3.3.9.1.1 Local I2C Reads/Writes
These functions will perform reads and writes only for the I2C assigned to board.devAddr, which by default will
be the detected address for the DS90UB954-Q1 (or variant).
board.ReadReg(Register
Address , # of Bytes)
OR board.ReadReg(Register
Address)
I2C Read Command
• Accepts both hex & decimal inputs
• Number of bytes will default to 1 if omitted
• Ex: board.ReadReg(0x00) will return the value in Register 0 for the local
device
board.WriteReg(Register
Address , Data)
I2C Write Command
• Accepts both hex & decimal inputs
• Ex: board.WriteReg(0x01, 0x01) will set Register 0 to have a value of 1
board.devAddr = [I2C Address]
Assigns I2C address to be used for board.ReadReg and board.WriteReg
commands
• Accepts both hex & decimal inputs
• Uses the 8-bit form of the I2C address
• Can be used to shorten read/write commands
• Ex: board.devAddress = 0x60 sets the board address to 0x60
3.3.9.1.2 General I2C Reads/Writes:
These I2C commands will work for any I2C address on the local bus and remote devices configured in the slave
ID and slave alias registers of the device. The 8-bit form of I2C addresses should be used.
board.ReadI2C(Device Address,
Register Address , # of Bytes) OR
board.ReadI2C(Device Address,
Register Address)
I2C Read Command
• Accepts both hex & decimal inputs
• Number of bytes will default to 1 if omitted
• Ex: board.ReadI2C(0x60, 0x00) will return the value in Register 0 for
the device with address 0x60 (8-bit form)
board.WriteI2C(Device Address,
Register Address , Data)
I2C Write Command
• Accepts both hex & decimal inputs
• Ex: board.WriteI2C(0x60, 0x01, 0x01) will set Register 1 of the device
with address 0x60 (8-bit form) to have a value of 1
Troubleshooting
SNLU224C – SEPTEMBER 2017 – REVISED APRIL 2021
DS90UB95x-Q1 Serializer Evaluation Module
19
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