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參數(shù)資料
| 型號： | 37C669 |
| 廠商： | SMSC Corporation |
| 英文描述： | DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL |
| 中文描述： | 電腦98/99順從超級I / O軟盤控制器與紅外線支持 |
| 文件頁數(shù)： | 11/164頁 |
| 文件大?。?/td> | 621K |
| 代理商： | 37C669 |
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108
The ECP requests programmed I/O transfers
from the host by activating the PINTR pin. The
programmed I/O will empty or fill the FIFO
using the appropriate direction and mode.
Note: A threshold of 16 is equivalent to a
threshold of 15.
These two cases are treated
the same.
Programmed I/O - Transfers from the FIFO to
the Host
In the reverse direction an interrupt occurs when
serviceIntr is 0 and readIntrThreshold bytes are
available in the FIFO. If at this time the FIFO is
full
it can be emptied completely in a single
burst, otherwise
readIntrThreshold bytes may
be read from the FIFO in a single burst.
readIntrThreshold =
(16-<threshold>) data
bytes in FIFO
An interrupt is generated when serviceIntr is 0
and the number of bytes in the FIFO is greater
than or equal to (16-<threshold>). (If the
threshold = 12, then the interrupt is set
whenever there are 4-16 bytes in the FIFO). The
PINT pin can be used for interrupt-driven
systems. The host must respond to the request
by reading data from the FIFO. This process is
repeated until the last byte is transferred out of
the FIFO. If at this time the FIFO is full, it can
be
completely
emptied
in
a
single
burst,
otherwise a minimum of (16-<threshold>) bytes
may be read from the FIFO in a single burst.
Programmed I/O - Transfers from the Host to
the FIFO
In the forward direction an interrupt occurs when
serviceIntr is 0 and there are writeIntrThreshold
or more bytes free in the FIFO. At this time if
the FIFO is empty it can be filled with a single
burst before the empty bit needs to be re-read.
Otherwise
it
may
be
filled
with
writeIntrThreshold bytes.
writeIntrThreshold =
(16-<threshold>) free
bytes in FIFO
An interrupt is generated when serviceIntr is 0
and the number of bytes in the FIFO is less than
or equal to <threshold>. (If the threshold = 12,
then the interrupt is set whenever there are 12 or
less bytes of data in the FIFO). The PINT pin
can be used for interrupt-driven systems. The
host must respond to the request by writing data
to the FIFO. If at this time the FIFO is empty, it
can be completely filled in a single burst,
otherwise a minimum of (16-<threshold>) bytes
may be written to the FIFO in a single burst.
This process is repeated until the last byte is
transferred into the FIFO.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 37C672 | 制造商:SMSC 制造商全稱:SMSC 功能描述:ENHANCED SUPER I/O CONTROLLER WITH FAST IR |
| 37C67X | 制造商:SMSC 制造商全稱:SMSC 功能描述:ENHANCED SUPER I/O CONTROLLER WITH FAST IR |
| 37C-6BH-5-5 | 制造商:Birtcher Products 功能描述: |
| 37C72U-185 | 制造商:White-Rodgers 功能描述: |
| 37C73U-170 | 制造商:White-Rodgers 功能描述: |
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