gmacgrp_lpi_timers_control

          Register 13 (LPI Timers Control Register)   

The LPI Timers Control register controls the timeout values in the LPI states. It specifies the time for which the MAC transmits the LPI pattern and also the time for which the MAC waits before resuming the normal transmission. This register is present only when you select the Energy Efficient Ethernet feature during core configuration.
      
Module Instance Base Address Register Address
i_emac_emac0 0xFF800000 0xFF800034
i_emac_emac1 0xFF802000 0xFF802034
i_emac_emac2 0xFF804000 0xFF804034

Size: 32

Offset: 0x34

Access: RW

Important: The value of a reserved bit must be maintained in software. When you modify registers containing reserved bit fields, you must use a read-modify-write operation to preserve state and prevent indeterminate system behavior.
Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

reserved_31_26

RO 0x0

lst

RW 0x3E8

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

twt

RW 0x0

gmacgrp_lpi_timers_control Fields

Bit Name Description Access Reset
31:26 reserved_31_26
Reserved
RO 0x0
25:16 lst
LPI LS Timer

This field specifies the minimum time (in milliseconds) for which the link status from the PHY should be up (OKAY) before the LPI pattern can be transmitted to the PHY. The MAC does not transmit the LPI pattern even when the LPIEN bit is set unless the LPI LS Timer reaches the programmed terminal count. The default value of the LPI LS Timer is 1000 (1 sec) as defined in the IEEE standard.
RW 0x3E8
15:0 twt
LPI TW Timer

This field specifies the minimum time (in microseconds) for which the MAC waits after it stops transmitting the LPI pattern to the PHY and before it resumes the normal transmission. The TLPIEX status bit is set after the expiry of this timer.
RW 0x0