L99LDLH32 datasheet(52/142 Pages) STMICROELECTRONICS

52 / 142 page

Communication interface

L99LDLH32

52/142

DS12879 Rev 6

For Write access the Payload represents the new data written to the address registers.

For Read Operation the Payload is not used. For functional safety reasons it is

recommended to set unused Payload to ‘0’.

For Read & Clear operation the Payload indicate the clearance of specific bits in the Status

bits set to ‘1’.

Figure 24. Unicast diagnosis request frame

As shown in Figure 24, the Commander addresses a Responder by its “Responder ID” in

CAN FD ID.

6.6.2

Unicast response frame

The Responders answer with a diagnosis response frame to the Commander’s diagnosis

request frame (see Figure 25). The CAN FD frame ID is the Responder ID preceded by “01”

to distinguish the Responder answer from the Commander request.

The Commander must send a synchronization frame - according to Chapter 6.5.5 - after

each responder replies (but only if the addressed devices change in the next commander

frame), to ensure the responders are synchronized to the commander and the frames sent

by the commander are correctly received by all responders.

Figure 25. Unicast diagnosis response frame

6.6.3

Global Status Byte (GSB)

The Global Status Byte is described here below.

"00",Responder ID [8:0]

CTRL

OP Code, Address

Data Byte 1

Data Byte 2

...

CRC

ACK/EOF

"01",Responder ID [8:0]

CTRL

Global Status Byte (GSB)

Data Byte 1

Data Byte 2

...

CRC

ACK/EOF

Figure 26. Global Status Byte

Bit

Name

GSBN

RSTB

FE2

FE1

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