CHAPTER 5 REGISTERS
PRELIMINARY
NEC confidential and Proprietary
189
(19) Transmit FIFO threshold register1 (FTHT1)
The FTHT1 register sets the threshold of the transmit FIFO.
Address
Register
Name
Port0: Port1: Port2: Port3:
Access Default
FTHT1 0064H
0464H
0864H
0C64H
R/W
0010000D
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved
PLOW[7:0]
15
14
13
12
11
10 9 8 7 6 5 4 3 2 1 0
Reserved
APHIGH[7:0]
Bit Field
Function
Default
D31-
D24
Reserved
Set to 0.
0
D23-
D16
PLOW[7:0]
Sets the low threshold which the TPA signal is asserted when the number of
words (32-bit width) for the transmit FIFO space is higher than this field.
10 H
D15-D8
Reserved
Set to 0.
0
D7-D0
APHIGH[7:0]
ATM mode:
Sets the high threshold which the TCLAV signal is deasserted when the number
of words (32-bit width) for the transmit FIFO space is lower than this field.
POS mode:
Sets the high threshold which the TPA signal is deasserted when the number of
words (32-bit width) for the transmit FIFO space is lower than this field.
0D H
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