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參數(shù)資料
| 型號： | RTL8019AS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Realtek Full-Duplex Ethernet Controller with Plug and Play Function (RealPNP) |
| 中文描述： | 瑞昱全雙工以太網(wǎng)控制器即插即用功能（RealPNP） |
| 文件頁數(shù)： | 33/50頁 |
| 文件大?。?/td> | 992K |
| 代理商： | RTL8019AS |
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8019AS.doc
2001-05-10
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SPECIFICATION
RTL8019AS
33
There are two other special considerations for the software protocol. During an iteration, it is
possible that the 55H and AAH combination is never detected. It is also possible that the checksum
does not match. If either of these cases occur on the first iteration, it must be assumed that the
READ_DATA port is in conflict. If a conflict is detected, then the READ_DATA port is relocated.
The above process is repeated until a non-conflicting location for the READ_DATA port is found.
The entire range between 200H and 3FFH is available, however in practice it is expected that only
a few locations will be tried before software determines that no Plug and Play cards are present.
During subsequent iterations, the occurrence of either of these two special cases should be
interpreted as the absence of any further Plug and Play cards (i.e. the last card was found in the
previous iteration). This terminates the isolation protocol.
NOTE: The software must delay 1 msec prior to starting the first pair of isolation reads, and
must wait 250 msec between each subsequent pair of isolation reads. This delay gives the
ISA card time to access information from possibly very slow storage devices.
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