LAN9117 datasheet(85/131 Pages) SMSC

85 / 131 page

High Performance Single-Chip 10/100 Non-PCI Ethernet Controller

Datasheet

SMSC LAN9117

Revision 1.1 (05-17-05)

DATASHEET

5.3.12

TX_FIFO_INF—Transmit FIFO Information Register

This register contains the free space in the transmit data FIFO and the used space in the transmit

status FIFO in the LAN9117.

5.3.13

PMT_CTRL— Power Management Control Register

This register controls the Power Management features. This register can be read while the

LAN9117

is in a power saving mode.

Note: The LAN9117 must always be read at least once after power-up, reset, or upon return from a

power-saving state or write operations will not function.

Offset:

80h

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31-24

Reserved

23-16

TX Status FIFO Used Space (TXSUSED). Indicates the amount of space

in DWORDS used in the TX Status FIFO.

00h

15-0

TX Data FIFO Free Space (TDFREE). Reads the amount of space in bytes,

available in the TX data FIFO. The application should never write more data

than is available, as indicated by this value.

1200h

Offset:

84h

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31:14

RESERVED

13-12

Power Management Mode (PM_MODE)

– These bits set the LAN9117 into

the appropriate Power Management mode. Special care must be taken when

modifying these bits.

Encoding:

00b – D0 (normal operation)

01b – D1 (wake-up frame and magic packet detection are enabled)

10b – D2 (can perform energy detect)

11b – RESERVED - Do not set in this mode

Note:

When the LAN9117 is in a any of the reduced power modes, a write

of any data to the BYTE_TEST register will wake-up the device. DO

NOT PERFORM WRITES TO OTHER ADDRRESSES while the

READY bit in this register is cleared.

00b

RESERVED

PHY Reset (PHY_RST) – Writing a ‘1’ to this bit resets the PHY. The internal

logic automatically holds the PHY reset for a minimum of 100us. When the

PHY is released from reset, this bit is automatically cleared. All writes to this

bit are ignored while this bit is high.

LAN9117 Datasheet(PDF) 85 Page - SMSC Corporation

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