Pmbus Control Register 2 (Pmbctrl2); Pmbus Control Register 2 (Pmbctrl2) Register Field Descriptions - Texas Instruments UCD3138 Technical Reference Manual

PMBus Interface Registers Reference

10.10.7 PMBus Control Register 2 (PMBCTRL2)

PMBus Control Register 2 (PMBCTRL2)
30 29
SLAVE_ADDR_2
_EN*
R/W-0
22 21
RX_BYTE_ACK_CNT
R/W-11
15 14
PEC_
ENA
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 10-11. PMBus Control Register 2 (PMBCTRL2) Register Field Descriptions
Bit Field
30 SLAVE_ADDR_2_
EN*
29-23 SLAVE_ADDR_2*
22-21 RX_BYTE_ACK
_CNT
20 MAN_CMD
19 TX_PEC
18-16 TX_COUNT
390
PMBus Interface/I2C Interface
Figure 10-59. PMBus Control Register 2 (PMBCTRL2)
20
MAN_CMD
R/W-0
SLAVE_MASK
R/W-111 1111
Type Reset
R/W 0
Enable auto detection of the 2nd slave address.
0 = 2nd slave address disabled (default)
1 = 2nd slave address enabled
*Only available on UCD3138A64 and UCD3138128 A and non-A versions
R/W 110 0000 Configures the second device address of the slave. Used in automatic slave address
acknowledge mode (default mode).
*Only available on UCD3138A64 and UCD3138128 A and non-A versions)
R/W 11
Configures number of data bytes to automatically acknowledge when receiving data
in slave mode.
00 = 1 byte received by slave. Firmware is required to manually acknowledge every
received byte.
01 = 2 bytes received by slave. Hardware automatically acknowledges the first
received byte. Firmware is required to manually acknowledge after the second
received byte.
10 = 3 bytes received by slave. Hardware automatically acknowledges the first 2
received bytes. Firmware is required to manually acknowledge after the third
received byte.
11 = 4 bytes received by slave. Hardware automatically acknowledges the first 3
received bytes. Firmware is required to manually acknowledge after the fourth
received byte (Default)
R/W 0
Manual Command Acknowledgement Mode
0 = Slave automatically acknowledges received command code (Default)
1 = Data Request flag generated after receipt of command code, firmware required
to issue ACK to continue message
R/W 0
Asserted when the slave needs to send a PEC byte at end of message. PMBus
Interface will transmit the calculated PEC byte after transmitting the number of data
bytes indicated by TX Byte Cnt(Bits 19:17).
0 = No PEC byte transmitted (Default)
1 = PEC byte transmitted at end of current message
R/W 000
Number of valid bytes in Transmit Data Register
0 = No bytes valid (Default)
1 = One byte valid, Byte #0 (Bits 7:0 of Receive Data Register)
2 = Two bytes valid, Bytes #0 and #1 (Bits 15:0 of Receive Data Register)
3 = Three bytes valid, Bytes #0-2 (Bits 23:0 of Receive Data Register)
4 = Four bytes valid, Bytes #0-3 (Bits 31:0 of Receive Data Register)
Copyright © 2016, Texas Instruments Incorporated
SLAVE_ADDR_2*
R/W-110 0000
19 18
TX_PEC
R/W-0
8 7 6
MAN_SLAVE_
ACK
R/W-0
Description
SNIU028A – February 2016 – Revised April 2016
www.ti.com
23
16
TX_COUNT
R/W-000
SLAVE_ADDR
R/W-111 1100
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