8101 Datasheet, PDF (114/172 Pages) LSI Computer Systems – Gigabit Ethernet Controller

4.3.14 Register 17–Transmit FIFO Threshold
15
11
TWM1[4:0]
10
6
TWM2[4:0]
5
0
TASND[5:0]
Note: TWM1[4] 15-bit occurs on the REGD15 pin
TWM1[4:0]
Transmit FIFO Watermark 1 Threshold [15:11], R/W
TWM1[4:0]
Range
Increment
11111
11110
11101
Description
0−1024 words (0−4096 bytes)
32 words (128 bytes)
Reserved, do not use
992 words in FIFO (3968 bytes)
960 words in FIFO (3840 bytes
TWM2[4:0]
00001
00000
64 words in FIFO (256 bytes)
32 words in FIFO (128 bytes)
Transmit FIFO Watermark 2 Threshold [10:6], R/W
TWM2[4:0]
Range
Increment
11111
11110
11101
Description
0−1024 words (0−4096 bytes)
32 words (128 bytes)
Reserved, do not use
992 words in FIFO (3968 bytes)
960 words in FIFO (3840 bytes)
00001
00000
64 words in FIFO (256 bytes)
32 words in FIFO (128 bytes)
4-26
Registers
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