10Base-T PHY Registers
A-42
A.4.2 PHY Generic Status Register – GEN_sts @ 0x1
1
JABBER
LINK
1
RFLT
AUTOCOMPLT
1
1
0
0
0
Byte 0
Byte 1
Reserved
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Table A–20. PHY Generic Status Register Bits
Bit
Name
Function
15
0
100Base-T4 capable: Not supported
14
0
100Base-Tx full-duplex capable: Not supported
13
0
100Base-Tx half-duplex capable: Not supported
12
1
10Base-T full-duplex capable: This bit is hardwired to 1 to indicate that 10Base-T full
duplex is supported.
11
1
10Base-T half-duplex capable: This bit is hardwired to 1 to indicate 10Base-T half du-
plex is supported.
10 – 6
Reserved
Read as 0
5
AUTOCMPLT
Autoconfiguration complete: When this bit is set, it indicates that the autonegotiation
process has finished or was not enabled. If autonegotiation is enabled, this bit also indi-
cates that the contents of registers AN_adv, AN_lpa and AN_exp are valid. This bit is
0 only during an actual negotiation process.
4
RFLT
Remote fault: This bit mirrors the LPRFLT bit received in the most recent autonegotiation
link code word. When set to 1, this bit indicates that the link partner is in a fault condition.
3
1
Autonegotiation ability: The PHY supports autonegotiation.
2
LINK
Link status: When this bit is read as 1, it indicates that the PHY has determined that a
valid 10Base-T link has been established. When read as 0, it indicates that the link is
not valid. A link invalid state is latched (held) until the register is read. This bit has no
meaning if the AUI interface is selected.
The PHY implements the standard 10Base-T link integrity test state machine. Link
pulses are expected to be seen every 8 – 24 ms to maintain a good link. If no link pulses
are seen for over 100 ms, the link-fail state is entered and this bit is cleared. If AUTOENB
is not set, the bit is set again after seven consecutive, correctly timed link pulses are re-
ceived. If AUTOENB is set, the link fail causes the autonegotiation process to restart.
Summary of Contents for ThunderLAN TNETE100A
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