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參數(shù)資料
| 型號： | LSI53C141 |
| 英文描述： | LSI53C141 SCSI Bus Expander technical manual v2.1 11/00 |
| 中文描述： | LSI53C141 SCSI總線擴展技術(shù)手冊2.1 11/00 |
| 文件頁數(shù)： | 25/166頁 |
| 文件大?。?/td> | 1330K |
| 代理商： | LSI53C141 |
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8032-Based Timer
2-9
2.4 8032-Based Timer
An 8032-based timer is also operated at interrupt level. This makes the
time keeping more accurate than polling, and since the routine is of
minimal size it does not seriously affect performance. Currently this time
keeping is only used to control the periodic scanning of the TWS input
devices, so timing accuracy is not important. However, the time keeping
feature may be used in the future for more time-critical functions.
2.5 TWS Bus
During normal operation, the TWS bus is only used as an input bus. The
TWS bus is also used for booting (or autodownload from flash), and to
update the contents of the flash by using the SCSI bus, but these are not
part of normal operation. The devices currently supported on the TWS
bus are the Dallas 1621 and the National LM75 and LM78. These
devices do not need to be monitored constantly, and some of them (most
notably the LM78) need to be “l(fā)eft alone” for a sufficient period of time
so that they can update all of their collected data. This means that these
parts should be polled periodically. The host/initiator will
probably/realistically poll the SAF-TE software every few minutes, so the
SAF-TE software need only poll the TWS parts every few seconds. The
software can poll the TWS parts continuously or as infrequently as every
8.5 minutes. Typically, the software will be configured to poll every
2 seconds. This interval is specified by the user with the configuration
utility. The user can request that the software poll continuously (that is,
every 0 seconds), but LSI Logic does not recommend this.
The TWS polling routines (mentioned above) collect their data and place
that data in the SCSI/SAF-TE command response packets (just as the
state machine does) so that these packets always contain up-to-date
information for immediate transmission to the host/initiator when it is
requested.
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