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AM79C978VC/W 数据表(PDF) 184 Page - Advanced Micro Devices |
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AM79C978VC/W 数据表(HTML) 184 Page - Advanced Micro Devices |
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184 / 261 page  184 Am79C978 HPR20 and HPR21: HomePNA PHY RxCOMM (Registers 20 and 21) Table 53. HPR20 and HPR21: HomePNA PHY RxCOMM (Registers 20 and 21) The 32-bit received data field to be used for out-of- band communication between PHY management enti- ties. 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 over-write the register contents. A non-null re- ceived PCOM will set the RxPCOM Valid bit of the Event Status Register (Register HPR26). Accessing the high word of the register clears this bit and allows over-writing of the register by subsequent received packets. HPR22: HomePNA PHY AID (Register 22) Table 54. HPR22: HomePNA PHY AID (Register 22) The PHY’s AID address is used for collision detection. 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 in- dicate a remote command. HPR23: HomePNA PHY Noise Control (Register 23) Table 55. HPR23: HomePNA PHY Noise Control (Register 23) Hex Mnemonic Description Read/ Write Default Hex Soft Reset 14-15 PHY_RX_COMM (4) The 32-bit preamble received on the HomePNA PHY. Register 14 contains the high word and Register 15 the low word. R All 0s All 0s Bits Mnemonic Description Read/ Write Default Hex Soft Reset PHY_AID 15:8 PHY_AID The Address ID of this PHY If PHY_Control Disable AID Negotiation is not set then writes to this bit will have no effect. R/W 00 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 the control register. R/W 00 00 Bits Mnemonic Description Read/ Write Default Hex Soft Reset PHY_NOISE_CTRL1 15:8 Noise Floor The minimum value of the NOISE measurement. R/W 03 03 7:0 Noise Ceiling The maximum value if the NOISE measurement. If it is exceeded, NOISE is reset to the FLOOR. R/W FF FF |
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