TLK105 Datasheet, PDF (52/99 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer Transceiver

TLK105
TLK106
SLLSEB8A – AUGUST 2012 – REVISED MARCH 2013
www.ti.com
8.1.10 Control register 1 (CR1)
BIT
15:10
9
BIT NAME
RESERVED
RMII
Enhanced
Mode
8 TDR
AUTORUN
7 Link Loss
Recovery
6 Fast Auto
MDI-X
5 Robust Auto
MDI-X
4 Fast AN En
Table 8-13. Control register 1 (CR1), address 0x0009
DEFAULT
1, RW
0, RW
0, RW
0, RW
0, RW
0, RW
0, RW
DESCRIPTION
RESERVED
RMII Enhanced Mode:
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 status 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 versus Force 100Base-TX or Force 100Base-TX versus
Force 100Base-TX), this Robust Auto MDI/MDIX mode allows MDI/MDIX resolution and
prevents deadlock.
Fast AN En:
1 = Enable Fast Auto-Negotiation mode – The PHY auto-negotiates using Timer
setting according to Fast AN Sel bits (bits 3:2 this register)
0 = Disable 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.
52
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