UCD3138064RMHT datasheet(20/91 Pages) TI1

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UCD3138064

SLUSB72B – MARCH 2013 – REVISED SEPTEMBER 2014

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Detailed Description

6.1

Overview

6.1.1

ARM Processor

The ARM7TDMI-S processor is a synthesizable member of the ARM family of general purpose 32-bit

microprocessors. The ARM architecture is based on RISC (Reduced Instruction Set Computer) principles

where two instruction sets are available. The 32-bit ARM instruction set and the 16-bit Thumb instruction

set. The Thumb instructions allow for higher code density equivalent to a 16-bit microprocessor, with the

performance of the 32-bit microprocessor.

The three-staged pipelined ARM processor has fetch, decode and execute stage architecture. Major

blocks in the ARM processor include a 32-bit ALU, 32 x 8 multiplier, and a barrel shifter.

6.1.2

Memory

The UCD3138x (ARM7TDMI-S) is a Von-Neumann architecture, where a single bus provides access to all

of the memory modules. All of the memory module addresses are sequentially aligned along the same

address range.

This applies to program flash, data flash, ROM and all other peripherals. Within the UCD3138 family

architecture, there is a 1024x32-bit Boot ROM that contains the initial firmware startup routines for

PMBUS communication and non-volatile (FLASH) memory download. This boot ROM is executed after

power-up-reset checks if there is a valid FLASH program written. If a valid program is present, the ROM

code branches to the main FLASH-program execution. If there is no valid program, the device waits for a

program download through the PMBus.

The UCD3138 family also supports customization of the boot program by allowing an alternative boot

routine to be executed from program FLASH. This feature enables assignment of a unique address to

each device; therefore, enabling firmware reprogramming even when several devices are connected on

the same communication bus.

There are three separate flash memory areas present inside the device. There are 2-32 kB program flash

blocks and 1-2 kB data flash area. The 32 kB program areas are organized as 8 k x 32 bit memory blocks

and are intended to be for the firmware programs. The blocks are configured with page erase capability for

erasing blocks as small as 1 kB per page, or with a mass erase for erasing the entire 32 kB array. The

flash endurance is specified at 1000 erase/write cycles and the data retention is good for 100 years. The 2

kB data flash array is organized as a 512 x 32 bit memory (32 byte page size). The data flash is intended

for firmware data value storage and data logging. Thus, the Data flash is specified as a high endurance

memory of 20 k cycles with embedded error correction code (ECC).

For run time data storage and scratchpad memory, a 8 kB RAM is available. The RAM is organized as a 2

k x 32 bit array. The availability of 64 kB of program Flash memory in 2-32 kB banks, enables designers to

implement multiple images of firmware (e.g. one main image + one back-up image) in the device and the

flexibility to execute from either of the banks using appropriate algorithms. It also creates the unique

opportunity for the processor to load a new program and subsequently execute that program without

interrupting power delivery. This feature allows the end user to add new features to the power supply while

eliminating any down-time required to load the new program.

Detailed Description

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