AN452

16

Rev. 0.1

Returns:

none

Description:

This function processes a request service primitive, generates a valid C-field by setting the FCV, FCB, and PRM

bits, transmits the request frame, checks for confirm/response if applicable, and retries data transmission when

appropriate (Send/Confirm, Request/Respond when valid ack/nack is not received).

Flow Chart:

Prepare Frame

(FCV, FCB, PRM)

Transmit Frame

Attempt <=

MaxRetries?

Status = LINK_STATUS_TX_RETRY_ERROR

Positive = FALSE

No

Ack/Nack

Requested?

Transmit

Successful ?

Status = (Error)

Positive = FALSE

No

Yes

Status = LINK_STATUS_SUCCESS

Positive = TRUE

No

Receive Frame

(max – min

response delay)

Valid Ack /

Response?

Status = LINK_STATUS_SUCCESS

Positive = TRUE

Yes

Wait min response

delay

Yes

Wait min response

delay

Yes

Insufficient

Buffer Size?

No

Status = LINK_STATUS_INVALID_SIZE

Positive = FALSE

Yes

Valid Nack?

Status = LINK_STATUS_SUCCESS

Positive = FALSE

No

Yes

No