ADIN1300CCPZ-R7 datasheet(19/96 Pages) AD

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Data Sheet

ADIN1300

THEORY OF OPERATION

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Rev. B | 19 of 96

OVERVIEW

The ADIN1300 is a low power, single port, Gigabit Ethernet trans-

ceiver with low latency specifications primarily designed for indus-

trial Ethernet applications. This design integrates an EEE PHY

core and all associated common analog circuitry, input and output

clock buffering, management interface and subsystem registers,

and MAC interface and control logic to manage the reset and clock

control and hardware pin configuration.

The ADIN1300 interfaces directly to twisted pair media through an

external transformer and is capable of supporting cable lengths up

to 150 meters at Gigabit speeds and 180 meters when operating at

100 Mbps or 10 Mbps speeds.

When the 10 Mbps speed is selected, the device operates by

default in 10BASE-Te mode using the 10BASE-Te transmit levels.

The ADIN1300 can be configured via software (using the B10eEn

bit, see Table 104) to operate 10BASE-T mode using the larger

10BASE-T transmit levels. The only difference between 10BASE-Te

and 10BASE-T is the transmit level. A PHY configured as 10BASE-

Te interoperates with a 10BASE-T PHY, assuming a normal Cat-5

cable is used.

The ADIN1300 provides a suite of diagnostic features enabling the

user to analyze the quality of the link during operation or while the

link is down.

Figure 19 shows a simplified overview of the main channel blocks.

ANALOG FRONT END (AFE)

The AFE stage consists of a hybrid stage, a programmable gain

amplifier (PGA), and an analog-to-digital convertor (ADC). The

function of the hybrid stage is to remove the transmitted signal

from the input signal, thereby allowing full-duplex operation on the

twisted pair. The PGA stage scales the incoming signal before it

reaches the ADC. The gain stage is controlled and adjusted based

on the output of the ADC to ensure the signal applied to the ADC is

maximized but within range of the ADC.

Physical Media Attachment (PMA)

The PMA block consists of the feed forward equalizer (FFE) stage,

which removes intersymbol interference (ISI).

The twisted pairs of Ethernet cables are not internally shielded from

each other, so signals transmitted on one pair couple across to the

other pairs. When a transmitter does not match to the line due to

mismatches or cable connectors, reflections are observed as an

echo. The echo and crosstalk estimates are subtracted from the

equalizer output.

Baseline wander is an artifact of the external transformer that

attenuates at low frequencies. When there are many symbols

with the same sign transmitted consecutively, the signal at the

receiver reduces. The baseline wander block monitors and corrects

to ensure the likelihood of receiving a symbol error is reduced.

Transmit Functions

1000BASE-T Mode

In 1000BASE-T, the PHY core encodes 8-bit data for transmission

by the PMA as a 4D five-level pulse amplitude modulation (PAM)

signal over the four pairs of cable.

100BASE-TX Mode

For the 100BASE-TX mode, the 4-bit data is first encoded into a

5-bit serial bit stream running at 125 Mbps. This is then sent to the

scrambler where it is encoded to a three-level multilevel transmit

(MLT3) format for transmission by the PMA.

10BASE-Te Mode

For the 10BASE-Te mode, the PHY transmits and receives Man-

chester-encoded data.

Receive Functions

1000BASE-T Mode

The PMA decodes the incoming 4D PAM signals into 8-bit data.

After performing compensation and after additional cleanup, the

PMA outputs the data to the receive pins of the MAC interface.

100BASE-TX Mode

The PMA decodes the incoming 3-level MLT3 sequence into 4‑bit

data after descrambling and 5-bit to 4-bit decoding.

10BASE-Te Mode

The core decodes the Manchester-encoded received signal.

Figure 19. Simplified Channel Block Diagram

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