Sensors

Freescale Semiconductor, Inc.

29

MMA16xxKW

4

DSI Protocol Layer

4.1

Communication Interface Overview

The device is compatible with the DSI Bus Standard V2.5.

4.1.1

DSI Physical Layer

Reference DSI Bus Standard V2.5, Section 3 for information regarding the physical layer.

4.1.2

DSI Data Link Layer

Reference DSI Bus Standard,V2.5, Section 4 for information regarding the DSI data link layer. The sections below describe

the DSI data link layer features supported.

4.2

DSI Protocol

4.2.1

DSI Bus Commands

DSI Bus Commands are summarized in Table 11. The device supports only the command formats specified in Section 4.2.1.

The device will ignore commands of any other format. If a CRC error is detected, or a reserved or un-implemented command is

received, the device will not respond.

aration times defined in Section 4.2.1 are met, all supported commands are guaranteed to be executed, and the device will be

ready for the next message. The device will respond as appropriate during the subsequent DSI transfer. Exactly one response

is attempted.

Table 11. DSI Bus Command Summary

Command

Command Format

Data

C3

C2

C1

C0

Hex

Description

D7

D6

D5

D4

D3

D2

D1

D0

0000

$0

Initialization

Standard Long Only

NV

BS

Bnk[1]

Bnk[0]

PA[3]

PA[2]

PA[1]

PA[0]

0001

$1

Request Status

Standard/Enhanced L/S

⎯⎯⎯⎯⎯⎯⎯⎯

0010

$2

Read Acceleration Data

Standard/Enhanced L/S

⎯⎯⎯⎯⎯⎯⎯⎯

0011

$3

Not Implemented

Not Implemented

Not Implemented

0100

$4

Request ID Information

Standard/Enhanced L/S

⎯⎯⎯⎯⎯⎯⎯⎯

0101

$5

Not Implemented

Not Implemented

Not Implemented

0110

$6

Not Implemented

Not Implemented

Not Implemented

0111

$7

Clear

Standard/Enhanced L/S

⎯⎯⎯⎯⎯⎯⎯⎯

1000

$8

Not Implemented

Not Implemented

Not Implemented

1001

$9

Read Write NVM

Standard/Enhanced L

WA[3]

WA[2]

WA[1]

WA[0]

RD[3]

RD[2]

RD[1]

RD[0]

1010

$A

Format Control

Standard/Enhanced L

R/W

FA[2]

FA[1]

FA[0]

FD[3]

FD[2]

FD[1]

FD[0]

1011

$B

Read Register Data

Standard/Enhanced L

0

0

0

0

RA[3]

RA[2]

RA[1]

RA[0]

1100

$C

Disable Self-Test

Standard/Enhanced L/S

⎯⎯⎯⎯⎯⎯⎯⎯

1101

$D

Activate Self-Test

Standard/Enhanced L/S

⎯⎯⎯⎯⎯⎯⎯⎯

1110

$E

Not Implemented

Not Implemented

Not Implemented

1111

$F

Reverse Initialization

Not Implemented

Not Implemented