Cypress AN2131QC 제품 설명서 - 페이지 10

{카테고리_이름} Cypress AN2131QC에 대한 제품 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Cypress AN2131QC 16 페이지. Ez-usb series 2100 usb controller

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Flexible for Many Applications

The EZ-USB architecture

includes features that give

the designer many options

for creating an efficient and

effective design that is

tailored to the needs of an

application.

Loading 8051 Firmware from the Host

EZ-USB Series 2100

Options for Loading

8051 Firmware

The EZ-USB family provides

the peripheral developer with

four options for loading its

8051 firmware.

Software file from the

host system

Loading from a software file

provides the maximum flex-

ibility to the peripheral manu-

facturer. This configuration

takes advantage of the internal

4K or 8K RAM to load 8051 code

and data from the host system.

Because of the ReNumeration

capability of EZ-USB chips, a

new set of descriptors can be

loaded after the initial enumera-

tion without physically discon-

necting the device. This allows

device descriptors and 8051

program code to be loaded from

a driver disk. Only the vendor

ID, product ID, and device ID

need to be loaded during boot

time in hardware through a 16-

byte EEPROM. Using this

configuration, users can implement

a USB function in a tiny 44 PQFP

package yielding a complete USB

solution in less than one square

inch of PC board space.

EEPROM loaded through the

C port

The EZ-USB architecture supports

an external EEPROM load

through the I

C bus. This gives

designers the capability to load

8051 program code from hard-

ware. Because of the flexibility of

the external EEPROM and inter-

nal RAM, manufacturers have the

option to make last-minute

changes to a design/code without

impacting production schedules.

External memory through the

memory expansion port

External memory may be added to

EZ-USB family members in the

80-pin PQFP package. This

memory is available through a

memory expansion port. Separate

16-bit address and 8-bit data

busses are also available to

directly attach to a 64K EPROM,

SRAM, or Flash memory. Unlike a

standard 8051, the address and

memory ports are not multi-

plexed, eliminating the need for

glue logic for connection to

external memory.

Internal ROM for peripheral

manufacturers who migrate to the

ROM-based EZ-USB chip

EZ-USB ROM options are soft-

ware and pin compatible to RAM

members of the family. Therefore,

high-volume customers can move

easily to ROM when their 8051

firmware code is solidified.