burst from the IXF1002, causing the third
octal word to be retained in the receive FIFO. During the next receive burst, this same octal word
will be driven as the first data word of the burst. Masking of data bytes to the buffers is performed
by the host. In the following example, the host places bytes 1
19 in the first buffer (as result of the
first burst, which are bytes 1
24). And bytes 20
28 in the second buffer (as a result of the second
burst, which are bytes 17
24).
Buffer 1:
Buffer 2:
A5466-01
B8
B16 B15 B14 B13 B12 B11 B10 B9
B7
B6
B5
X
X
X
X
X
B19 B18 B17
B4
B3
B2
B1
A5467-01
B24
X
X
X
X
B28 B27 B26 B25
B23 B22 B21 B20
X
X
X
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