KSZ9567R datasheet(199/233 Pages) MICROCHIP

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DS00002329E-page 199

KSZ9567R

Write 0xC0 to the Switch MIB Control Register to clear the MIB counters for all enabled ports (while continuing

to also freeze the counters).

At the beginning of the 1 second period, write 0x00 to the Switch MIB Control Register to enable the counters.

At the end of the 1 second period, write 0x40 to the Switch MIB Control Register to freeze the counters.

Read each counter for each port.

5.4

MDIO Manageable Device (MMD) Registers (Indirect)

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. However, the KSZ9567R uses only a

small fraction of the available registers. Refer to Table 5-7, "MMD Register Map" for a list of accessible MMD device

addresses and their associated register addresses. Detailed descriptions of the supported MMD registers are provided

in the following subsections.

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

• PHY MMD Setup Register

• PHY MMD Data Register

Example: MMD Register Write

Write MMD - Device Address 2h, Register 00h = 0010h to enable single-LED mode.

Write the PHY MMD Setup Register with 0002h // Set up register address for MMD – Device Address 2h.

Write the PHY MMD Data Register with 0000h // Select Register 00h of MMD – Device Address 2h.

Write the PHY MMD Setup Register with 4002h // Select register data for MMD – Device Address 2h, Reg. 00h.

Write the PHY MMD Data Register with 0010h // Write value 0010h to MMD – Device Address 2h, Reg. 00h.

Example: MMD Register Read

Read MMD - Device Address 7h, Register 3Ch for the LED mode status. Optional auto-increment is used.

Write the PHY MMD Setup Register with 0007h // Set up register address for MMD – Device Address 7h.

Write the PHY MMD Data Register with 003Ch // Select Register 3Ch of MMD – Device Address 7h.

Write the PHY MMD Setup Register with 8007h // Select register data for MMD – Device Address 7h, Reg. 3Ch.

Read the PHY MMD Data Register

// Read data in MMD – Device Address 7h, Reg. 3Ch.

5.4.1

MMD LED MODE REGISTER

TABLE 5-7:

MMD REGISTER MAP

Device Address

(hex)

Description

00h

MMD LED Mode Register

3Ch

MMD EEE Advertisement Register

MMD Address:

0x02

0x00

Size:

16 bits

Bits

Description

Type

Default

15:5

RESERVED

0x000

LED Mode

1 = Single-LED Mode

0 = Tri-color Dual-LED Mode

R/W

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