Datasheet

TLK110
www.ti.com SLLS901D –DECEMBER 2011–REVISED JANUARY 2014
8.1.12 Software Strap Control Register 3 (SWSCR3)
This register contains the configuration bits used as strapping options or virtual strapping pins during HW
RESET. These configuration values are programmed by the system processor after HW_RESET/POR,
and then the “Config Done” - bit 15 of register SWSCR1 (0x0009) is set at the end of the configuration. An
internal reset pulse is generated and the SW Strap bit values are latched into internal registers.
Table 8-15. SW Strap Control register 3 (SWSCR3), address 0x000B
BIT BIT NAME DEFAULT DESCRIPTION
15:7 RESERVED 0, RO RESERVED: Writes ignored, read as 0.
6 Polarity 0, SWS, RW Polarity Swap:
Swap
1 = Inverted polarity on both pairs: TPTD+ ↔ TPTD-, TPRD+ ↔ TPRD-
0 = Normal polarity
Port Mirror function: To Enable port mirroring, set bit 5 and this bit high.
5 MDI/MDIX 0, SWS, RW MDI/MDIX Swap:
Swap
1 = Swap MDI pairs (Receive on TPTD pair, Transmit on TPRD pair)
0 = MDI pairs normal (Receive on TPRD pair, Transmit on TPTD pair)
Port Mirror function: To Enable port mirroring, set this bit and bit 6 high.
4 Bypass 0, SWS, RW Bypass 4B/5B Encoder/Decoder Functionality:
4B/5B
1 = Bypass the 4B/5B Encoder in TX path and the Decoder in RX path to allow direct 5-bit TX
and 5-bit RX interface to/from the MAC. In the TX path, the additional TXD [4] input pin is
the TDI (pin 12) and in the RX path, the additional RXD [4] output pin is the RXERR (pin
41). Note: The PHY must be configured to operate in MII mode.
0 = Normal operation
3:0 Fast Link 0, SWS, RW Fast Link Down Modes:
Down Mode
Bit 3 Drop the link based on RX Error count of the MII interface – When a predefined number
of 32 RX Error occurrences in a 10µs interval is reached, the link will be dropped.
Bit 2 Drop the link based on MLT3 Errors count (Violation of the MLT3 coding in the DSP
output) – When a predefined number of 20 MLT3 Error occurrences in a 10µs interval is
reached, the link will be dropped.
Bit 1 Drop the link based on Low SNR Threshold – When a predefined number of 20
Threshold crossing occurrences in a 10µs interval is reached, the link will be dropped.
Bit 0 Drop the link based on Signal/Energy loss indication – When the Energy detector
indicates Energy Loss, the link will be dropped. Typical reaction time is 10µs.
The Fast Link Down function is an OR of all these 4 options, so the designer can enable
combinations of these conditions.
8.1.13 Extended Register Addressing
REGCR (0x000D) and ADDAR (0x000E) allow read/write access to the extended register set (addresses
above 0x001F) using indirect addressing.
• REGCR [15:14] = 00: A write to ADDAR modifies the extended register set address register. This
address register must be initialized in order to access any of the registers within the extended register
set.
• REGCR [15:14] = 01: A read/write to ADDAR operates on the register within the extended register set
selected (pointed to) by the value in the address register. The address register contents (pointer)
remain unchanged.
• REGCR [15:14] = 10: A read/write to ADDAR operates on the register within the extended register set
selected (pointed to) by the value in the address register. After that access is complete, for both reads
and writes, the value in the address register is incremented.
• REGCR [15:14] = 11: A read/write to ADDAR operates on the register within the extended register set
selected (pointed to) by the value in the address register. After that access is complete, for write
accesses only, the value in the address register is incremented. For read accesses, the value of the
address register remains unchanged.
Copyright © 2011–2014, Texas Instruments Incorporated Register Block 59
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