Intel C2518 FH8065501516710 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

September 2014

Datasheet, Vol. 2 of 3

Order Number: 330061-002US

435

The Block Write-Block Read Process Call command is a two-part message. The call 

begins with a slave address and a write condition. After the command code, the host 

issues a write byte count (M) that describes how many more bytes are written in the 

first part of the message. If a master has 6 bytes to send, the byte count field has the 

value 6 (0000 0110b), followed by the 6 bytes of data. The write byte count (M) cannot 

be 0.

The second part of the message is a block of read data beginning with a repeated start 

condition followed by the slave address and a read bit. The next byte is the read byte 

count (N), which differs from the write byte count (M). The read byte count (N) cannot 

be 0.

The combined data payload must not exceed 32 bytes. The byte-length restrictions of 

this process call are summarized as follows:

• M  1 byte
• N  1 byte
• M  +  N   32 bytes

No STOP condition is before the repeated START condition, and that a NACK signifies 

the end of the read transfer.

See Section 5.5.8 of the System Management Bus (SMBus) Specification, Version 2.0 

for the format of the protocol.