UM0239 datasheet(35/44 Pages) STMICROELECTRONICS

35 / 44 page

UM0239

Ping sessions

35/44

Figure 20.

Ping slave loop

Ping start

Ping Slave settings:

•SLAVE ADDRESS

•MAC (MEDIUM ACCESS CONTROL)

MAX WAIT SLOT NR.

MAX WAIT TIME

Ping Slave Total Message Data:

•LAST MSG REC.

•TOT OK MSG

•TOT CORR MSG

•TOT RX MORE MSG

•TOT WR FCS MSG

Message

detected ?

YES

SLAVE

ADDRESS

correct?

FCS

calculated equal

to FCS

received?

YES

TOT OK MSG

‡

Use FEC and

calculate a

new FCS

New FCS

equal to FCS

of corrected

message?

TOT RX MSG = 0

TOT OK MSG = 0

TOT CORR MSG = 0

TOT RX MORE MSG = 0

TOT WR FCS MSG = 0

MSG number = 0 ?

YES

Message

already

received?

YES

Transmit

message

MAC enable ?

MAC equal to

PD and Control

to CD?

YES

Calculate FCS

YES

Message

already

received?

YES

TOT RX MORE

MSG ‡ 1

TOT CORR

MSG ‡ 1

TOT WR FCS

MSG ‡ 1

Get LAST MSG REC

and create reply message

Set Control

Wait RAND time

(from 1 to Max

Wait Slot No. * 4 ms)

Line busy

and Max Wait Time

not elapsed?

UM0239 Datasheet(PDF) 35 Page - STMicroelectronics

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