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2.2 Pin Descriptions
Table 1. Line Side Interface Pins Description
Signal name
Pin #
RX_DATA[0]
25
RX_DATA[1]
26
RX_DATA[2]
27
RX_DATA[3]
28
RX_DATA[4]
29
RX_DATA[5]
32
RX_DATA[6]
33
RX_DATA[7]
34
RX_FRAME_IN
23
RX_LAIS_OUT
153
RX_LOF_OUT
149
RX_LOS
147
RX_OOF_OUT
152
RX_SONETCLK
24
TX_DATA[0]
145
TX_DATA[1]
144
TX_DATA[2]
143
TX_DATA[3]
138
TX_DATA[4]
137
TX_DATA[5]
136
TX_DATA[6]
135
TX_DATA[7]
134
8
Type(I/O)
Signal description
I
RECEIVE DATA: Byte-wide STS-3c data input stream.
RX_DATA [7] is the MSB, and RX_DATA [0] the LSB.
Data is sampled on the rising edge of RX_SONETCLK.
I
RECEIVE FRAME INDICATOR: Frame position indication signal is
active high and indicates the SONET frame position on the RX_
DATA [7:0] bus. Sampled on the rising edge of RX_SONETCLK.
Only used when RX_FRAME_INH is set, otherwise tie this pin low.
O
RECEIVE LINE ALARM INDICATION SIGNAL OUTPUT:
Receive line alarm indication signal will be set high if a binary
"111" pattern is received for the number of consecutive frames
programmed into the K2_CONSEC register. RX_LAIS_OUT will
be cleared if a binary "111" pattern is not received for the
number of consecutive frames programmed into the
K2_CONSEC register.
O
RECEIVE LOSS OF FRAME OUTPUT:
RX_LOF_OUT is set high when there is a loss of frame indication.
If RX_OOF_OUT is active continuously for 24 consecutive frames
(3 ms), the RX_LOF bit is set high. Once RX_LOF is set, it remains
high until RX_OOF_OUT is inactive continuously for 3 ms.
I
RECEIVE LOSS OF SIGNAL: RX_LOS should be used to indicate
to the framer that there is no signal present from the optical
receiver. The signal's default is active high, but can be set to
active low by programming RX_LOS_LEVEL = 1.
O
RECEIVE OUT OF FRAME OUTPUT: RX_OOF_OUT is set high when
there is an out of frame indication. An out of frame condition occurs
when five consecutive erroneous framing patterns specified
in the A1 or A2 bytes have been received.
I
RECEIVE SONET CLOCK: RX_SONETCLK is the receive
input clock from the line side, and provides timing for the
receive data bus and frame position indication inputs.
This clock should be 19.44 MHz 20 ppm.
O
TRANSMIT DATA: Byte-wide STS-3c data output stream.
TX_DATA [7] is the MSB, TX_DATA [0] is the LSB. Data is
updated on the rising edge of TX_SONETCLK.
(continues)
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