參數(shù)資料
型號(hào): LXT9781HC
英文描述: LAN TRANSCEIVER|OCTAL|QFP|208PIN|PLASTIC
中文描述: 網(wǎng)絡(luò)收發(fā)器|八路| QFP封裝| 208PIN |塑料
文件頁(yè)數(shù): 32/68頁(yè)
文件大小: 1177K
代理商: LXT9781HC
LXT9784
Low-Power Octal PHY
32
Datasheet
2.3.1.8
100BASE-TX Receive Error Detection and Reporting
In 100BASE-TX mode, the PHYs detect errors in the receive data in a number of ways. Any of the
following conditions is considered an error:
If the SSD ("JK") symbol is not fully detected after idle
If an invalid symbol is detected at the 4B/5B decoder
If IDLE is detected in the middle of a frame (before "TR" symbol pair are detected)
When any of the above error conditions occurs, the PHY immediately indicates a receive error for
reception. In RMII mode the PHY asserts RXER
n
, and in SMII mode the PHY asserts the RXD_0
status bit.
Figure 5. RMII Data Reception
Figure 6. False Carrier Detect
Table 12. SMII RXD_[7:0] Contents
CRS
RX_DV
RXD0
RXD1
RXD2
RXD3
RXD4
RXD5
RXD6
RXD7
X
O
receive error
status, from
previous frame
Speed
0 = 10Mbps
1=100Mbps
Duplex
0=down
1 = up
Link
0=down
1 = up
Jabber
0 =OK
1=error
Upper Nibble
0 = invalid
1 = valid
False Carrier
Detect
1
X
1
One Data Byte (two MII data nibbles)
CRSDV_n
MCLK
RXD1_n
Preamble
SFD
Data
∫∫
∫∫
RXD0_n
0
0
0
0
0
0
0
0
1
x
x
x
x
x
0
0
0
0
0
0
0
0
1
1
1
1
1
1
x
x
x
x
x
0
0
0
0
0
∫∫
∫∫
∫∫
∫∫
CRSDV_n
MCLK
RXD1_n
False Carrier detected
∫∫
∫∫
RXD0_n
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
∫∫
∫∫
∫∫
∫∫
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