ADDR21 datasheet(22/68 Pages) ETC2

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NS 75 20 mo dul es

NS 75 20 Da ta shee t

03 /2 00 6

NS7520 modules

CPU module

The CPU uses an ARM7TDMI core processor. The ARM architecture is based on Reduced Instruction

Set Computer (RISC) principles, which result in high instruction throughput and impressive real-

time interrupt response for a small, cost-effective circuit. For more information about ARM7TDMI,

see the ARM7TDMI Data Sheet from ARM Ltd. (www.arm.com).

GEN module

The GEN module provides the NS7520 with its main system control functions, as well as these

features:

Two programmable timers with interrupt

One programmable bus-error timer

One programmable watchdog timer

Two 8-bit programmable general-purpose I/O ports

System (SYS) module

The system module provides the system clock (SYS_CLK) and system reset (SYS_RESET) resources.

The system control signals determine the basic operation of the chip:

Signal mnemonic

Signal name

Description

{XTALA1, XTALA2}

Clock source

Operate in one of two ways:

The signals are affixed with a 10-20 MHz parallel mode

quartz crystal or crystal oscillator and the appropriate

components per the component manufacturer.

XTALA1 is driven with a clock signal and XTALA2 is

left open.

{PLLVDD, PLLVSS}

PLL power

Provide an isolated power supply for the PLL.

RESET_

Chip reset

Active low signal asserted to initiate a hardware reset of the

chip.

{TDI, TDO, TNS,

TRST_, TCK}

JTAG interface

Provide a JTAG interface for the chip. This interface is used

for both boundary scan and ICE control of the internal

processor.

{PLLTEST_, BISTEN_,

SCANEN_}

Chip mode

Encoded to determine the chip mode.

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