SPRUII0F May 2019 – June 2024 TMS320F28384D , TMS320F28384D-Q1 , TMS320F28384S , TMS320F28384S-Q1 , TMS320F28386D , TMS320F28386D-Q1 , TMS320F28386S , TMS320F28386S-Q1 , TMS320F28388D , TMS320F28388S
On the transmitter, the ping frame is the only frame that can be set up and transmitted without any further software or DMA intervention. Ping frames can be transmitted by any (or all) of the three sources: automatic ping timer, software, or external triggers.
Each available frame type can be sent multiple ways. Generically, the following steps must be executed before the frame is sent. These steps can be executed in any order before the start condition is set.
A new frame transmission can be initiated by one of the methods selected in the TX_OPER_CTRL_LO.START_MODE bits. If there is already a PING frame transmission taking place, due to a hardware initiated PING timer, the new frame transmission begins as soon as the on-going PING transmission is completed.
Once a START of frame has been initiated, the next START of frame is recognized when the first frame has started transmitting the End-of-Frame (EOF) field. If a new START trigger arrives before the current transmission has reached the EOF field, the trigger is lost without a notification.
There is no hardware check implemented to check whether the type field written by software is valid or not. If an invalid type is used and a frame transmission is initiated, the behavior is:
This mechanism can be used for force a Type error in a received frame for testing purposes.
The following sections describe the specific configuration for each frame type and start condition.