Curtiss-Wright FHF5-PC4MWB04-00, Справочник по аппаратуре

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REGISTERS
Copyright 2017 6-10 FibreXtreme Hardware Reference
6.4.7 Receive FIFO Threshold
– Offset 0x14
NOTE : The lower 20 bits of this register, indicating the number of 32-bit words, is
limited to showing a 4 MB value. This count value will decrement and roll over several
times when reading data out of a full 128 MB receive FIFO. i.e. word count will
indicate a decrementing count from 4 MB down to 0. Then will display 4 MB again
until final 4 MB of data is read out of the FIFO.
Field Description Access Reset
Value
19 to 0 Number of 32-bit words in the Receive FIFO. R 0
20 Rearm Threshold Interrupt
– Write ‘1’ to rearm the
threshold register
. Writing ‘0’ has no effect.
W 0
21 Data present
– A ‘1’ indicates data is present on the
output. A ‘0’ indicates no data is present.
R 0
29 to 22 Reserved. None 0
31 to 30 Interrupt Threshold
– Selects one of the following levels
of the Receive FIFO to interrupt on:
00
– Interrupt threshold set to Receive FIFO Not Empty
01
– Interrupt threshold set to Receive FIFO ¼ Full
10
– Interrupt threshold set to Receive FIFO ½ Full
11
– Interrupt threshold set to Receive FIFO ¾ Full
R/W 0
6.4.8 Laser Transmitter Control
– Offset 0x18
Field Description Access Reset
Value
25 to 0 Reserved. None 0
26 Manual laser shutdown
– Set to ‘1’ to shutdown the
laser
. Set to ‘0’ for normal operation.
R/W 0
31 to 27 Reserved. None 0