ADIN1111CCPZ-R7 datasheet(41/109 Pages) AD

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Data Sheet

ADIN1111

MAC SPI

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Rev. A | 41 of 109

Figure 33. OPEN Alliance Control Transaction

Control Read

The MAC-PHY ignores all data from the SPI host following the control header for the rest of the control read command. Control read commands

can read either a single or multiple registers. When multiple registers are read, the address is automatically post-incremented according to the

address increment disable bit in the control header.

Figure 34. Control Read Transaction

OPEN Alliance SPI Errors

See the following OPEN Alliance SPI errors:

►

SPI Header Parity Error. If a parity error is detected on a transmit

header and there is a transmit frame in the process of being

transferred over SPI, this frame is dropped. If the MAC is operat-

ing in cut through mode, the frame transmit stops and a bad

CRC is appended to the frame.

The MAC-PHY returns a fixed value of 0x4000_0000 in every

word until CS goes high. The MAC-PHY responds with DV = 1,

EV = 1, EBO = 0, and FD = 1 in the first data footer following a

new assertion of CS.

If there is a parity error on a control transaction, the operation

does not complete. Software can determine which transaction

caused the error as the MAC-PHY returns a fixed 0x4000_0000

on SDO for the duration of the SPI transaction. Software can

then resend the corrupted control transaction after clearing the

header error bit.

►

Transmit Protocol Error. Occurs when the MAC-PHY detects

protocol errors in the transfer of transmit data chunks. These

errors are usually due to SPI host firmware issues and do not

occur in normal operation. The transmit protocol error bit is set

when a data header received by the MAC-PHY indicates data

valid (DV = 1) without a prior start of frame indication (SV = 1),

in which case the data chunk is ignored. Or, when the MAC-PHY

receives two data headers indicating a start of frame (SV =

1) without and end of frame (EV = 1), the MAC-PHY drops

the frame data from the previous start of frame indicator and

begins accepting the frame data from the second start of frame

indicator.

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