MCT8317A datasheet(68/161 Pages) TI1

68 / 161 page

MEM_SEC – Memory Section: Each memory location in MCT8317A is addressed using three separate entities

in the control word – Memory Section, Memory Page, Memory Address. Memory Section is a 4-bit field which

denotes the memory section to which the memory location belongs like RAM, ROM etc.

MEM_PAGE – Memory Page: Memory page is a 4-bit field which denotes the memory page to which the

memory location belongs.

MEM_ADDR – Memory Address: Memory address is the last 12-bits of the address. The complete 22-bit

address is constructed internally by MCT8317A using all three fields – Memory Section, Memory Page, Memory

Address. For memory locations 0x000000-0x000800, memory section is 0x0, memory page is 0x0 and memory

address is the lowest 12 bits(0x000 for 0x000000, 0x080 for 0x000080 and 0x800 for 0x000800)

Data Bytes: For a write operation to MCT8317A, the 24-bit control word is followed by data bytes. The DLEN

field in the control word should correspond with the number of bytes sent in this section.

CRC Byte: If the CRC feature is enabled in the control word, CRC byte has to be sent at the end of a write

transaction. Procedure to calculate CRC is explained in CRC Byte Calculation below.

8.6.2.2 I2C Write Operation

MCT8317A write operation over I2C involves the following sequence.

1. I2C start condition.

2. The sequence starts with I2C target start byte, made up of 7-bit target ID (0x00) to identify the MCT8317A

along with the R/W bit set to 0.

3. The start byte is followed by 24-bit control word. Bit 23 in the control word has to be 0 as it is a write

operation.

4. The 24-bit control word is then followed by the data bytes. The length of the data byte depends on the DLEN

field.

a. While sending data bytes, the LSB byte is sent first. Refer below examples for more details.

b. 16-bit/32-bit write – The data sent is written to the address mentioned in Control Word.

c. 64-bit Write – 64-bit is treated as two 32-bit writes. The address mentioned in Control word is taken as

Addr 0. Addr 1 is calculating internally by MCT8317A by incrementing Addr 0 by 2. A total of 8 data

bytes are sent. The first 4 bytes (sent in LSB first way) are written to Addr 0 and the next 4 bytes are

written to Addr 1.

5. If CRC is enabled, the packet ends with a CRC byte. CRC is calculated for the entire packet (Target ID + W

bit, Control Word, Data Bytes).

6. I2C stop condition.

TARGET

ID [6:0]

CONTROL

WORD [23:16]

ACK

DATA

BYTES

Write – without CRC

2 / 4 / 8 DATA BYTES

ACK

CONTROL

WORD [15:8]

ACK

CONTROL

WORD [7:0]

ACK

DATA

BYTES

ACK

TARGET

ID [6:0]

CONTROL

WORD [23:16]

ACK

DATA

BYTES

Write – with CRC

2 / 4 / 8 DATA BYTES

ACK

CONTROL

WORD [15:8]

ACK

CONTROL

WORD [7:0]

ACK

CRC

DATA

BYTES

ACK

CRC includes {TARGET ID,0}, CONTROL WORD[23:0], DATA BYTES

Figure 8-47. I2C Write Operation Sequence

8.6.2.3 I2C Read Operation

MCT8317A read operation over I2C involves the following sequence.

1. I2C start condition.

2. The sequence starts with I2C target Start Byte.

MCT8317A

SLLSFQ2 – JANUARY 2023

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