TMS320UC5402 datasheet(22/63 Pages) TI

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TMS320UC5402

FIXED-POINT DIGITAL SIGNAL PROCESSOR

SPRS096A – APRIL 1999 – REVISED DECEMBER 1999

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

DMA interrupts

The ability of the DMA to interrupt the CPU based on the status of the data transfer is configurable and is

determined by the IMOD and DINM bits in the DMA mode control register (DMMCRn). The available modes

are shown in Table 6.

Table 6. DMA Interrupts

MODE

DINM

IMOD

INTERRUPT

ABU (non-decrement)

At full buffer only

ABU (non-decrement)

At half buffer and full buffer

Multi-Frame

At block transfer complete (DMCTRn = DMSEFCn[7:0] = 0)

Multi-Frame

At end of frame and end of block (DMCTRn = 0)

Either

No interrupt generated

Either

No interrupt generated

DMA controller synchronization events

The transfers associated with each DMA channel can be synchronized to one of several events. The DSYN bit

field of the DMA channel x sync select and frame count (DMSFCx) register selects the synchronization event

for a channel. The list of possible events and the DSYN values are shown in Table 7.

Table 7. DMA Synchronization Events

DSYN VALUE

DMA SYNCHRONIZATION EVENT

0000b

No synchronization used

0001b

McBSP0 receive event

0010b

McBSP0 transmit event

0011–0100b

Reserved

0101b

McBSP1 receive event

0110b

McBSP1 transmit event

0111b–0110b

Reserved

1101b

Timer0 interrupt

1110b

External interrupt 3

1111b

Timer1 interrupt

DMA channel interrupt selection

The DMA controller can generate a CPU interrupt for each of the six channels. However, channels 1, 2, and

3 are multiplexed with other interrupt sources. DMA channels 2 and 3 share an interrupt line with the receive

and transmit portions of McBSP1 (IMR/IFR bits 10 and 11), and DMA channel 1 shares an interrupt line with

timer 1 (IMR/IFR bit 7). When the ’UC5402 is reset, the interrupts from these three DMA channels are

deselected. The INTSEL bit field in the DMA channel priority and enable control (DMPREC) register can be used

to select these interrupts, as shown in Table 8.

Table 8. DMA Channel Interrupt Selection

INTSEL Value

IMR/IFR[7]

IMR/IFR[10]

IMR/IFR[11]

00b (reset)

TINT1

BRINT1

BXINT1

01b

TINT1

DMAC2

DMAC3

10b

DMAC1

DMAC2

DMAC3

11b

Reserved

TMS320UC5402 Datasheet(PDF) 22 Page - Texas Instruments

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