Table 5.27 register 6 - auto negotiation expansion, Table 5.28 register 16 - silicon revision, Table 5.29 register 17 - mode control/status – SMSC FlexPWR LAN8720 User Manual
Page 44: Datasheet
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Revision 1.0 (05-28-09)
44
SMSC LAN8720/LAN8720i
DATASHEET
Table 5.27 Register 6 - Auto Negotiation Expansion
ADDRESS
NAME
DESCRIPTION
MODE
DEFAULT
6.15:5
Reserved
RO
0
6.4
Parallel Detection
Fault
1 = fault detected by parallel detection logic
0 = no fault detected by parallel detection logic
RO/
LH
0
6.3
Link Partner Next
Page Able
1 = link partner has next page ability
0 = link partner does not have next page ability
RO
0
6.2
Next Page Able
1 = local device has next page ability
0 = local device does not have next page ability
RO
0
6.1
Page Received
1 = new page received
0 = new page not yet received
RO/
LH
0
6.0
Link Partner Auto-
Negotiation Able
1 = link partner has auto-negotiation ability
0 = link partner does not have auto-negotiation ability
RO
0
Table 5.28 Register 16 - Silicon Revision
ADDRESS
NAME
DESCRIPTION
MODE
DEFAULT
16.15:10
Reserved
RO
0
16.9:6
Silicon Revision
Four-bit silicon revision identifier.
RO
0001
16.5:0
Reserved
RO
0
Table 5.29 Register 17 - Mode Control/Status
ADDRESS
NAME
DESCRIPTION
MODE
DEFAULT
17.15:14
Reserved
Write as 0; ignore on read.
RW
0
17.13
EDPWRDOWN
Enable the Energy Detect Power-Down mode:
0 = Energy Detect Power-Down is disabled
1 = Energy Detect Power-Down is enabled
RW
0
17.12
Reserved
Write as 0, ignore on read
RW
0
17.11
LOWSQEN
The Low_Squelch signal is equal to LOWSQEN AND
EDPWRDOWN.
Low_Squelch = 1 implies a lower threshold
(more sensitive).
Low_Squelch = 0 implies a higher threshold
(less sensitive).
RW
0
17.10
MDPREBP
Management Data Preamble Bypass:
0 – detect SMI packets with Preamble
1 – detect SMI packets without preamble
RW
0
17.9
FARLOOPBACK
Force the module to the FAR Loop Back mode, i.e. all
the received packets are sent back simultaneously (in
100Base-TX only). This bit is only active in RMII
mode, as described in
. This mode
works even if MII Isolate (0.10) is set.
RW
0
17.8:7
Reserved
Write as 0, ignore on read.
RW
00