ADIN1111CCPZ-R7 datasheet(37/109 Pages) AD

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Data Sheet

ADIN1111

MAC SPI

analog.com

Rev. A | 37 of 109

Data Chunks

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

transmit data chunk payload, as shown in Figure 29.

Figure 29. Transmit Data Chunk

Receive data chunks consist of the receive data chunk payload

followed by a 4-byte footer, as shown in Figure 30

Figure 30. 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 MAC-PHY.

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 31 and Figure 32.

Figure 31. Transmit Data Chunk Cases

Figure 32. Receive Data Chunk Cases

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