ST802RT1A 데이터 시트보기 (PDF) - STMicroelectronics
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ST802RT1A Datasheet PDF : 58 Pages
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Registers and descriptors description
ST802RT1A, ST802RT1B
suppressed from transmission. Resetting the chip restores the default bit values. Reading
the register returns the values last written to the corresponding bits, or else the default
values if no write has been completed since the last chip reset. Even though bit 9 (advertise
100BASE-T4) is writable, it should never be set since the ST802RT1x does not support T4
operation.
Advertised selector: Bits 4:0 of the advertisement register contain the fixed value “00001”,
indicating that the chip belongs to the 802.3 class of PHY transceivers
Table 15. RN05 [0d05, 0x05]: Auto-negotiation link partner ability register
Bit Bit name
Description
Default
1 -> Link partner desires next page transfer
15 LP Next Page
0 -> Link partner does not desire next page transfer
14
LP
Acknowledge
1 -> Link partner acknowledges reception of the ability data
word
0 -> Acknowledge not yet received
13
LP Remote 1 -> Remote fault indicated by link partner
Fault
0 -> No remote fault indicated by link partner
12 RESERVED --
Asymmetric 1 -> LP supports asymmetric pause (MAC level: clause 31,
11 Pause (full- annex 31B of 802.3u)
duplex) 0 -> LP has no MAC-based full-duplex flow control.
10
LP pause (full-
duplex)
1 -> LP supports symmetric pause (MAC level: clause 31,
annex 31B of 802.3u)
0 -> LP has no MAC-based full-duplex flow control.
9
100BASE-T4
1 -> LP supports 100BASE-T4
0 -> LP does not support 100BASE-T4
8
100BASE-TX 1 -> LP supports 100BASE-TX full-duplex
full duplex 0 -> LP does not support 100BASE-TX full-duplex
7
100BASE-TX
1 -> LP supports 100BASE-TX
0 -> LP does not support 100BASE-TX
6
10BASE-T full 1 -> LP supports 10BASE-T full-duplex
duplex 0 -> LP does not support 10BASE-T full-duplex
5
10BASE-T
1 -> LP supports 10BASE-T
0 -> LP does not support 10BASE-T
4:0
LP selector
field
LP's binary encoded protocol selector
0
0
0
0
0
0
0
0
0
0
0
00000b
RW
type
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Type
-
-
-
-
-
-
-
-
-
-
-
-
24/58
LP next page: Bit 15 of the link partner ability register returns a value of “1” when the link
partner implements the next page function and has next page information that it wants to
transmit.
LP ack: Bit 14 of the link partner ability register is used by auto-negotiation to indicate that a
device has successfully received its link partner's link code word.
LP remote fault: Bit 13 of the link partner ability register returns a value of “1” when the link
partner signals that a remote fault has occurred. The ST802RT1x simply copies the value to
this register and does not act upon it.
Doc ID 17049 Rev 1
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