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參數(shù)資料
| 型號(hào)： | W89C880F |
| 英文描述： | LAN Hub Controller |
| 中文描述： | 局域網(wǎng)集線(xiàn)器控制器 |
| 文件頁(yè)數(shù)： | 42/72頁(yè) |
| 文件大?。?/td> | 731K |
| 代理商： | W89C880F |
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W89C840F
- 42 -
28:21
R/W
REIT
Receive Early Interrupt Threshold
Duri ng recei vi ng packet,
W89C840F will assert an
i nterrupt
request when the byte
number of the received data, which the
receive DMA has moved them into the data buffer, excesses the
receive early interrupt threshold.
To set this field 00H will disable receive early interrupt function.
The setting of the receive early interrupt is as following.
REIT[28:21] receive early interrupt threshold
---------------- -----------------
01H 4 bytes
02H 8 bytes
-- --
0fH 60 bytes
10H 64 bytes
-- --
ffH 020 bytes
20:14
R/W
TTH
Transmit Threshold.
These bits select the transmit threshold level of the transmit FIFO.
The packets
transm t
start
immediately once the data queued
into the transmit FIFO has reached the threshold level.
The
transm ssi on
i s
also started immediately when the full packet
has been transferred into the transmit FIFO even though the frame
length is less than the TTH level.
To change this bit, the transmit state machine must be in Idle state.
The following table shows there is a difference with 16 bytes for
each consecutive setting value in this field, except that the first one
in the table.
TTH[20:14]
--------------- -----------------
00H full packet
01H 16 bytes
02H 32 bytes
-- --
0fH 240 bytes
10H 256 bytes
-- --
7fH 2032 bytes
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|---|---|
| W89C92 | 制造商:WINBOND 制造商全稱(chēng):Winbond 功能描述:PCMCIA ETHERNET NETWORK TWISTED PAIR INTERFACE CONTROLLER |
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| W89C92P | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:10M CMOS Coaxial Transceiver |
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