56 PCIE-5565RC* Ultrahigh Speed Fiber-Optic Reflective Memory with Interrupts
Publication No. 500-9300875565-000 Rev. C.0
Bits 15 through 08:
Reserved
–
These bits are reserved
.
Bit 07: TX FIFO Empty
– A logic high (1) indicates the TX FIFO is currently
empty. This bit provides immediate status only (not latched)
and is read-only.
Bit 06:
TX FIFO Almost Full
– A logic high (1) indicates the TX FIFO is currently
almost full. This bit provides immediate status only (not
latched) and is read-only. Periodic assertion of this bit is
normal.
Bit 05:
Latched RX FIFO Full
– A logic high (1) indicates the RX FIFO has
experienced a full condition at least once. This bit is read-
only within this register. To clear this condition write to the
corresponding bit within the Local Interrupt Status Register.
NOTE
The occurrence of the Latched RX FIFO Full signal is a fault condition due to a board malfunction and
indicates that the received data may have been lost.
Bit 04:
Latched RX FIFO Almost Full
– A logic high (1) indicates the RX FIFO is
operating at the maximum acceptable rate. Under normal
operating conditions, this event should not occur. This bit is
read-only within this register. To clear this condition, write to
the corresponding bit within the Local Interrupt Status
Register.
Bit 03:
Latched Sync Loss
–
A logic high (1) indicates the receiver circuitry has
detected the loss of a valid signal at least once since the last
time the flag has been cleared. Under normal operating
conditions, this event should not occur and may indicate a
loss of data. A logic high may indicate the receiver’s link was
intentionally or unintentionally disconnected.
Bit 02:
RX Signal Detect
– A logic high (1) indicates the board receiver is
currently detecting light. This bit provides immediate status
only (not latched) and is read-only.
Bit 01: Bad Data
– A logic high (1) indicates the board receiver circuit has detected
bad (invalid) data at least once since power up or since the
Offset 1
Offset 0
Offset Applied
0
0
$0
0
1
$4000000
1
0
$8000000
1
1
$C000000
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