LAN9250 datasheet(46/421 Pages) MICROCHIP

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LAN9250

DS00001913A-page 46

 2015 Microchip Technology Inc.

6.3.3

BLOCK LEVEL POWER MANAGEMENT

The device supports software controlled clock disabling of various modules in order to reduce power consumption.

6.3.3.1

Disabling The Host MAC

The entire Host MAC may be disabled by setting the HMAC_DIS bit in the Power Management Control Register

(PMT_CTRL). As a safety precaution, in order for this bit to be set, it must be written as a 1 two consecutive times. A

write of a 0 will reset the count.

FIGURE 6-1:

PME PIN AND PME INTERRUPT SIGNAL GENERATION

Note:

Disabling individual blocks does not automatically reset the block, it only places it into a static non-opera-

tional state in order to reduce the power consumption of the device. If a block reset is not performed before

re-enabling the block, then care must be taken to ensure that the block is in a state where it can be disabled

and then re-enabled.

PME

ED_EN (bit 14) of

PMT_CTRL register

WOL_EN (bit 9) of

PMT_CTRL register

50ms

PME_EN (bit 1) of

PMT_CTRL register

PME_IND (bit 3) of

PMT_CTRL register

PME_POL (bit 2) of

PMT_CTRL register

PME_TYPE (bit 6) of

PMT_CTRL register

LOGIC

WUEN (bit 2) of

HMAC_WUCSR register

MPEN (bit 1) of

HMAC_WUCSR register

WOL_STS (bit 5) of

PMT_CTRL register

WUFR (bit 6) of

HMAC_WUCSR register

MPR (bit 5) of

HMAC_WUCSR register

Denotes a level-triggered "sticky" status bit

PME_INT_EN (bit 17)

of INT_EN register

PME_INT (bit 17)

of INT_STS register

IRQ_EN (bit 8)

of IRQ_CFG register

IRQ

Other System

Interrupts

ED_STS (bit 16) of

PMT_CTRL register

INT7_MASK (bit 7) of

PHY_INTERRUPT_MASK register

INT7 (bit 7) of

PHY_INTERRUPT_SOURCE register

Polarity &

Buffer Type

Logic

BCST_EN (bit 0) of

HMAC_WUCSR register

BCAST_FR (bit 4) of

HMAC_WUCSR register

PFDA_EN (bit 3) of

HMAC_WUCSR register

PFDA_FR (bit 7) of

HMAC_WUCSR register

Other PHY Interrupts

PM_WAKE (bit 28) of

PMT_CTRL register

PME wake-up

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