Texas Instruments DS320PR412-421EVM, User Manual

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2 Description
2.1 Redriver-Mux 5-Level I/O Control Inputs
Each DS320PR412, DS320PR421, SN75LVPE5412 and SN75LVPE5421 features 5-level input pins (MODE,
GAIN/SDA, EQ0/ADDR, EQ1, and RX_DET/SCL) that are used to control the configuration of the device. These
5-level inputs use a resistor divider to help set the five valid levels to provide a wider range of control settings.
Table 2-1. Five-Level Control Pin Settings
PIN LEVEL PIN SETTING
L0 1 kΩ to GND
L1 8.25K Ω to GND
L2 24.9 Ω to GND
L3 75 Ω to GND
L4 Float
2.2 Redriver-Mux Modes of Operation
Each DS320PR412, DS320PR421, SN75LVPE5412 and SN75LVPE5421 can be configured to operate in either
Pin Mode, SMBus Mode, or I2C Slave Mode. The mode of operation of the redriver is determined by the pin
strap setting on the MODE pin as shown in
Table 2-2 .
Table 2-2. Modes of Operation
MODE PIN LEVEL MODE OF OPERATION
L0 Pin Mode
L1 SMBus Mode or I2C Slave Mode
L2 SMBus Mode or I2C Slave Mode
L3 RESERVED
L4 RESERVED
2.3 Redriver-Mux SMBus or I2C Register Control Interface
The DS320PR412, DS320PR421, SN75LVPE5412 and SN75LVPE5421 internal registers can be accessed
through standard SMBus protocol. The DS320PR412, DS320PR421, SN75LVPE5412 and SN75LVPE5421
features two banks of channels, Bank 0 (Channels 0-1) and Bank 1 (Channels 2-3), each featuring a separate
register set and requiring a unique SMBus slave address. The SMBus slave address pairs (one for each channel
bank) are determined at power up based on the configuration of the MODE and EQ0/ADDR pins. The pin state
is read on power up, after the internal power-on reset signal is deasserted.
There are 8 unique SMBus slave address pairs (one address for each channel bank) that can be assigned to
the device by placing external resistor straps on the MODE and EQ0/ADDR pins as shown in
Table 2-3 . When
multiple DS320PR412, DS320PR421, SN75LVPE5412 and SN75LVPE5421 devices are on the same SMBus
interface bus, each channel bank of each device must be configured with a unique SMBus slave address pair.
Table 2-3. Redriver-Mux SMBus Address Map
MODE EQ0/ADDR Pin Level
Channels 0-1:
7-Bit Address [HEX]
Channels 2-3:
7-Bit Address [HEX]
L1 L0 0x18 0x19
L1 L1 0x1A 0x1B
L1 L2 0x1C 0x1D
L1 L3 0x1E 0x1F
L2 L0 0x20 0x21
L2 L1 0x22 0x23
L2 L2 0x24 0x25
L2 L3 0x26 0x27
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4 DS320PR412-421EVM User's Guide SNLU301 – NOVEMBER 2021
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