8101 Datasheet, PDF (116/172 Pages) LSI Computer Systems – Gigabit Ethernet Controller

RWM2[7:0]
Receive FIFO Increment = 16 Words (64 Bytes)
Watermark 2 Threshold
[7:0], R/W
RWM2[7:0]
Range
11111111
11111110
11111110
Description
0−4096 words (0−16386 bytes)
Reserved, do not use
4080 words in FIFO (16320 bytes)
4064 words in FIFO (16256 bytes)
00000001
00000000
4.3.16 Register 19–Flow Control 1
32 words in FIFO (128 bytes)
16 words in FIFO (64 bytes)
15
MCNTRL
14
13
MCPASS[1:0]
12
MCFLTR
11
MCENDPS
10
7
MCASND[3:0]
6
0
RES = 0
Note: MCNTRL 15-bit occurs on REGD15 pin
MCNTRL
MAC Control Frame Enable
15, R/W
MCNTRL
Description
1
Valid receive MAC control frames cause the
transmitter to pause (flow control enabled)
0
Transmitter not paused (flow control disable)
MCPASS[1:0]
MAC Control Frame Pass Through
Enable
[14:13], R/W
MCPASS[1:0] Description
11
Valid MAC control frame that have pause
opcode are passed through to receive FIFO
10
Valid MAC control frames that have any opcode
are passed through to receive FIFO
01
Valid MAC control frames that have nonpause
opcode are passed through to receive FIFO
00
MAC control frames are not passed through to
receive FIFO
4-28
Registers
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