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參數(shù)資料
| 型號： | AM79C875KC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | NetPHY⑩ 4LP Low Power Quad 10/100-TX/FX Ethernet Transceiver |
| 中文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP100 |
| 封裝： | 14 X 20 MM, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 14/48頁 |
| 文件大小： | 2480K |
| 代理商： | AM79C875KC |
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/J/
/K/
Preamble
SFD
Data
REF_CLK
CRS_DV
RXD[1]
RXD[0]
B
22236G-3
14
Am79C875
Note:
CRS_DV may toggle at 25 MHz starting on a nibble boundary if bits accumulate due to the difference be-
tween CRS and RX_DV. The example waveform shows a single nibble accumulated in the FIFO.
Figure 1. 100 Mbps Reception with No Errors
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REF_CLK
CRS_DV
RXD[1]
RXD[0]
False Carrier detected
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22236G-4
Figure 2. 100 Mbps Reception with False Carrier
RXD[1:0]
Receive Data [1:0]
RXD[1:0] transitions synchronously to REF_CLK.
Upon assertion of CRS_DV, the PHY will ensure that
RXD[1:0] = 00 until proper receive decoding takes
place. Then for each clock period in which CRS_DV is
asserted, RXD[1:0] transfers two bits of recovered data
from the PHY.
RXD[1:0] in 100 Mbps Mode
For normal reception following assertion of CRS_DV,
RXD[1:0] is “00” until the receiver has determined that
the receive event has a proper Start of Stream Delim-
iter (SSD), which is a /J/K/ pair. Thereafter, preamble
will appear (RXD[1:0] = 01). Data capture by MACs
occur following detection of SFD.
If False Carrier is detected (an event starting with any-
thing other than /J/K/), then RXD[1:0] is”10” until the
end of the receive event. This is a unique pattern since
False Carrier can only occur at the beginning of a
packet where a preamble will be decoded (i.e.,
RXD[1:0]=01).
RXD[1:0] in 10 Mbps Mode
Following assertion of CRS_DV, RXD[1:0] shall be “00”
until the 10BASE-T PHY has recovered clock and is
able to decode the receive data. Once valid receive
data is available from the 10BASE-T PHY, RXD[1:0]
takes on the recovered data values (i.e., starting with
“01” for preamble).
At a REF_CLK frequency of 50 MHz, the value on
RXD[1:0] is valid such that RXD[1:0] may be sampled
every tenth cycle, regardless of the starting cycle within
the group and yield the correct frame data.
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相關(guān)代理商/技術(shù)參數(shù) |
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| AM79C875KD | 制造商:Advanced Micro Devices 功能描述:PHY 4-CH 10Mbps/100Mbps 100-Pin PQR 制造商:Advanced Micro Devices 功能描述:NPD IC OPN ETHERNET TRANSCEIVER 制造商:AMD (Advanced Micro Devices) 功能描述:PHY 4-CH 10Mbps/100Mbps 100-Pin PQR |
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| AM79C875KI | 制造商:Advanced Micro Devices 功能描述:PHY 4-CH 10Mbps/100Mbps 100-Pin PQR 制造商:AMD (Advanced Micro Devices) 功能描述:PHY 4-CH 10Mbps/100Mbps 100-Pin PQR |
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