ADIN1111CCPZ-R7 datasheet(38/109 Pages) AD

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Data Sheet

ADIN1111

MAC SPI

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Rev. A | 38 of 109

Transmit Data Header

Table 36. Transmit Data Header

D31

D30

D29

D28 to D24

D23 to D22

D21

D20

D19 to D16

D15

D14

D13 to D8

D7 to D6

D5 to D1

SEQ

NORX

RSVD

SWO

RSVD

EBO

TSC

RSVD

See the following definitions:

►

SEQ: data chunk sequence. The sequence functionality is not

supported by the ADIN1111. This bit must be set to 0.

►

NORX: no receive flag. The SPI host can set this bit to indicate

to the MAC-PHY that it does not process receive frame data that

is in the current receive data chunk. For normal operation, set

NORX to 0 to indicate that it accepts and process any receive

frame data within the current chunk.

►

VS: vendor specific bits. This two bits need to be set to 00 by the

host.

►

DV: data valid flag. The SPI host uses this bit to indicate if the

current chunk contains valid transmit data (DV = 1) or not. When

this bit is 0, the MAC-PHY ignores the chunk payload.

►

SV: start valid flag. When this bit is 1, the beginning of an

Ethernet frame is present in the current transmit data chunk

payload. The SV bit is not to be confused with the start of frame

delimiter (SFD) byte described in IEEE Standard 802.3.

►

SWO: start word offset. When SV is 1, this field contains the

32-bit word offset into the transmit data chunk payload that

points to the start of the new Ethernet frame. If SV is 0, the host

must write this field as 0.

►

EV: end valid flag. When this bit is 1, the end of an Ethernet

frame is present in the current transmit data chunk payload.

►

EBO: end byte offset. When EV is 1, this field contains the byte

offset into the transmit data chunk payload that points to the last

byte of the Ethernet frame to transmit. If EV is 0, the host must

write this field as 0.

►

TSC: time stamp capture. Request a time stamp capture when

the frame is transmitted onto the network. See the following:

►

00: no action.

►

01: capture in the pair of TTSCAL and TTSCAH registers. The

TTSCAA bits in the STATUS0 register assert when captured.

►

10: capture in the pair of TTSCBL and TTSCBH registers. The

TTSCAB bits in the STATUS0 register assert when captured.

►

11: capture in the pair of TTSCCL and TTSCCH registers. The

TTSCAC bits in the STATUS0 register assert when captured.

►

P: parity. Parity bit calculated over the transmit data header.

Method is odd parity.

►

RSVD: reserved. Always set to 0.

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