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A8237 Datasheet(PDF) 1 Page - Altera Corporation

Part No. A8237
Description  PROGRAMMABLE DMA CONTROLLER
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Maker  ALTERA [Altera Corporation]
Homepage  http://www.altera.com
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®
Altera Corporation
5
a8237
Programmable
DMA Controller
April 1999, ver. 1.01
Data Sheet
A-DS-A8237-01.01
Features
s
a8237
MegaCore function implementing a programmable direct
memory access (DMA) controller
s
Optimized for FLEX® architecture
s
Provides four independent channels
s
Offers static read/write or handshaking modes
s
Includes direct bit set/reset capability
s
Uses approximately 1,201 FLEX logic elements (LEs)
s
Functionally based on the Intel 8237A and Harris 82C37A devices,
except as noted in “Variations & Clarifications” on page 24
General
Description
The a8237 MegaCore 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.
Figure 1. a8237 Symbol
clk
hlda
ncs
neopin
niorin
niowin
ready
reset
ain[3..0]
dbin[7..0]
dreq[3..0]
adstb
aen
dben
dmaenable
hrq
neopout
niorout
niowout
nmemr
nmemw
aout[7..0]
dack[3..0]
dbout[7..0]
A8237




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