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`

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