Datasheet > A8237

A8237

更新时间： 2024-11-30 22:26:51

品牌	Logo	应用领域
阿尔特拉 - ALTERA		控制器
页数	文件大小	规格书
22页	254K
描述
PROGRAMMABLE DMA CONTROLLER

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A8237 数据手册

a8237

Programmable

DMA Controller

April 1999, ver. 1.01

Data Sheet

■ a8237MegaCore function implementing a programmable direct

Features

memory access (DMA) controller

■

Optimized for FLEX^®architecture

Provides four independent channels

Offers static read/write or handshaking modes

Includes direct bit set/reset capability

Uses approximately 1,201 FLEX logic elements (LEs)

Functionally based on the Intel 8237A and Harris 82C37A devices,

except as noted in “Variations & Clarifications” on page 24

The a8237MegaCore function implements a programmable DMA

controller, which controls memory-to-peripheral and memory-to-

memory data transfers and provides block memory initialization

capability. Four independently programmable channels are available in

the a8237, and DMA requests can be made via hardware or software.

Figure 1 shows the symbol for the a8237.

General

Description

Figure 1. a8237 Symbol

A8237

adstb

aen

dben

clk

hlda

dmaenable

hrq

ncs

neopin

niorin

niowin

ready

reset

neopout

niorout

niowout

nmemr

nmemw

aout[7..0]

dack[3..0]

dbout[7..0]

ain[3..0]

dbin[7..0]

dreq[3..0]

Altera Corporation

A-DS-A8237-01.01

12 3 4 5 6 7...22

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