KSZ8091RNA datasheet(39/62 Pages) MICROCHIP

39 / 62 page

 2016 Microchip Technology Inc.

DS00002298A-page 39

KSZ8091RNA/RND

Note 4-1

RW = Read/Write; RO = Read Only; SC = Self-Cleared.

4.3

MMD Registers

MMD registers provide indirect read/write access to up to 32 MMD Device Addresses with each device supporting up

to 65,536 16-bit registers, as defined in Clause 22 of the IEEE 802.3 Specification. The KSZ8091RNA/RND, however,

uses only a small fraction of the available registers. See the MMD Register Descriptions section for a list of supported

MMD device addresses and their associated register addresses.

The following two standard registers serve as the portal registers to access the indirect MMD registers.

• Standard register Dh – MMD Access – Control

• Standard register Eh – MMD Access – Register/Data

1F.10

Power

Saving

1 = Enable power saving

0 = Disable power saving

1F.9

Interrupt

Level

1 = Interrupt pin active high

0 = Interrupt pin active low

1F.8

Enable

Jabber

1 = Enable jabber counter

0 = Disable jabber counter

1F.7

RMII Refer-

ence Clock

Select

1 = For KSZ8091RNA, clock input to XI (Pin 8) is

50 MHz for RMII – 50 MHz Clock Mode.

For KSZ8091RND, clock input to XI (Pin 8) is

25 MHz for RMII – 25 MHz Clock Mode.

0 = For KSZ8091RNA, clock input to XI (Pin 8) is

25 MHz for RMII – 25 MHz Clock Mode.

For KSZ8091RND, clock input to XI (Pin 8) is

50 MHz for RMII – 50 MHz Clock Mode.

1F.6

Reserved

1F.5:4

LED Mode

[00] = LED0: Link/Activity

[01] = LED0: Link

[10], [11] = Reserved

1F.3

Disable

Transmitter

1 = Disable transmitter

0 = Enable transmitter

1F.2

Remote

Loopback

1 = Remote (analog) loopback is enabled

0 = Normal mode

1F.1

Reserved

1F.0

Disable Data

Scrambling

1 = Disable scrambler

0 = Enable scrambler

TABLE 4-5:

PORTAL REGISTERS (ACCESS TO INDIRECT MMD REGISTERS)

Address

Name

Description

Mode

Default

D.15:14

MMD –

Operation

Mode

For the selected MMD device address (bits [4:0] of

this register), these two bits select one of the fol-

lowing register or data operations and the usage

for MMD Access – Register/Data (Reg. Eh).

00 = Register

01 = Data, no post increment

10 = Data, post increment on reads and writes

11 = Data, post increment on writes only

D.13:5

Reserved

00_0000_000

TABLE 4-4:

VENDOR SPECIFIC REGISTER DESCRIPTIONS (CONTINUED)

Address

Name

Description

Mode

Note 4-1

Default

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