ADP1052ACPZ-R7 datasheet(49/113 Pages) AD

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Data Sheet

ADP1052

Rev. B | Page 49 of 113

Host Sends Too Many Bytes

If a host sends more bytes than are expected for the corresponding

command, the PMBus slave considers this a data transmission

fault and responds as follows:

1. Issues a no acknowledge for all unexpected bytes as they

are received.

2. Flushes and ignores the received command and data.

3. Sets the CML bit in the STATUS_BYTE command register

(Register 0x78[1]).

Host Reads Too Many Bytes

If a host reads more bytes than are expected for the corresponding

command, the PMBus slave considers this a data transmission

fault and responds as follows:

1. Sends all 1s (0xFF) for as long as the host continues to

request data.

2. Sets the CML bit in the STATUS_BYTE command register

(Register 0x78[1]).

Device Busy

The PMBus slave device is too busy to respond to a request

from the master device. This condition is not supported in the

ADP1052.

DATA CONTENT FAULTS

Data content faults may occur when the 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

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

bit cleared to 0, followed by the command code. If a host starts a

PMBus transaction with R/W set in the address phase (equiva-

lent to an I2C read), the PMBus slave considers this a data

content fault and responds as follows:

1. Acknowledges (ACK or A) the address byte.

2. Issues a no acknowledge (NACK or A) for the command

and data bytes.

3. Sends all 1s (0xFF) as long as the host continues to request

data.

4. Sets the CML bit in the STATUS_BYTE command register

(Register 0x78[1]).

Invalid or Unsupported Command Code

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:

1. Issues a no acknowledge (NACK or A) for the

illegal/unsupported command byte and data bytes.

2. Flushes and ignores the received command and data.

3. Sets the CML bit in the STATUS_BYTE command register

(Register 0x78[1]).

Reserved Bits

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

are ignored, and reads from reserved bits return undefined data.

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:

1. Issues a no acknowledge (NACK or A) for all unexpected

data bytes as they are received.

2. Flushes and ignores the received command and data.

3. Sets the CML bit in the STATUS_BYTE command register

(Register 0x78[1]).

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

Many Bytes 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:

1. Sends all 1s (0xFF) for as long as the host continues to

request data.

2. Sets the CML bit in the STATUS_BYTE command register

(Register 0x78[1]).

Note that this is the same error response that is described in the

Host Reads Too Many Bytes section.

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