ADIN2111CCPZ-R7 datasheet(41/125 Pages) AD

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Data Sheet

ADIN2111

SWITCH SPI

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Rev. 0 | 41 of 125

RX/MOSI

CASES

EVERY RX

FRAME FIT INTO

CHUNK

FRAMES START AT ANY

32-BIT ALIGNED WORD

WITHIN THE RX DATA

CHUNK PAYLOAD

START OF FRAME

END OF FRAME

RX FRAME

CONCATENATION

NO RX FRAME

CONCATENATION

NO TX DATA

(DV = 0)

NO RX FRAME

CONCATENATION

(GAP IN TX)

RX 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. Receive Data Chunk Cases

Transmit Data Header

Table 35. 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 ADIN2111. This bit must be set to 0.

►

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

to the ADIN2111 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 processes any receive

frame data within the current chunk.

►

VS: vendor specific bits.

►

VS[1]: unused, to be set to 0 by the host.

►

VS[0]: frame destination port.

►

0: frame destination is Port 1.

►

1: frame destination is Port 2.

►

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 ADIN2111 ignores the chunk payload.

►

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

net frame is present in the current transmit data chunk payload.

Do not confuse the SV bit 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 the TTSCAL and TTSCAH registers.

The TTSCAA bits in the STATUS0 register assert when cap-

tured.

►

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

The TTSCAB bits in the STATUS0 register assert when cap-

tured.

►

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

The TTSCAC bits in the STATUS0 register assert when cap-

tured.

►

P: parity. The parity bit is calculated over the transmit data

header. The method is odd parity.

►

RSVD: reserved. Always set to 0.

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