Datasheet

1 Buffer

5 4 3 2 1

1 2 3 4 5

TU request (1)

Element Counter

Element Number

Increasing Address

Memory View

5 4 3 2 1

7 8 9 10

5 4 3 2 1

12 13 14 15

www.ti.com

Module Operation

Figure 24-4. Single Buffer Timing and Memory Representation

Before the application reads the buffer, it has to disable the control packet to avoid that new data

overwrites the buffer while it's being accessed by the application. Regardless of the control packet being

disabled at t1 or t2 the last frame will always be completed, since the trigger request has been received

already. The application can determine any ongoing transfers by the TIPF flag and the NACP bits.

• One Shot Buffer Mode: If TMBA or TMBB is set to one shot buffer mode then the data stream will

stop after all elements of buffer A or buffer B have been transferred. This means that the

corresponding DCP will be disabled after the last frame was transferred to/from buffer A or B and

CFTCTA or CFTCTB decrements to zero.

• Circular Buffer Mode: If TMBA or TMBB is set to circular buffer mode, then the data stream will

continue back at the start of buffer A or B after all elements of buffer A or B have been transferred.The

example of Timing Example for Circular Buffer Mode assumes IETCOUNT=3 (Initial Element Transfer

Count), IFTCOUNT=3 (Initial Frame Transfer Count, SIZE=0 (Size of Transfer = 32-bit) and ADDFM=0

(Addressing Mode Main Memory = Post Increment). So there are in total 9 32-bit values in the buffer. It

also assumes IFADDRx=10h. "U" means uninitialized.

1069

SPNU562–May 2014 High-End Timer Transfer Unit (HTU) Module

Submit Documentation Feedback