ADP1055ACPZ-R7 datasheet(52/140 Pages) AD

52 / 140 page

ADP1055

Data Sheet

Rev. A | Page 52 of 140

DATA CONTENT FAULTS

Data content faults occur when data transmission is successful,

but the PMBus slave device cannot process the data that is

received from the master device.

Improperly Set Read Bit in the Address Byte (Item 10.9.1)

All PMBus commands start with a slave address with the R/W

bit cleared to 0, followed by the command code. The only

exception is the transmission of the SMBus alert response

address (0001 to 100x). If a host starts a PMBus transaction

with R/W set in the address phase (equivalent to an I2C read),

the PMBus slave considers this a data content fault and

responds as follows:



Send an acknowledge (ACK) for the address byte.



Send a no acknowledge (NACK) for the command and

data bytes.



Send all 1s (0xFF) as long as the host continues to request

data.



Set the CML bit (Bit 1) in the STATUS_BYTE register.



Set the Other bit (Bit 1) in the STATUS_CML register.



Notify the host through SMBALRT, if enabled.

Invalid or Unsupported Command Code (Item 10.9.2)

If an invalid or unsupported command code is sent to the

PMBus slave, the code is considered to be a data content fault,

and the PMBus slave responds as follows:



Send a no acknowledge (NACK) for the illegal/

unsupported command byte and data bytes.



Flush and ignore the received command and data.



Set the CML bit (Bit 1) in the STATUS_BYTE register.



Set the invalid/unsupported command bit (Bit 7) in the

STATUS_CML register.



Notify the host through SMBALRT, if enabled.

Invalid or Unsupported Data (Item 10.9.3)

If invalid or unsupported data is sent to the PMBus slave (for

certain commands), the PMBus slave considers this to be a data

content fault and responds as follows:



Send an acknowledge (ACK) for the unsupported data

bytes (cannot send a no acknowledge (NACK) for the data

because the decoding happens only after the data is

acknowledged and sent to the decoding unit).



Flush and ignore the received command and data.



Set the CML bit (Bit 1) in the STATUS_BYTE register.



Set the invalid/unsupported data received bit (Bit 6) in the

STATUS_CML register.



Notify the host through SMBALRT, if enabled.

Data Out of Range Fault (Item 10.9.4)

Data sent to the PMBus slave that is out of range is treated as a

data content fault. See the Invalid or Unsupported Data (Item

10.9.3) section for the actions taken by the PMBus device.

Reserved Bits (Item 10.9.5)

Accesses to reserved bits are not a fault. Writes to reserved bits

are ignored, and reads from reserved bits return 0s.

Write to Read-Only Commands

If a host performs a write to a read-only command, the PMBus

slave considers this a data content fault and responds as follows:



Send a no acknowledge (NACK) for all unexpected data

bytes as they are received.



Flush and ignore the received command and data.



Set the CML bit (Bit 1) in the STATUS_BYTE register.



Set the invalid/unsupported data received bit (Bit 6) in the

STATUS_CML register.



Notify the host through SMBALRT, if enabled.

Note that this is the same error described in the Host Sends Too

Many Bytes (Item 10.8.5) section.

Read from Write-Only Commands

If a host performs a read from a write-only command, the PMBus

slave considers this a data content fault and responds as follows:



Send all 1s (0xFF) as long as the host continues to request

data.



Set the CML bit (Bit 1) in the STATUS_BYTE register.



Set the Other bit (Bit 1) in the STATUS_CML register.

Note that this is the same error described in the Host Reads Too

Many Bytes (Item 10.8.6) section.

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