Datasheet

SW_STRAP
Pin tied to Ground
Power up
or
Reset event Thrugh
HW_RESET pin
Software Polls OUI Register
value (0x0002) to detect end
of PHY reset
Data = FFFF
Software configures
SW_STRAP registers:
SWSCR1-3
(0x0009,0x000A,0x000B)
Data = 2000
Software sets
Config_Done - bit [15] at
SWSCR1 Register (0x0009)
PHY starts power up
sequence using SW Strapping
configuration values
PHY in Operating mode
and tries to establish link
200 sm
PHY in Power Down
State
TLK110
SLLS901D –DECEMBER 2011–REVISED JANUARY 2014 www.ti.com
3.8 Software Strapping Mode
The TLK110 provides a mechanism to extend the number of configuration pins to allow wider system
programmability of PHY functions.
Connecting an external pull-down to pin 21 causes the device to enter SW Strapping Mode after power-up
or a hardware reset event. In this mode the device wakes up after power-up/hardware reset in power
down mode. While in power down (in SW strap mode only) the PHY allows the system processor to
access the dedicated Strapping Registers and configure modes of operation. Once the dedicated
Strapping Registers are programmed, setting the SW Strapping Mode Release register bit (“Configuration
done”), bit 15 of register SWSCR1(0x0009), must be done in order to take the device out of power-down
mode. An internal reset pulse is generated and the SW Strap Register values are latched into internal
registers. Unless a new Power-up/HW reset was applied, the configured SW Strap Register values will
function as default values. Generation of Software Reset/Software Restart - bits 15 and 14 of register
PHYRCR (0x001F) will not clear the configured SW Strap bit values.
There are 3 Software Strapping control registers: SWSCR1 (0x0009), SWSCR2 (0x000A) and
SWSCR3(0x000B) contain the configuration bits used as strapping options or virtual strapping pins during
HW Reset or Power-Up.
The TLK110 Software Strap mechanism behavior is shown in Figure 3-4.
Figure 3-4. TLK110 SW Strap Programming
14 Hardware Configuration Copyright © 2011–2014, Texas Instruments Incorporated
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