TLK110 Datasheet, PDF (58/104 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer

TLK110
SLLS901A – DECEMBER 2011 – REVISED FEBRUARY 2012
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Table 8-13. SW Strap Control register 1 (SWSCR1), address 0x0009 (continued)
BIT BIT NAME
9 RMII
Enhanced
Mode
8 TDR
AUTORUN
7 Link Loss
Recovery
6 Fast Auto
MDI-X
5 Robust Auto
MDI-X
4 Fast AN En
DEFAULT
0, SWS, RW
RMII Enhanced Mode:
DESCRIPTION
0, SWS, RW
0, SWS, RW
0, SWS, RW
0, SWS, RW
0, SWS, RW
1 = Enable RMII Enhanced Mode.
0 = RMII operates in normal mode.
In normal mode, If the line is not idle CRS_DV goes high. As soon as the False Carrier is
detected, RX_ER is asserted and RXD is set to “2”. This situation remains for the duration
of the receive event. While in enhanced mode, CRS_DV is disqualified and de-asserted
when the False Carrier detected. This also remains for the duration of the receive event.
In addition in normal mode, the start of the packet is intact. Each symbol error is indicated
by setting RX_ER high. The data on RXD is replaced with “1” starting with the first symbol
error. While in enhanced mode, the CRS_DV is de-asserted with the first symbol error.
TDR Auto Run at link down:
1 = Enable execution of TDR procedure after link down event.
0 = Disable automatic execution of TDR.
Link Loss Recovery:
1 = Enable Link Loss Recovery mechanism. This mode allow recovery from short
interference and continue to hold the link up for period of additional few mSec till
the short interference will gone and the signal is OK.
0 = Normal Link Loss operation. Link status will go down approximately 250uSec from
signal loss.
Fast Auto MDI/MDIX:
1 = Enable Fast Auto MDI/MDIX mode.
0 = Normal Auto MDI/MDIX mode.
If both link partners are configured to work in Force 100Base-TX mode (Auto-Negotiation
is disabled), this mode enables Automatic MDI/MDIX resolution in a short time.
Robust Auto MDI-X :
1 = Enable Robust Auto MDI/MDIX resolution.
0 = Normal Auto MDI/MDIX mode.
If link partners are configured to operational modes that are not supported by normal Auto
MDI/MDIX mode (like Auto-Neg vs. Force 100Base-TX or Force 100Base-TX vs. Force
100Base-TX), this Robust Auto MDI/MDIX mode allows MDI/MDIX resolution and
prevents deadlock.
Fast AN En:
1 = Enabe Fast Auto-Negotiation mode – The PHY auto-negotiates using Timer setting
according to Fast AN Sel bits (bits 3:2 this register)
0 = Disabe Fast Auto-Negotiation mode – The PHY auto-negotiates using normal
Timer setting
Adjusting these bits reduces the time it takes to Auto-negotiate between two PHYs. Note:
When using this option care must be taken to maintain proper operation of the system.
While shortening these timer intervals may not cause problems in normal operation, there
are certain situations where this may lead to problems.
58
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