ADIN2111CCPZ-R7 datasheet(43/129 Pages) AD

43 / 129 page

Data Sheet

ADIN2111

SWITCH SPI

analog.com

Rev. A | 43 of 129

Data Chunks

Transmit data chunks consist of a 4-byte header followed by the

transmit data chunk payload, as shown in Figure 25.

HEADER

32 BITS

TRANSMIT ETHERNET FRAME

PAYLOAD FROM SPI HOST ON MOSI

4 BYTES TRANSMIT HEADER AND CHUNK PAYLOAD BYTES

Figure 25. Transmit Data Chunk

Receive data chunks consist of the receive data chunk payload

followed by a 4-byte footer, as shown in Figure 26.

CHUNK PAYLOAD BYTES AND 4 BYTES RECEIVER HEADER

FOOTER

32 BITS

RECEIVE ETHERNET FRAME

PAYLOAD TO SPI HOST ON MOSI

Figure 26. Receive Data Chunk

The default size of the data chunk payload is 64 bytes. This size

can be configured to 8 bytes, 16 bytes, 32 bytes, or 64 bytes via

the chunk payload selector bits. The data chunk size must be con-

figured before enabling data transmission or reception. Therefore,

when the data chunk size is configured, it must not be changed

without resetting the ADIN2111.

Data Chunk Transactions

Data transactions consist of 1 to N chunks on SDO and SDI. The

4-byte data header occurs at the beginning of each transmit data

chunk on SDO, and the 4-byte data footer occurs at the end of

each data chunk on SDI. These headers and footers contain the

information needed to determine the validity and location of the

transmitted and received frames within the data chunk payload.

The Ethernet frames start at any 32-bit aligned word within the

payloads, as shown in Figure 27 and Figure 28.

TX/MOSI

CASES

EVERY TX

FRAME FIT INTO

CHUNK

FRAMES START AT ANY

32-BIT ALIGNED WORD

WITHIN THE TX DATA

CHUNK PAYLOAD

START OF FRAME

END OF FRAME

TX FRAME

CONCATENATION

NO TX FRAME

CONCATENATION

NO TX DATA

(DV = 0)

NO TX FRAME

CONCATENATION

(GAP IN TX)

TX FRAME ENDS

AT CHUNK

BOUNDARY

CHUNK 1

CHUNK 2

CHUNK 3

CHUNK 4

ETH FR1

ETH FR2

ETH FR1

ETH FR2

ETH FR3

ETH FR4

ETH FR1

Figure 27. Transmit Data Chunk Cases

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