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| 型號： | HOME |
| 英文描述： | Home PHY Single-Chip 1/10Mbps Home Networking PHY? - (PDF) |
| 中文描述： | 首頁PHY的單芯片1/10Mbps家庭網(wǎng)絡物理層？ - （PDF格式） |
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52
Am79C901A
P R E L I M I N A R Y
HPR20 and HPR21: HomePNA PHY RxCOMM Registers (Registers 20 and 21)
Table 29.
HPR20 and HPR21: HomePNA PHY RxCOMM Registers (Registers 20 and 21)
The 32-bit received data field to be used for out-of-
band communication between PHY management
entities. No protocol for out-of-band management
has been defined. Accessing the low word of the
register is sufficient to ensure that subsequently
received packets will not overwrite the register
contents. A non-null received PCOM will set the
RxPCOM Valid bit of the Event Status Register
(HPR26). Accessing the high word of the register
clears this bit and allows overwriting of the register
by subsequent received packets.
HPR22: HomePNA PHY AID Register (Register 22)
Table 30.
HPR22: HomePNA PHY AID Register (Register 22)
The PHY
’
s AID address is used for collision detec-
tion. Unless bit 7 of the CONTROL register is set,
the PHY is assured to select a unique AID address.
Addresses above EFh are reserved. Address FFh is
defined to indicate a remote command.
HPR23: HomePNA PHY Noise Control Register (Register 23)
Table 31.
HPR23: HomePNA PHY Noise Control Register (Register 23)
Bits
Name
Description
Read/Write
Default
Value
(hex)
15:0
PHY_RX_COMM (4)
The 32-bit preamble received by the HomePNA
PHY. HPR20 contains the high word and HPR21 the
low word.
R
0000
Bits
Name
Description
Read/Write
Default
Value
(hex)
15:8
PHY_AID
The Access ID of this PHY.
If PHY_Control Disable AID Negotiation is set, then
writes to this bit will have no effect.
R/W
00
7:0
Noise Events
An 8-bit counter that records the number of noise
events detected. Overflows are held as FFh. Can be
cleared by setting bit 6 of HPR16.
R/W
00
Bits
Name
Description
Read/
Write
Default
Value
(hex)
15:8
Noise Floor
If the input NOISE measurement (HPR25, bits 15:8)
exceeds the PEAK measurement (HPR25, bits 7:0),
this value is loaded into the NOISE Level register
HPR25, bits 15:8.
R/W
03
7:0
Noise Ceiling
If the input NOISE measurement (HPR25, bits 15:8)
exceeds the PEAK measurement (HPR25, bits 7:0),
this value is loaded into the NOISE Level register
HPR25, bits 7:0.
R/W
FF
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