ADIN2111BCPZ-R7 datasheet(63/125 Pages) AD

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Data Sheet

ADIN2111

REGISTERS

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Rev. 0 | 63 of 125

Table 62. Bit Descriptions for TX

Bits

Bit Name

Description

Reset

Access

[31:0]

TDR

Transmit Data Register. Writing to this register adds four bytes to the Host Tx FIFO. Note that the last word of a

frame can only contain less than four bytes of data. The hardware uses MAC_TXF_SIZE to determine if there is

one, two, three, or four bytes valid in the last SPI write of a frame. Only used with the generic SPI protocol.

0x0

Tx FIFO Space Register

Address: 0x32, Reset: 0x000007FF, Name: TX_SPACE

Table 63. Bit Descriptions for TX_SPACE

Bits

Bit Name

Description

Reset

Access

[31:14]

RESERVED

Reserved.

0x0

[13:0]

TX_SPACE

Transmit FIFO Space Available in Half Words (16 Bits). This is used by the host software to determine if there is

space in the Tx FIFO for a frame. Note that the software can queue two frames for transmission and simply wait

for a TX_RDY interrupt, or it can fill the Tx FIFO with multiple frames and use TX_SPACE to determine if there

is space for the next frame. Note that an extra two words of space is needed per frame in the host TX FIFO to

store the frame size and header. For example, if TX_SPACE is 64, the maximum size frame that can be written

is (64 − 2) × 2 bytes = 124 bytes. Only used with the generic SPI protocol.

0x7FF

Transmit Threshold Register

Address: 0x34, Reset: 0x00000041, Name: TX_THRESH

Table 64. Bit Descriptions for TX_THRESH

Bits

Bit Name

Description

Reset

Access

[31:12]

RESERVED

Reserved.

0x0

[11:6]

P2P_TX_THRESH

Port to Port Transmit Start Threshold in Cut Through. If port to port cut through

(PORT_CUT_THRU_EN) is enabled, this field determines the threshold in half words (16 bits)

at which frame transmission starts when the frames are forwarded from one port to the other. The

range of valid values for this field is 1 to 26 half words.

0x1

R/W

[5:0]

HOST_TX_THRESH

Host Transmit Start Threshold in Cut Through. When cut through on Tx is enabled

(TX_CUT_THRU_EN = 1), this field is used to set the threshold in half words (16 bits) at which

frame transmission starts for frames coming from the host. The range of valid values for this field is

1 to 26 half words.

0x1

R/W

LES Tx Priority Register

Address: 0x35, Reset: 0x00000000, Name: TX_PRI

Table 65. Bit Descriptions for TX_PRI

Bits

Bit Name

Description

Reset

Access

[31:3]

RESERVED

Reserved.

0x0

[2:0]

TX_HOST_PRI

Host Transmit Priority. When frames are queued to egress a port from both the host and the other port at the

same time, this field determines the ratio of access to the port. For example, if there is a stream of 128-byte

frames from Port 1 to Port 2, and the host is transmitting a stream of 128-byte frames on Port 2, and this field

is set to H50_P50, 50% of the frames transmitted are from the host.

0x0

R/W

The ratio is based on comparing the recent number of bytes transmitted from the host and the other port. 3

options are available: H50_P50, H100_P0, or H0_P100. Values outside of those listed below are reserved.

000: 50/50 host/port.

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