
XRT86SH328
PRELIMINARY
174
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
REV. P1.0.6
BIT[7:4] - Reserved:
BIT 3 - Receive FIFO Overrun
This READ-ONLY bit-field indicates whether or not the DS3 Mapper block is currently declaring a Receive FIFO Overrun
condition.
A Receive FIFO Overrun condition will only occur if DS3 data is output from the DS3 Mapper block to the Receive DS3
Framer block at a much faster rate than that which the Receive DS3 Framer block handles and processes the incoming
DS3 data-stream.
`
0 - Indicates that the DS3 Mapper Block is NOT currently declaring the Receive FIFO Overrun condition.
`
1 - Indicates that the DS3 Mapper Block is currently declaring the Receive FIFO Overrun condition.
BIT 2 - Receive FIFO Underrun
This READ-ONLY bit-field indicates whether or not the DS3 Mapper block is currently declaring the Receive FIFO
Underrun condition.
A Receive FIFO Underrun condition will only occur if DS3 data is output from the DS3 Mapper block to the Receive DS3
Framer block at a much slower rate than that which the Receive DS3 Framer block handles and processes the incoming
DS3 data-stream.
`
0 - Indicates that the DS3 Mapper Block is NOT currently declaring the Receive FIFO Underrun condition.
`
1 - Indicates that the DS3 Mapper Block is currently declaring the Receive FIFO Underrun condition.
BIT 1 - Transmit FIFO Overrun
This READ-ONLY bit-field indicates whether or not the DS3 Mapper block is currently declaring a Transmit FIFO
Overrun condition.
A Transmit FIFO Overrun condition will occur if DS3 data is output from the Transmit DS3 Framer block (towards the
DS3 Mapper Block) at a much faster rate than which the DS3 Mapper block handles and processes the outbound DS3
data-stream.
`
0 - Indicates that the DS3 Mapper Block is NOT currently declaring the Transmit FIFO Overrun condition.
`
1 - Indicates that the DS3 Mapper Block is currently declaring the Transmit FIFO Overrun condition.
BIT 0 - Transmit FIFO Underrun
This READ-ONLY bit-field indicates whether or not the DS3 Mapper block is currently declaring a Transmit FIFO
Underrun condition.
A Transmit FIFO Underrun condition will occur if DS3 data is output from the Transmit DS3 Framer block (towards the
DS3 Mapper Block) at a much slower rate than that which the DS3 Mapper Block handles and processes the outbound
DS3 data-stream.
`
0 - Indicates that the DS3 Mapper Block is NOT currently declaring the Transmit FIFO Underrun condition.
`
1 - Indicates that the DS3 Mapper Block is currently declaring the Transmit FIFO Underrun condition.
T
ABLE
230: DS3 M
APPER
B
LOCK
- R
ECEIVE
S
TATUS
R
EGISTER
- B
YTE
0 (A
DDRESS
L
OCATION
= 0
X
0D07)
BIT7
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Reserved
Receive
FIFO Over-
run
Receive
FIFO Under-
run
Transmit
FIFO Over-
run
Transmit
FIFO Under-
run
R/O
R/O
R/O
R/O
R/O
R/O
R/O
R/O
0
0
0
0
0
0
0
0