AM79C978 Advanced Micro Devices, AM79C978 Datasheet - Page 183

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

HPR17: HomePNA Status Control (Register 17)
HPR18 and HPR19: HomePNA PHY TxCOMM
(Registers 18 and 19)
The 32-bit transmitted data field is 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 causes the PHY
to send all-0 PCOMs until the high word has been ac-
cessed. Once accessed, the next transmitted packet
will cause this register’s contents to be shifted out in
15:13
Bits
11:7
12-13
3:0
Hex
12
6
5
4
Reserved
Any1home
Reserved
Received_Power
Received_Speed
Received_Ver
Reserved
PHY_TX_COMM (4)
Table 52. HPR18 and HPR19: HomePNA PHY TxCOMM (Registers 18 and 19)
Mnemonic
Mnemonic
Table 51. HPR17: HomePNA Status Control (Register 17)
Reads will produce undefined results;
Writes = 0
1 = Any1Home Link Packet Disable
0 = Any1Home Link Packet Enable
Reads will produce undefined results;
Writes = 0
1 = Last packet received was sent at high power
0 = Last packet received was sent at low power
1 = Last packet received was sent at high power
0 = Last packet received was sent at low power
1 = Last packet received was sent at Version
XX
Reads will produce undefined results;
Writes = 0
The 32-bit preamble transmitted on the
HomePNA PHY. Register 12 contains the high
word and Register 13 the low word.
Am79C978
Description
Description
the PCOM field of the transmitted packet. Upon trans-
mission, this register will read back as all 0s. A non-null
transmitted PCOM will set the TxPCOM Ready bit in
the Event Status Register (Register HPR26). An ac-
cess to any of the two TxPCOM words will clear the Tx-
PCOM Ready bit in the ISTAT register.
Read/
Write
Read/
R/W
R/W
R/W
R/W
Write
R/W
R
R
R
Default
Default
All 0s
Hex
Hex
0
0
0
0
Reset
Reset
All 0s
Soft
Soft
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