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參數(shù)資料
| 型號： | AIC-33C94 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Enhanced SCSI Bus Controller |
| 中文描述： | 增強型SCSI總線控制器 |
| 文件頁數(shù)： | 1/2頁 |
| 文件大小： | 107K |
| 代理商： | AIC-33C94 |
Overview
The Adaptec
AIC-33C94 Enhanced
SCSI Bus Controller (ESBC) is ideal
for the needs of today’s peripheral
systems. SCSI command automation
coupled with custom programmability
provides a flexible solution for OEM
designers. These features, integrated
into a system with Adaptec host
systems, deliver end-to-end compati-
bility and leading-edge performance.
Key Benefits
Fast, efficient data transfer
The AIC-33C94 ESBC controls data
transfers between the 8-bit SCSI bus
and the local data buffer. A split-
bus architecture provides separate
CPU and DMA buses that enable
concurrent operations for optimum
performance. The CPU bus is a
dedicated 8-bit microprocessor
interface. The 16-bit DMA bus is
programmable to handle either
8-bit or 16-bit transfers, delivering
a maximum data transfer rate of
10 MBps in 8-bit mode or 20 MBps
in 16-bit mode. The total time
required to perform arbitration,
selection, command transfer,
and message transfer is less than
20 microseconds.
A 32-byte on-chip RAM buffer
enables the storage of command,
message, and status bytes, reducing
code development and ensuring more
efficient operation by reducing the
burden on the CPU. A pipelined
24-bit transfer counter, specifiable
in bytes or blocks, enables larger
data transfers to be performed with
a single command.
Programmng flexibility
The AIC-33C94 controllers can han-
dle SCSI protocol and data transfer
through a 128-word Writable Control
Store (WCS), which allows develop-
ers to program any sequence of
SCSI bus phases. The AIC-33C94
controller can act as a target as
well as an initiator.
Simplified development
An advantage of the AIC-33C94
controller is ease of development. An
evaluation kit is available that helps
speed time to market. It includes an
evaluation board with sample WCS,
SCSI, and SCAM Level 1 and Level 2
codes that can be quickly customized.
Easy-to-follow flow charts and appli-
cation notes provide step-by-step
programming guidance.Either target
or initiator mode can be emulated
for evaluation and debugging.
Power management
For implementations where power
consumption is an issue, the
AIC-33C94 controller features an
automatic sleep mode.If the con-
troller is idle for a specified period
of time, it powers down. It goes
back into operation within 200
nanoseconds. This feature is bene-
ficial for portable-based applications.
AIC
Enhanced SCSI Bus Controller
-33C94
Product Highlights
n
Synchronous SCSI data transfer
rate up to 10 MBps
n
Programmable 128-word
Writable Control Store for
handling SCSI protocol and
data transfer
n
Support for SCSIConfigured
automatically (SCAM) protocol
with low-level SCSI bus control
n
Split-bus architecture with
dedicated 8-bit mcroprocessor
interface and integrated DMA
controller, programmable to
be bus master or slave
n
32-word by 9-bit dual port
registers to store commands,
messages, and status
R
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