SAB82C257 datasheet, PDF - EEWORLD Datasheet

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SAB82C257: DescriptionAdvanced DMA Controller for 16-Bit Microcomputer Sytems (ADMA); File Size14KB，2 Pages; ManufacturerSIEMENS; Websitehttp://www.infineon.com/

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SAB82C257 Overview

Advanced DMA Controller for 16-Bit Microcomputer Sytems (ADMA)

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Advanced DMA Controller

for 16-Bit Microcomputer Sytems (ADMA)

SAB 82C257

SAB 82C258A

General Description

The SAB 82258A is an advanced general-purpose four-

channel DMA controller tailored for efficient high speed data

transfer between peripheral devices and memories. It is

either coupled tightly with a companion CPU (local mode) or

working in stand alone applications using the remote mode.

The SAB 82258A is unique among DMA controllers providing

complete direct interfacing to the SAB 80286 as well as to

SAB 80186/188/86/88 bus.

Its four superfast DMA channels transfer rate up to 10 Mbytes

per second are possible. If the maximum transfer rate

reaches as much as 20 Mbyte/second. In addition one of the

DMA channels may be configured as multiplexer channel so

that a large number of low speed peripherals can share the

use of the same channel. The interrupt structure belongs to

the fastest and most versatile ones available. Multiple

SAB 82258A DMAs can be integrated very easily by using a

simple local bus arbiter logic.

The SAB 82258A is the only DMA controller that provides

source or destination-oriented data chaining (two chaining

modes) as well as conditional command chaining (jumps

within channel program based on several conditions).

Type

SAB 82C257-1-N

Package

Speed Muxed

Channel

P-LCC-68-1 (SMD) 10 MHz no

SAB 82C258A-12-N P-LCC-68-1 (SMD) 12 MHz yes

SAB 82C258A-20-N P-LCC-68-1 (SMD) 20 MHz yes

Features

• 16-bit DMA controller for

16-bit family processors

– SAB 80286

– SAB 80186 188

– SAB 8086/88

• 4 independent high-speed DMA channels

• 16 Mbyte addressing range

• 16 Mbyte maximum block length

• Memory based communication with CPU

• “On-the fly” compare, translate and verify operations

• Transfer rates up to 10 Mbyte/s

• 32-bit-fly-by transfers with

up to 20 Mbyte/s (10-MHz system)

• Single cycle and two cycle transfer

• Automatic chaining of command blocks

• Variable chaining of data blocks

• Multiplexer mode operation with up to 32 subchannels

• Local and remote (standalone) mode

• Support of 16-bit and 8-bit data buses

• Multiple programmable control of channel priorities

• Direct and fast CPU/channel communication

Siemens Aktiengesellschaft

SAB82C257 Related Products

	SAB82C257	SAB82C257-1-N	SAB82C258A-20-N	SAB82C258A	SAB82C258A-12-N
Description	Advanced DMA Controller for 16-Bit Microcomputer Sytems (ADMA)	Advanced DMA Controller for 16-Bit Microcomputer Sytems (ADMA)	Advanced DMA Controller for 16-Bit Microcomputer Sytems (ADMA)	Advanced DMA Controller for 16-Bit Microcomputer Sytems (ADMA)	Advanced DMA Controller for 16-Bit Microcomputer Sytems (ADMA)
Maker	-	SIEMENS	SIEMENS	-	SIEMENS
Reach Compliance Code	-	unknow	unknow	-	unknow
Address bus width	-	24	24	-	24
Bus compatibility	-	8086; 8088; 80186; 80188; 80286	8086; 8088; 80186; 80188; 80286	-	8086; 8088; 80186; 80188; 80286
maximum clock frequency	-	10 MHz	20 MHz	-	12 MHz
External data bus width	-	16	16	-	16
JESD-30 code	-	S-PQCC-J68	S-PQCC-J68	-	S-PQCC-J68
Number of DMA channels	-	4	4	-	4
Number of terminals	-	68	68	-	68
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	-	PLASTIC/EPOXY
Package shape	-	SQUARE	SQUARE	-	SQUARE
Package form	-	CHIP CARRIER	CHIP CARRIER	-	CHIP CARRIER
Certification status	-	Not Qualified	Not Qualified	-	Not Qualified
Nominal supply voltage	-	5 V	5 V	-	5 V
surface mount	-	YES	YES	-	YES
technology	-	CMOS	CMOS	-	CMOS
Terminal form	-	J BEND	J BEND	-	J BEND
Terminal location	-	QUAD	QUAD	-	QUAD
uPs/uCs/peripheral integrated circuit type	-	DMA CONTROLLER	DMA CONTROLLER	-	DMA CONTROLLER

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