ADIN2111BCPZ-R7 datasheet(40/129 Pages) AD

40 / 129 page

Data Sheet

ADIN2111

SWITCH SPI

analog.com

Rev. A | 40 of 129

5. Write a start time to the TS_TIMER_START register. When the

nanoseconds counter matches this value, TS_TIMER starts to

toggle.

6. To stop TS_TIMER, write 1 to the TS_TIMER_STOP bit in

TS_CFG. TS_TIMER returns to the default value as set by

TS_TIMER_DEF bit in TS_CFG. To start the timer again, write

to the TS_TIMER_START register.

Note that If P1_LED_0 is used as the TS_TIMER output, the

default value is dependent on the P1_LED_0 polarity set by the

LED0_POLARITY bit field.

Transmit Frame over SPI

The following sequence must be followed when using the generic

SPI protocol in store and forward mode (the ADIN2111 operates in

cut through mode on the SPI by default):

1. Verify that there is space for the frame by reading the transmit

FIFO space register. The internal MAC internally appends a

2-byte size field to the frame in the FIFO. Therefore, ensure that

there is sufficient space for the Ethernet frame plus the 2-byte

header and 2-byte size field.

2. Write the size of the frame in bytes, including the 2-byte header

to the MAC transmit frame size register. If the host appended a

frame check sequence (FCS) to the frame, this is also included

in the size.

3. Write the frame data including the 2-byte frame header to the

transmit FIFO using the MAC transmit register. The first byte for

transmission is written to TXD, Bits[31:24]. The full frame can

be written in a single burst or split up into multiple smaller burst

writes. The burst write data must always be in multiples of four

bytes. That is, the last word (four bytes) can contain between

one byte and four bytes of valid data.

4. When the end of frame (EOF) byte of a frame is read from the

transmit FIFO, the bit transmit ready asserts, and an interrupt

triggers if the TX_RDY_MASK is set.

Figure 22. MAC Frame: Transmit

RECEIVE: 2-BYTE FRAME HEADER READ FIRST FROM THE P1_RX REGISTER

SDI

3 BYTES

SDO

2-BYTE FRAME

HEADER

RECEIVE FRAME DATA

CD-PROT-

R/W-ADDR-TA

Figure 23. MAC Frame: Receive

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