KSZ9567RTXI datasheet(61/232 Pages) MICROCHIP

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DS00002329D-page 61

KSZ9567R

4.11.3.2

MDIO Manageable Device (MMD) Registers (Indirect)

The MIIM interface provides indirect access to a set of MMD registers as defined in Section 5.4, "MDIO Manageable

Device (MMD) Registers (Indirect)," on page 200.

4.12

In-Band Management

The in-band management access (IBA) is a feature that provides full register read and write access via any one of the

seven data ports. Port 7 is the default IBA port. The in-band feature is enabled or disabled by a strapping option at

power-up and reset. To use a different port instead of port 7 for IBA, the SPI or I2C interface or IBA must be used to

write to a control register. IBA may not be used on more than one port at a time, but the IBA port can still be used for

sending and receiving non-IBA traffic.

In-band management frames are processed differently from normal network frames. They are recognized as special

frames, so address and VID lookup, VLAN tagging, source address filtering, un-tag discard, tagged frame drop, etc. are

not applied to them. Received in-band management frames are never forwarded to the switch fabric or to any other port.

The In-Band Management (IBA) Control Register is used to enable and control the IBA feature and to specify one of the

seven ports as the IBA port.

The IBA frame format is shown in Figure 4-17. The layer 2 portion of the IBA frame contains normal destination address

(DA) and source address (SA) fields. The DA of the frames are defined to be the switch MAC address (default 00-10-

A1-FF-FF-FF), and the SA is the MAC address of the source device. The DA and SA will be swapped in the response

frame. A special 4-byte IBA tag follows the SA. This is then followed by the 2-byte EtherType/Length field that serves to

identify this as an IBA frame.

Only one IBA frame can be processed at a time. Any subsequent IBA frames received by the device will be dropped

unless the most recent response frame has been fully transmitted.

There are six types of read/write commands: READ, WRITE, WAIT on 0, WAIT on 1, MODIFY to 0 and MODIFY to 1.

The minimum IBA read or write size is 32-bits. There is no IBA option for 8-bit or 16-bit transfers.

The burst commands offer fast and bundled data return, up to the capacity of the IBA frame buffer. There are two types

of operations in burst command: READ burst and Write burst.

Vendor-Specific Registers

10h

RESERVED

11h

0xN122 - 0xN123

PHY Remote Loopback Register

12h

0xN124 - 0xN125

PHY LinkMD Register

13h

0xN126 - 0xN127

PHY Digital PMA/PCS Status Register

14h

RESERVED

15h

0xN12A - 0xN12B

Port RXER Count Register

16h-1Ah

RESERVED

1Bh

0xN136 - 0xN137

Port Interrupt Control / Status Register

1Ch

0xN138 - 0xN139

PHY Auto MDI / MDI-X Register

1Dh-1Eh

RESERVED

1Fh

0xN13E - 0xN13F

PHY Control Register

TABLE 4-27:

STANDARD MIIM REGISTERS (CONTINUED)

MIIM Standard

(hex)

Port N

(hex)

Description

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