6

6090D–DRMSD–12-Feb-07

ATSAM3308B

5.2.1

Host-controlled Operation

There are three main possible ways of communication with a host processor:

• 8-bit parallel MPU type bidirectional interface signals: D7 - D0, CS, WR, RD, A0, IRQ

• Asynchronous serial, MIDI_IN and optionally MIDI_OUT

• Synchronous serial signals: SDIN, SCLK, SYNC, INT

5.2.2

Stand-alone Operation

Possible stand-alone modes are:

• Firmware into external ROM or Flash memory

• Firmware into external EEPROM or DataFlash

• Firmware into external SmartMedia. In this case, the firmware should reside in the

SmartMedia reserved sectors starting at sector # 1.

6.

Pinout

6.1

Pin Description

In the Pin Description table below:

• Identical sharing number indicates multifunction pins.

• Pd indicates a pin with built-in pull-down resistor.

• Pu indicates a pin with built-in pull-up resistor.

Table 6-1.

Pinout by Pin Name

Pin Name

Pin Number

Type

Sharing

Description

GND

9, 22, 30, 41, 56, 70,

75, 87, 97

PWR

–

Digital ground. All of these pins should be returned to a ground plane.

VC18

20, 47, 73, 99

PWR

–

Core power. All of these pins should be returned to nominal 1.8V or to

PWROUT if the built-in power switch is used.

VC33

13, 50, 83

PWR

–

Periphery power. All these pins should be returned to nominal 3.3V.

PWRIN

29

PWR

–

Power switch input; should be returned to nominal 1.8V even if the

power switch is not used.

PWROUT

28

PWR

–

Power switch output; should be connected to all VC18 pins if the power

switch is used

D7 - D0

96, 95, 91, 90, 82,

81, 77, 76

I/O

1

Slave 8-bit interface data. Output if CS and RD are low (read from chip),

input if CS and WR are low (write to chip). Type of data defined by A0

input.

I/O7 - I/O0

96, 95, 91, 90, 82,

81, 77, 76

I/O

1

SmartMedia data or other peripheral data

P0.7 - P0.0

96, 95, 91, 90, 82,

81, 77, 76

I/O

1

General-purpose I/O; can be programmed individually as input or

output.

CLAD3 - 0

96, 95, 91, 90

In

1

Optional bit clocks for digital audio input. Used for sampling rate

conversion for external incoming digital audio such as AES/BEU or

S/Pdif.