參數(shù)資料
型號: SYM53C141
廠商: LSI CORP
元件分類: 微控制器/微處理器
英文描述: SCSI Bus Expander(SCSI總線擴展器)
中文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PQFP128
封裝: PLASTIC, QFP-128
文件頁數(shù): 20/68頁
文件大?。?/td> 630K
代理商: SYM53C141
2-2
Functional Description
Figure 2.1
SYM53C141 Block Diagram
In its simplest form, the SYM53C141 passes data and parity from a
source bus to a load bus. The side asserting, deasserting or releasing
the SCSI signals is the source side. The simplest model is that the
SYM53C141 is just pieces of wire that allow corresponding SCSI signals
to flow from side to side. In reality, the SYM53C141 needs to know which
side is driving the signals so it can enable the proper drivers to pass the
signals along. In addition, the SYM53C141 does some signal retiming to
maintain the signal skew budget from source bus to load bus as if the
source was a local bus member.
2.1 SCSI A-Side and B-Side Single-Ended Control Blocks
In the SE to SE mode, the SCSI A-side pins are connected internally to
the corresponding SCSI B-side pins, forming bidirectional connections to
the SCSI bus.
The SCSI A-side and B-side SE control blocks connect to both targets
and initiators and accept any asynchronous or synchronous data transfer
T
S
Retiming Circuit
S
L
Precision
Delay
Control
State
Machine
Control
C
C
A-Side
B-Side
SE Only
Wide Ultra SCSI Bus
Data and Control
LVD and SE
Wide Ultra SCSI Bus
Data and Control
LVD DIFFSENS
Receiver
40 MHz Clock Input
Chip Boundary
Control
Signals
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