LAN9500AI datasheet(97/213 Pages) MICROCHIP

97 / 213 page

 2010 - 2015 Microchip Technology Inc.

DS00001875A-page 97

LAN950x

• MAC Address High Register (ADDRH) and MAC Address Low Register (ADDRL)

• Hardware Configuration Register (HW_CFG)

• LED General Purpose IO Configuration Register (LED_GPIO_CFG)

• General Purpose IO Wake Enable and Polarity Register (GPIO_WAKE)

5.9

Device Clocking

The device requires a fixed-frequency 25MHz clock source. This is typically provided by attaching a 25MHz crystal to

the XI and XO pins. The clock can optionally be provided by driving the XI input pin with a single-ended 25MHz clock

source. If a single-ended source is selected, the clock input must run continuously for normal device operation.

Internally, the device generates its required clocks with a phase-locked loop (PLL). It reduces its power consumption in

several of its operating states by disabling its internal PLL and derivative clocks. The 25MHz clock remains operational

in all states where power is applied.

5.10

Device Power Sources

The device may be soft powered by the USB bus or self powered via external power supplies. The following external

3.3V power supplies are required when power is not being furnished by the USB bus:

• VDD33IO, VDD33A

5.11

Power States

The following power states are featured.

• UNPOWERED

• NORMAL (Unconfigured and Configured)

• Suspend (SUSPEND0, SUSPEND1, SUSPEND2, and SUSPEND3)

All

four

SUSPEND

states

are

supported

LAN9500A/LAN9500Ai.

SUSPEND3

not

supported

LAN9500/LAN9500i.

Figure 5-29 illustrates the power states and allowed state transitions.

Note:

The device also uses power supplied by an internal regulator and connection does not vary. Since the reg-

ulated supply is derived from VDD33IO, there is no need to discuss it separately.

FIGURE 5-29:

POWER STATES

UN PO W E R E D

NORM A L

(C onfig ured )

SU S PEND 0

SUSPEND 1

SUSPEND 2

US B Re su m e ||

WO L ||

GP IO

U S B S u spend

US B Re su m e ||

GP IO

U S B S u spend

US B Re su m e ||

E nergy D e te ct ||

GP IO

US B S u s p en d

!VBU S _ D E T

(A ny state )

(P O R || n R ES ET ||

US B Re s e t || S R S T )

&& VBU S _ D E T

NORM A L

(U n c onfig ured )

C onfig ured

D e c onfigured

US B Re su m e ||

GP IO

U S B S u spend

SUSPEND 3

U S B Sus p e nd

US B Re s u m e ||

F ram e R e ce ived ||

GP IO

VB U S _ D ET

As se rte d

LAN9500AI 데이터시트(PDF) 97 Page - Microchip Technology

LAN9500AI 데이터시트(HTML) 97 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL