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參數資料
| 型號： | SAB82C258A-20-N |
| 廠商： | SIEMENS A G |
| 元件分類： | DMA控制器 |
| 英文描述： | Advanced DMA Controller for 16-Bit Microcomputer Sytems (ADMA) |
| 中文描述： | 4 CHANNEL(S), 20 MHz, DMA CONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數： | 1/2頁 |
| 文件大?。?/td> | 26K |
| 代理商： | SAB82C258A-20-N |
Siemens Aktiengesellschaft
Advanced DMA Controller
for 16-Bit Microcomputer Sytems (ADMA)
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).
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
Type
Package
Speed
Muxed
Channel
SAB 82C257-1-N
SAB 82C258A-12-N P-LCC-68-1 (SMD) 12 MHz yes
SAB 82C258A-20-N P-LCC-68-1 (SMD) 20 MHz yes
P-LCC-68-1 (SMD) 10 MHz no
SAB 82C257
SAB 82C258A
1
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