TMS320C6421 datasheet(83/227 Pages) TI

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TMS320C6421

Fixed-Point Digital Signal Processor

SPRS346B – JANUARY 2007 – REVISED APRIL 2007

Table 3-15. TIMERCTL Description

Bit

Field Name

Description

31:2

RESERVED Reserved. Read-Only, writes have no effect.

Timer0 External Input (TIN0) Select

0 = Timer0 external input comes directly from the TINP0L pin (default).

TINP0SEL

1 = Timer0 external input is TINP0L pin divided by 6. For example, if TINP0L = 25MHz, Timer0 input TIN0 is

25MHz / 6 = 4.2 MHz.

WatchDog Reset Enable

WDRST

0 = WatchDog Timer Event (WDINT from Timer2) does not cause device reset.

1 = WatchDog Timer Event (WDINT from Timer2) causes a device max reset (default).

3.6.2.3 EDMA TC Configuration Register (EDMATCCFG)

The EDMA Transfer Controller Configuration (EDMATCCFG) register configures the default burst size

(DBS) for EDMA TC0, EDMA TC1, and EDMA TC2. For more information on the correct usage of DBS,

see the TMS320C642x Enhanced Direct Memory Access (EDMA) Controller User's Guide (literature

number SPRUEM5). The user should only modify this register once during device initialization and

when the corresponding EDMA TC is not in use.

RESERVED

R-0000 0000 0000 0000

RESERVED

TC2DBS

TC1DBS

TC0DBS

R-0000 0000 00

R/W-10

R/W-01

R/W-00

LEGEND: R = Read; W = Write; -n = value after reset

Figure 3-9. EDMA TC Configuration Register (EDMATCCFG)

Table 3-16. EDMATCCFG Description

Bit

Field

Description

31:6

RESERVED Reserved. Read-Only, writes have no effect.

EDMA TC2 Default Burst Size

00 = 16 byte

01 = 32 byte

10 = 64 byte (default)

5:4

TC2DBS

11= reserved

EDMA TC2 is intended for miscellaneous transfers.

TC2 FIFO size is 128 bytes, regardless of Default Burst Size setting.

EDMA TC1 Default Burst Size

00 = 16 byte

01 = 32 byte (default)

10 = 64 byte

3:2

TC1DBS

11 = reserved

EDMA TC1 is intended for high throughput bulk transfers.

TC1 FIFO size is 256 bytes, regardless of Default Burst Size setting.

EDMA TC0 Default Burst Size

00 = 16 byte (default)

01 = 32 byte

10 = 64 byte

1:0

TC0DBS

11 = reserved

EDMA TC0 is intended for short burst transfers with stringent deadlines (e.g., McBSP, McASP).

TC0 FIFO size is 128 bytes, regardless of Default Burst Size setting.

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Device Configurations

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