參數(shù)資料
型號(hào)： 21440
廠商： Intel Corp.
英文描述： Multiport 10/100Mb/s Ethernet Controller(多端口10/100Mb/s 以太網(wǎng)控制器)
中文描述： 多端口10/100Mb/s以太網(wǎng)控制器（多端口支持10/100Mbps以太網(wǎng)控制器）
文件頁數(shù)： 51/92頁
文件大?。?/td> 1352K
代理商： 21440
21440 Multiport 10/100Mb/s Ethernet Controller
4-5
FIFO Interface Operation
4.3
Packet Reception
The following sections describe the packet reception policy.
4.3.1
Packet Storing
Packets received from the network are loaded into the receive FIFO. Received packets are
transferred from the receive FIFO onto the FIFO bus during burst accesses. To indicate the minimal
amount of data available in the receive FIFO, the rxrdy signal is asserted according to a
programmable threshold (FFO_TSHD<RTH>). If the end of a packet is loaded onto the FIFO, the
rxrdy signal is asserted even if the amount of data available is below the threshold value.
The fbe_l[7:0] signals are used to report which bytes driven onto the bus are valid. For example,
they indicate which bytes are valid in the last bus transfer of a packet.
The first packet data is signalled with the sop signal, while the last data is signalled with the eop
signal. Following the last data transfer of a received packet, a field describing the packet status is
driven on the data bus, reporting the status of the packet and its length. The packet status is driven on
the FIFO bus according to the description in
Table 4-5
. In 64-bit FIFO bus mode, the byte enables for
the status word will report all eight data bytes as valid (fbe_l<7:0>=00h). In 32-bit FIFO bus mode,
the lower four bytes are valid (fbe_l<7:0>=f0h). Further reads from the receive FIFO during the same
access are ignored to prevent transfer of the next packet in the same burst. The byte enables for these
additional read transactions will report that all bytes contain invalid data (fbe_l<7:0>=ffh). If the
21440 is programmed to remove CRC (RX_PARAM<CRCR>), the last four bytes of the packet will
not be transferred on the FIFO bus, and eop will be asserted on the packet
’
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PDF描述
21446 Net186-EVAL-KT? 24.9KB (PDF)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
2-1440000-2 制造商:TE Connectivity 功能描述:relay, OMR-C-105H,V000
2-1440000-3 功能描述:低信號(hào)繼電器 - PCB OMR-C-105H V300 RoHS:否 制造商:NEC 觸點(diǎn)形式:2 Form C (DPDT-BM) 觸點(diǎn)電流額定值: 線圈電壓:5 V 最大開關(guān)電流:1 A 線圈電流:1 A 線圈類型:Non-Latching 功耗:140 mW 端接類型:SMT 絕緣: 介入損耗:
2-1440000-5 功能描述:低信號(hào)繼電器 - PCB OMR-C-109H V530 RoHS:否 制造商:NEC 觸點(diǎn)形式:2 Form C (DPDT-BM) 觸點(diǎn)電流額定值: 線圈電壓:5 V 最大開關(guān)電流:1 A 線圈電流:1 A 線圈類型:Non-Latching 功耗:140 mW 端接類型:SMT 絕緣: 介入損耗:
2-1440000-6 制造商:TE Connectivity 功能描述:Electromechanical Relay SPST-NO 0.5A 12VDC 1.05KOhm Through Hole 制造商:TE Connectivity 功能描述:EM RLY SPST-NO 0.5A 12VDC 1.05KOHM TH - Bulk 制造商:TE Connectivity 功能描述:RELAY REED SPST 500MA 12V
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