NEC UPD98413 User Manual page 189

(19) Transmit FIFO threshold register1 (FTHT1)
The FTHT1 register sets the threshold of the transmit FIFO.
Register
Name
Port0:
FTHT1 0064H
31 30 29 28
Reserved
15 14 13 12
Reserved
Bit Field
D31- Reserved
D24
D23-
PLOW[7:0]
D16
D15-D8 Reserved
D7- D0
APHIGH[7:0]
CHAPTER 5 REGISTERS
Address
Port1: Port2: Port3:
0464H 0864H 0C64H
27 26 25 24
11 10 9 8
Set to 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.
Set to 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.
PRELIMINARY
Access Default
R/W 0010000D
23 22 21 20
PLOW[7:0]
7 6 5 4
APHIGH[7:0]
Function
19 18 17 16
3 2 1 0
Default
0
10 H
0
0D H
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