Texas Instruments UCD3138 Technical Reference Manual page 391

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Table 10-11. PMBus Control Register 2 (PMBCTRL2) Register Field Descriptions (continued)
Bit Field
15 PEC_ENA
14-8 SLAVE_MASK
7 MAN_SLAVE
_ACK
6-0 SLAVE_ADDR
SNIU028A – February 2016 – Revised April 2016
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Type Reset
R/W 0
PEC Processing Enable
0 = PEC processing disabled (Default)
1 = PEC processing enabled
R/W 111 1111 Used in address detection, the slave mask enables acknowledgement of multiple
device addresses by the slave. Writing a '0' to a bit within the slave mask enables
the corresponding bit in the slave address to be either '1' or '0' and still allow for a
match. Writing a '0' to all bits in the mask enables the PMBus Interface to
acknowledge any device address. Upon power-up, the slave mask defaults to 7Fh,
indicating the slave will only acknowledge the address programmed into the Slave
Address (Bits 6-0).
R/W 0
Manual Slave Address Acknowledgement Mode
0 = Slave automatically acknowledges device address specified in SLAVE_ADDR,
Bits 6-0 (Default)
1 = Enables the Manual Slave Address Acknowledgement Mode. Firmware is
required to read received address and acknowledge on every message
R/W 111 1100 Configures the current device address of the slave. Used in automatic slave address
acknowledge mode (default mode). The PMBus Interface will compare the received
device address with the value stored in the Slave Address bits and the mask
configured in the Slave Mask bits. If matching, the slave will acknowledge the device
address.
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PMBus Interface Registers Reference
Description
PMBus Interface/I2C Interface
391