參數(shù)資料
型號: SYM53C140
廠商: LSI CORP
元件分類: 其它接口
英文描述: Ultra2 SCSI Bus Expander(Ultra2 SCSI總線擴(kuò)展器)
中文描述: SPECIALTY INTERFACE CIRCUIT, PQFP160
封裝: 32 MM, PLASTIC, QFP-160
文件頁數(shù): 16/68頁
文件大?。?/td> 928K
代理商: SYM53C140
2-2
Functional Descriptions
Figure 2.1
SYM53C140 Block Diagram
In its simplest form, the SYM53C140 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 model of the SYM53C140 is
pieces of wire that allow corresponding SCSI signals to flow from one
side to the other side. The SYM53C140 needs to know which signals are
being driven by another device so it can enable the proper drivers to
pass the signals along. In addition, the SYM53C140 does some signal
retiming to maintain the signal skew budget from the source bus to the
load bus as if the source was a local bus member.
2.1.1 SCSI A Side and B Side Control Blocks
The SCSI A Side pins are connected internally to the corresponding
SCSI B Side pins, forming bidirectional connections to the SCSI bus.
In the LVD/LVD mode, the SCSI A Side and B Side control blocks
connect to both targets and initiators and accept any asynchronous or
synchronous data transfer rates up to the 80 Mbytes/s rate of Wide
Ultra2 SCSI. TolerANT
and LVDlink technologies are part of both the A
Side and B Side control blocks.
Retiming
Logic
Precision
Delay
Control
State
Machine
Control
L
D
R
L
D
R
S
S
L
L
Control
Signals
LVD, Single-ended, HVD
Wide Ultra SCSI Bus
(A Side)
LVD, Single-ended, HVD
Wide Ultra SCSI Bus
(B Side)
A_DIFFSENS
B_DIFFSENS
40 MHz Clock Input
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