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| 型號(hào)： | HOME |
| 英文描述： | Home PHY Single-Chip 1/10Mbps Home Networking PHY? - (PDF) |
| 中文描述： | 首頁(yè)P(yáng)HY的單芯片1/10Mbps家庭網(wǎng)絡(luò)物理層？ - （PDF格式） |
| 文件頁(yè)數(shù)： | 64/90頁(yè) |
| 文件大小： | 743K |
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64
Am79C901A
P R E L I M I N A R Y
TBR17: 10BASE-T PHY Control/Status Register (Register 17)
This register is used to control the configuration of the 10
Mbps PHY of the Am79C901A home networking device.
See Table 1.
Table 1.
TBR17: 10BASE-T PHY Control/Status Register (Register 17)
Note:
For these loopback paths, the data is also transmitted out of the MDI pins (TX±).
Bits
Name
Description
Read/Write
Default
Value
(hex)
15:14
Reserved
R
00
13
Force Link Good Enable
1 = Link status forced to link up state
0 = Link status is determined by the device
R/W
0
12
Disable Link Pulse
1 = Link pulses sent from the 10BASE-T transmitter
are suppressed
0 = Link pulse enabled (normal operation)
R/W
0
11
SQE_TEST Disable
1 = Disables the SQE heartbeat which occurs after
each 10BASE-T transmission
0 = The heartbeat assertion occurs on the COL pin
approximately 1 μs after transmission and for a
duration of 1 μs
R/W
0
10
Reserved
R
0
9
Jabber Detect Disable
1 = Disable jabber detect
0 = Enable jabber detect
R/W
0
8:7
Reserved
R
00
6
Receive Polarity
Reversed
1 = Receive polarity of the 10BASE-T receiver is
reversed
0 = Receive polarity is correct
R
0
5
Auto Receive Polarity
Correction Disable
1 = Polarity correction circuit is disabled for
10BASE-T
0 = Self correcting polarity circuit is enabled
R/W
0
4
Extended Distance
Enable
1 = 10BASE-T receive squelch thresholds are
reduced to allow reception of frames which are
greater than 100 meters
0 = Squelch thresholds are set for standard distance
of 100 meters
R/W
0
3
TX_DISABLE
1 = TX± outputs not active
0 = Transmit valid data
R/W
0
2
TX_CRS_EN
1 = CRS is asserted when transmit or receive
medium is active
0 = CRS is asserted when receive medium is active
R/W
0
1
Reserved
R
0
0
PHY Isolated
1 = 10BASE-T PHY is isolated
0 = 10BASE-T PHY is enabled
R
1
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