AM79C978 Advanced Micro Devices, AM79C978 Datasheet - Page 187

• Manufacturer Part Number: AM79C978
• Description: Single-Chip 1/10 Mbps PCI Home Networking Controller
• Manufacturer: Advanced Micro Devices

HPR29: HomePNA PHY TX Control (Register 29)
HPR30: 1 Mbps HomePNA PHY Drive Level Control
Test Register (Register 30)
HPR31: 1 Mbps HomePNA PHY Analog Control
Register (Register 31)
Note: 1. Writes to these bits will cause undefined functionality.
15:12
15:11
Bits
15:8
Bits
Bits
10:8
11:6
7:4
3:0
5:0
6:0
7
TX_CTRL
TX_PULSE_WIDTH
TX_PULSE_CYCLES_N
TX_PULSE_CYCLES_P
RES
High Level Control
Low Level Control
Level_Adjust
Reserved
Force_Link_Valid
Reserved
Table 62. HPR30: HomePNA PHY Drive Level Control Test Register (Register 30)
Table 63. HPR31: HomePNA PHY Analog Control Register (Register 31)
Mnemonic
Mnemonic
Mnemonic
Table 61. HPR29: HomePNA PHY TX Control (Register 29)
This value defines the duration of a transmit
pulse in OSC cycles (16.7 ns). This will
effectively determine the transmit spectrum of
the PHY.
This value defines the number of pulses that
will be driven onto the HRTXRX_N pin.
This value defines the number of pulses that
will be driven onto the HRTXRX_P pin.
Reserved; Write = 0; Read = X
Defines the drive level that will be utilized in the
High Power mode.
Defines the drive level that will be utilized in the
Low Power mode.
Global output slope adjustment. These bits
control the number of current sources enable
for transmit. Each bit represents a single
current source. Thus 10101 enables three
current sources as does 11100.
Reserved; Write = 0
1 = Link Status bit will be held valid
0 = Normal operation
Reserved; Write = 0
Am79C978
Description
Description
Description
Read/
Read/
Read/
Write
Write
Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
Default
Default
Default
Hex
Hex
Hex
YX
04
15
09
18
4
4
0
0
0
Reset
Reset
Reset
Soft
Soft
Soft
04
18
4
4
0
0
0
187