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The DSP has general-purpose and dedicated registers in each of its functional blocks, страница 9

The register is controlled by an Adjust bit. When the Adjust bit is zero, default values for the settings in that segment are used by the PLL. These default values are also returned upon a register read. The default values are subject to change.

Writing this register to 0 resets the register to its factory defaults.

Fout =6*Fin = 98.304 MHz

6*Fin = 147.456 MHz

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

G e nera l Purpose I/O (G PIO ) C ontrol Re g iste rs

Eight pins support general-purpose I/O to registers that control them.

Table B-7 lists the Peripheral Device Control Register Space for GPIO Control registers:

Table B-7. GPIO Control Registers

Register

Name

Description

PCI Address

USB Address

DSP

I/O

Page

DSP

I/O

Address

GPIOCFG

GPIO Configuration

Direction Control (1 = input, 0 = output)

0x010

0x0010

0x00

0x10

GPIOPOL

GPIO Polarity Inputs: 0 = active high 1 = active low. Outputs:

0  = CMOS

1  = Open Drain

0x012

0x0012

0x12

GPIOSTKY

GPIO Sticky:

1 = sticky, 0 = not sticky

0x014

0x0014

0x00

0x14

GPIOWCTL

GPIO Wake Control

1 = wake-up enabled

(requires sticky set)

0x016

0x0016

0x00

0x16

GPIOSTAT

GPIO Status

Read = Pin state Write: 0 = clear sticky status, 1 = no effect

0x018

0x0018

0x00

0x18

GPIOCTL

GPIO Control (w), Init (r) Read = Power-on state; Write: Set state of output pins

0x01A

0x001A

0x00

0x1A

Table B-7. GPIO Control Registers (Continued)

Register

Name

Description

PCI Address

USB Address

DSP

I/O

Page

DSP

I/O

Address

GPIOPUP

GPIO Pullup

Pull-up enable (if input): 1 = enable, 0 = Hi-Z

0x01C

0x001C

0x00

0x1C

GPIOPDN

GPIO Pulldown Pull-down enable (if

input): 1 = enable, 0 =

Hi-Z

0x01E

0x001E

0x00

0x1E

G PIO C onfig ura tion (G PIO C FG ) Re g iste r ! This register resets to 0x7F.

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

G PIO Pola rity (G PIO PO L) Re g iste r ! This register resets to 0xFF.

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

G PIO Stic k y (G PIO STKY ) Re g iste r ! This register resets to zero.

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