ADIN1300CCPZ-R7 datasheet(31/79 Pages) AD

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Data Sheet

ADIN1300

Rev. 0 | Page 31 of 79

FRAME GENERATOR AND CHECKER

The ADIN1300 can be configured to generate frames and to check

received frames (see Figure 28). The frame generator and checker

can be used independently to just generate frames or just check

frames or can be used together to simultaneously generate frames

and check frames. If frames are looped back at the remote end,

the frame checker can be used to check frames generated by the

ADIN1300.

When the frame generator is enabled, the source of data for the

PHY comes from the frame generator and not the MAC interface.

To use the frame generator, the diagnostic clock must also be

enabled (DIAG_CLK_EN bit, PHY_CTRL_1 register,

Address 0x0012).

The frame generator control registers configure the type of

frames to be sent (random data, all 1s), the frame length, and

the number of frames to be generated. The generation of the

requested frames starts by enabling the frame generator (set the

FG_EN bit, Address 0x9415). When the generation of the

frames is completed, the frame generator done bit is set

(FG_DONE bit, Address 0x941E).

The frame checker is enabled using the frame checker enable bit

(FC_EN bit, Address 0x9403). The frame checker can be

configured to check and analyze received frames from either the

MAC interface or the PHY, which is configured using the frame

checker transmit select bit (FC_TX_SEL bit, Address 0x9407).

The frame checker reports the number of frames received, cyclic

redundancy check (CRC) errors, and various other frame

errors. The frame checker frame counter register and frame

checker error counter register count these events.

The frame checker counts the number of CRC errors and these

are reported in the receive error counter register (RX_ERR_CNT

the frame checker error counter and frame checker frame

counters, all of the counters are latched when the receive error

counter register is read. Therefore, when using the frame checker,

read the receive error counter first, and then read all other

frame counters and error counters. A latched copy of the receive

frame counter register is available in the FC_FRM_CNT_H

Address 0x940B, respectively).

In addition to CRC errors, the frame checker counts frame length

errors, frame alignment errors, symbol errors, oversized frame

errors, and undersized frame errors. In addition to the received

frames, the frame checker counts frames with an odd number of

nibbles in the frame in 100BASE-TX mode or 10BASE-Te

mode, and counts frames with an odd number of nibbles in the

preamble in 100BASE-TX mode. The frame checker also counts

frames with a noninteger number of nibbles in 10BASE-Te

mode and the number of false carrier events, which is a count of

the number of times the bad start of stream delimiter (SSD)

state is entered.

Frame Generator and Checker used with Remote

Loopback with Two PHYs

Using two PHY devices, the user can configure a convenient self

contained validation of the PHY to PHY connection. Figure 29

shows an overview of how each PHY is configured. An external

Ethernet cable is connected between both devices, and PHY1 is

generating frames using the frame generator. PHY2 has remote

loopback enabled on the MAC side. The frames issued by PHY1

are sent through the cable, through the PHY2 signal chain

returned by PHY2 remote loopback, back again through the

Ethernet cable, and checked by the PHY1 frame checker.

PHY 1

PHY 2

RJ45

FRAME

CHECKER

FRAME

GENERATOR

EXTERNAL

CABLE

LOOPBACK

MAGNETICS

MAC

INTERFACE

PHY

AFE

PHY

DIGITAL

RJ45

FRAME

CHECKER

MAGNETICS

MAC

INTERFACE

PHY

AFE

PHY

DIGITAL

Figure 29. Remote Loopback used across Two PHYs for Self Check Purposes

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