7 Detailed Description

7.1 Overview

The DS320PR822 is an eight-channel multi-rate linear repeater with integrated signal conditioning. The device's

signal channels operate independently from one another. Each channel includes a continuous-time linear

equalizer (CTLE) and a linear output driver, which together compensate for a lossy transmission channel

between the source transmitter and the final receiver. The linearity of the data path is specifically designed to

preserve any transmit equalization while keeping receiver equalization effective.

The DS320PR822 can be configured three different ways:

Pin mode – device control configuration is done solely by strap pins. Pin mode is expected to be good enough

for many system implementation needs.

SMBus/I2C Primary mode – device control configuration is read from external EEPROM. When the

DS320PR822 has finished reading from the EEPROM successfully, it will drive the ALL_DONE_N pin LOW.

SMBus/I2C secondary operation is available in this mode before, during, or after EEPROM reading. Note: during

EEPROM reading, if the external SMBus/I2C primary wants to access DS320PR822 registers, then it must

support arbitration. The mode is preferred when software implementation is not desired.

SMBus/I2C Secondary mode – provides most flexibility. Requires a SMBus/I2C primary device to configure

DS320PR822 though writing to its secondary address.

DS320PR822

SNLS714 – SEPTEMBER 2022

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