LSI53CF92A LSI, LSI53CF92A Datasheet - Page 34

• Manufacturer Part Number: LSI53CF92A
• Manufacturer: LSI

Specifications of LSI53CF92A

• Lead Free Status / RoHS Status: Not Compliant

2.6 SCSI Data Transfer Rates
2.6.1 Asynchronous Operation
2.6.2 Synchronous Operation
2-14
Performance numbers for the FSC are based on SE connection to the
SCSI bus with no external transceivers.
The asynchronous transmission rate varies with cable length and the
CLK period. The FSC can reach sustained transfer rates of 5 Mbytes/s
on short (1 foot) cables using typical devices operating at or near
nominal voltage and temperature. The typical transfer rate on a 6-meter
cable is 4 Mbytes/s using two typical FSCs talking to each other. The
worst case asynchronous transmission rate, over voltage, temperature,
and process variations is 3 Mbytes/s on a maximum length (6 meters),
SE cable and 4 Mbytes/s on a 1-foot cable.
The asynchronous transmission rate is only slightly affected by the CLK
frequency when sending data. The FSC drives the data bus for a
minimum of one CLK period (plus any additional time required to meet
the ANSI required 55 ns setup time) before asserting REQ/ or ACK/. The
CLK frequency does not affect the asynchronous transfer rate when
receiving data. When the Enable Active Negation bit is set,
Configuration 4 (Config 4)
asynchronously at up to 5 Mbytes/s.
The synchronous data transmission period is equal to the CLK input
frequency multiplied by the encoded value in the
Period
attainable across the commercial voltage and temperature range.
The LSI53CF92A can transfer synchronous SCSI data in both initiator
and target modes at transfer rates up to 10 Mbytes/s, using an input
clock frequency of 40 MHz. The SCSI-1 and Fast SCSI-2 minimum
timing requirements are in
Functional Description
Copyright © 1995–2002 by LSI Logic Corporation. All rights reserved.
register. Sustained synchronous transfer rates of 10 Mbytes/s are
bit 2, the LSI53CF92A can transfer data
Table
2.2.
Synchronous Transfer