S3045
SONET/SDH OC-12 TO OC-48 MUX/DEMUX
Table 5. Receiver Output Pin Assignment and Descriptions (Continued)
Pin Name
Level
I/O
Pin #
Description
PULSEOOF
LVTTL
O
186
Pulse Out of Frame. Active high. The Out of Frame (OOF) signal
will pulse for a minimum of 7.5ns when the S3045 is out of frame
and when the A1A2 boundary is not received for 250µs. The
PULSEOOF is inactive when the S3045 is in frame. An OOF
declaration occurs when four consecutive errored framing patterns
are received. OOF is used to enable upstream framing pattern
detector to search for the framing pattern. Figure 13 depicts the
functional timing of this signal.
J0FP
LVTTL
LVTTL
O
O
206
183
J0 Frame Pulse. Active high. Active when the J0 byte is presented
on the POUTA[7:0] data bus.
B1ERR
B1 Parity Error. Active high. Indicates that a B1 bit error has been
detected when high. For each frame B1ERR will pulse a maximum
of 8 times. In between pulses (bit errors) the B1ERR will be low for
a minimum of 2 POCLK cycles. This may be turned off by setting
the B1SELB inactive.
PAROUTA
PAROUTB
PAROUTC
PAROUTD
LVTTL
LVTTL
O
O
158
144
96
Parity Output. Odd or even parity depending on the input of parity
select (PARSEL) for the 8 bit POUT[7:0] A, B, C, D and FP A, B, C,
D (optional) data bus. PAROUT A, B, C, D, (FP A, B, C, D optional)
is updated on the falling edge of POCLK.
68
LOS
184
Loss of Signal. Active high. When active, LOS indicates that a
consecutive zero pattern for a minimum of 27usec of all zeros is
detected on the incoming scrambled STS-48/STM-16 signal before
descrambling. LOS is deactivated when two valid framing words are
detected and no LOS is detected in between. LOS is updated on
the falling edge of POCLK.
Table 6. Common Pin Assignment and Descriptions
Pin Name
B1SELB
Level
I/O
Pin #
Description
LVTTL
I
203
B1 Parity Byte Select. Active low. When active, B1 calculation and
insertion in both the transmitter and receiver sections is enabled.
When inactive, the B1 calculation and insertion in both the
transmitter and receiver sections is disabled. This signal is static
and must not be changed in normal operation.
PARSEL
RSTB
LVTTL
LVTTL
I
I
197
193
Parity Select. When high selects even parity. When low selects
odd parity. This signal is static and must not be changed in normal
operation.
Reset. Active low. Asyncronous reset input for the device. During
reset PCLK A, B, C, D does not toggle and frame synchronization
with SYNCRST will be activated.
16
December 13, 1999 / Revision E
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
