AM79C901AJCT AMD [Advanced Micro Devices], AM79C901AJCT Datasheet - Page 64

• Manufacturer Part Number: AM79C901AJCT
• Description: HomePHY Single-Chip 1/10 Mbps Home Networking PHY
• Manufacturer: AMD [Advanced Micro Devices]

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.
Note: For these loopback paths, the data is also transmitted out of the MDI pins (TX±).
64
15:14
Bits
8:7
13
12
11
10
9
6
5
4
3
2
1
0
Force Link Good Enable
Jabber Detect Disable
Auto Receive Polarity
SQE_TEST Disable
Extended Distance
Disable Link Pulse
Correction Disable
Receive Polarity
TX_DISABLE
TX_CRS_EN
PHY Isolated
Table 1.
Reserved
Reserved
Reserved
Reversed
Reserved
Enable
Name
TBR17: 10BASE-T PHY Control/Status Register (Register 17)
1 = Link status forced to link up state
0 = Link status is determined by the device
1 = Link pulses sent from the 10BASE-T transmitter
are suppressed
0 = Link pulse enabled (normal operation)
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
1 = Disable jabber detect
0 = Enable jabber detect
1 = Receive polarity of the 10BASE-T receiver is
reversed
0 = Receive polarity is correct
1 = Polarity correction circuit is disabled for
10BASE-T
0 = Self correcting polarity circuit is enabled
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
1 = TX± outputs not active
0 = Transmit valid data
1 = CRS is asserted when transmit or receive
medium is active
0 = CRS is asserted when receive medium is active
1 = 10BASE-T PHY is isolated
0 = 10BASE-T PHY is enabled
P R E L I M I N A R Y
Am79C901A
Description
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
R
Default
Value
(hex)
00
00
0
0
0
0
0
0
0
0
0
0
0
1