W89C841F Datasheet, PDF (57/102 Pages) Winbond – 3-IN - 1 10/100M FAST ETHERNET CONTROLLER

W89C841F/D
C1c/CNCR Network Configuration Register, continued
BIT
28:21
20:14
13
ATTRIBUTE
R/W
R/W
R/W
BIT NAME
REIT
TTH
TXON
DESCRIPTION
Receive Early Interrupt Threshold
During receiving packet, the W89C841F will assert an
interrupt request when the bytes number of the received
data, which the receive DMA has moved them into the data
buffer, excesses receive early interrupt threshold. To set
this field 00H will disable receive early interrupt function.
The setting of receive early interrupt threshold is as
following.
01h 4 bytes
02h 8 bytes
-- --
0fh 60 bytes
10h 64 bytes
-- --
FFh 1020 bytes
Transmit Threshold
These bits select the transmit threshold level of the transmit
FIFO. The packet Transmission will be started immediately
once the data queued into the transmit FIFO has reached
the threshold level. The transmission will also be 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.
00h full packet
01h 16 bytes
02h 32 bytes
-- --
0Fh 240 bytes
10h 256 bytes
-- --
7Fh 2032 bytes
Transmit On
When set, the transmission process will be started. When
reset, the transmission state machine will be stopped after
the current frame is completed
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Publication Release Date: October 18, 2001
Revision A3