Analog Devices 82-0000603-01, ADSP-21535 E-KIT LITE system manual Dsp, System Architecture

4.2System Architecture

The EZ-KIT Lite has been designed to demonstrate the capabilities of the ADSP- 21535 DSP. This section describes the DSP’s configuration on the EZ-KIT Lite board.

JTAG Header

SRAM

544KB Flash

(U4)

4M X 32bit

SDRAM (U5, U6)

USB Connector

FXUSBEZ	PortJTAG	External Bus Interface	SPI 1:0
		Unit
			Timer2:0
			UART1:0

	ADSP-21535			Expansion
20MHz		DSP		Connectors
Oscillator	CLK_IN		SPORT1	(P1, P2, P3)
Crystal		(U1)	USB
32.768KHz
	RTC

Power	VDD_INT
Management
		SPORT0	PF15:0	LEDs, PBs
3.3V	VDD_EXT
				and Clock
				Logic

+7.5V Connector

5V A5V 3.3V

Power

Regulation

AD1885

Codec

(U7)

SPORT0

Connector

Stereo LINEIN/

MIC and

LINEOUT

Connectors

Figure 4-1: System Architecture

The DSP has a default core voltage of 1.5V. Refer to section 3.6.1 for more information about changing the core voltage while the DSP is running. The voltage of the DSP’s peripheral interface is 3.3V.

A 20 MHz oscillator supplies the input clock to the DSP. The speed at which the core and peripherals operate is determined by the configuration of the multiplier select switch (SW2) at reset. (See section 4.3.4.) By default, the DSP core runs at 300 MHz and the peripheral interface runs at 120 MHz. A 32.768 kHz crystal supplies the Real Time Clock (RTC) inputs of the DSP

The EZ-KIT Lite board can be configured to boot in all of the possible ADSP- 21535 boot modes. For information about configuring the boot mode, see section 4.3.3.

ADSP-21535 EZ-KIT Lite Evaluation System Manual 4-2