
DS21Q50 
Page 3 of 99 
10. 
DS0 MONITORING FUNCTION........................................................................47 
11. 
PRBS GENERATION & DETECTION...............................................................51 
12. 
SYSTEM CLOCK INTERFACE...........................................................................52 
13. 
TRANSMIT CLOCK SOURCE............................................................................55 
14. 
IDLE CODE INSERTION ....................................................................................56 
15. 
PER-CHANNEL LOOP BACK.............................................................................57 
16. 
ELASTIC STORE OPERATION..........................................................................58 
17. 
ADDITIONAL (SA) AND INTERNATIONAL (SI) BIT OPERATION............58 
18. 
USER CONFIGURABLE OUTPUTS...................................................................63 
19. 
LINE INTERFACE UNIT.....................................................................................66 
19.1 R
ECEIVE 
C
LOCK 
A
ND 
D
ATA 
R
ECOVERY
..................................................................67 
19.1.1 Termination....................................................................................................68 
19.2 T
RANSMIT 
W
AVESHAPING 
A
ND 
L
INE 
D
RIVING
.......................................................68 
19.3 J
ITTER 
A
TTENUATORS
............................................................................................72 
19.3.1 Clock And Data Jitter Attenuators................................................................72 
19.3.2 Undedicated Clock Jitter Attenuator............................................................72 
20. 
CMI (CODE MARK INVERSION).....................................................................74 
21. 
INTERLEAVED PCM BUS OPERATION..........................................................76 
22. 
FUNCTIONAL TIMING DIAGRAMS................................................................79 
22.1 R
ECEIVE
.................................................................................................................79 
22.2 T
RANSMIT
.............................................................................................................81 
23. 
OPERATING PARAMETERS.............................................................................85 
24. 
AC TIMING PARAMETERS AND DIAGRAMS..............................................86 
24.1 M
ULTIPLEXED 
B
US 
AC C
HARACTERISTICS
............................................................86 
24.2 N
ON
-M
ULTIPLEXED 
B
US 
AC C
HARACTERISTICS
...................................................89 
24.3 S
ERIAL 
P
ORT
..........................................................................................................92 
24.4 R
ECEIVE 
AC C
HARACTERISTICS
.............................................................................93 
24.5 T
RANSMIT 
AC C
HARACTERISTICS
.........................................................................96 
24.6 S
PECIAL 
M
ODES 
AC C
HARACTERISTICS
................................................................98 
25. 
MECHANICAL DESCRIPTION – 100 PIN LQFP.............................................99 
26. 
MECHANICAL DESCRIPTION – 12MM CSBGA (PRELIMINARY)...........99