EP80579 Datasheet, PDF (925/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Table 24-40. Block Read/Write Protocol without PEC (Sheet 2 of 2)
...
Data Byte N from slave - 8 bits
...
NOT Acknowledge
...
Stop
The protocol for the block write and block read with PEC is shown in Table 24-41.
The block write command with I2C_EN set and the PEC_EN bit set produces undefined
results. Software must force the PEC_EN bit to 0 when running this command.
Table 24-41. Block Read/Write Protocol with PEC
Block Write Protocol
Block Read Protocol
Bit
Description
1
Start
2 – 8 Slave Address - 7 bits
9
Write
10
Acknowledge from slave
11 – 18 Command code - 8 bits
19
Acknowledge from slave
20 – 27 Byte Count - 8 bits
28
Acknowledge from Slave
29 – 36 Data Byte 1 - 8 bits
37
Acknowledge from Slave
38 – 45 Data Byte 2 - 8 bits
46
Acknowledge from slave
...
Data Bytes / Slave Acknowledges...
...
Data Byte N - 8 bits
...
Acknowledge from Slave
...
PEC – 8 bits
...
Acknowledge from Slave
...
Stop
Bit
Description
1
Start
2 – 8 Slave Address - 7 bits
9
Write
10 Acknowledge from slave
11 – 18 Command code - 8 bits
19 Acknowledge from slave
20 Repeated Start
21 – 27 Slave Address - 7 bits
28 Read
29 Acknowledge from slave
30 – 37 Byte Count from slave - 8 bits
38 Acknowledge
39 – 46 Data Byte 1 from slave - 8 bits
47 Acknowledge
48 – 55 Data Byte 2 from slave - 8 bits
56 Acknowledge
...
Data Bytes from slave/Acknowledge
...
Data Byte N from slave - 8 bits
...
Acknowledge
...
PEC from slave – 8 bits
...
NOT Acknowledge
...
Stop
24.4.2.7 I²C Read
This command allows the CMI to perform block reads to certain I2C devices, such as
serial E2PROMs. The SMBus Block Read supports the 7-bit addressing mode only.
However this doesn’t allow access to devices that need to use the I²C “Combined
Format” that has data bytes after the address. Typically these data bytes correspond to
an offset (address) within the serial memory chips.
The I²C Read command with either PEC_EN or AAC bit set produces undefined results.
Software must force both PEC_EN and AAC bits to 0 when running this command.
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
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