SONET/SDH/ATM OC-12 TRANSMITTER AND RECEIVER
S3017/S3018
S3018 Pin Assignment and Descriptions (Continued)
Pin Name
Level I/O
Pin # Description
REFSEL
TTL
I
7
Reference select used to select the reference clock frequency.
Set low to select 77.76 MHz. Set high to select 19.44 MHz for
applications less demanding than SONET/SDH.
CAP1
CAP2
–
I
1
52
The loop filter capacitor is connected to these pins. The
capacitor value should be 0.1µf ±10% tolerance, X7'R dielectric.
50V is recommended (16V is acceptable).
POUT7
POUT6
POUT5
POUT4
POUT3
POUT2
POUT1
POUT0
TTL
TTL
O
O
30
29
23
22
20
19
16
12
Parallel data bus, a 77.76 Mbyte/sec word, aligned to the
POCLK parallel output clock. POUT7 is the most significant bit
(corresponding to bit 1 of each PCM word, the first bit received).
POUT0 is the least significant bit (corresponding to bit 8 of each
PCM word, the last bit received). POUT(7-0) is updated on the
falling edge of POCLK.
FP
11
Frame pulse. Indicates frame boundaries in the incoming data
stream (SERDATI). If framing pattern detection is enabled, as
controlled by the OOF input, FP pulses high for one POCLK
cycle when a 48-bit sequence matching the framing pattern is
detected on the serial data inputs. When framing pattern
detection is disabled, FP pulses high when the incoming data
stream, after byte alignment, matches the framing pattern. FP is
updated on the falling edge of POCLK.
POCLK
TTL
TTL
O
O
9
Parallel output clock, a 77.76 MHz nominally 50% duty cycle,
byte rate output clock, that is aligned to POUT(7-0) byte serial
output data. POUT(7-0) and FP are updated on the falling edge
of POCLK.
LOCKDET
35
Clock recovery indicator. Set high when the internal clock
recovery has locked onto the incoming data stream. LOCKDET
is an asynchronous output.
AVEE
0V
+5V
+5V
0V
–
2, 39, 41, Analog 0V
43
AVCC
–
–
–
3, 38, 40, Analog +5V
47
ECLVCC
ECLVEE
5, 15, 25, Digital +5V
28, 37, 50
6, 10, 18, Digital 0V
21, 32, 36
TTLGND
TTLVCC
NC
0V
+5V
–
–
–
–
13, 17, 27 Digital 0V
14, 24, 26 Digital +5V
51
No Connection
11
December 10, 1999 / Revision B
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
