RELEASED
PM73123 AAL1GATOR-8
DATASHEET
PMC-2000097
ISSUE 2
8 LINK CES/DBCES AAL1 SAR
Figure 122 SYS_CLK Timing
SYSCLK
16.3 NCLK Timing
Table 33 NCLK Timing
Symbol
Description
Min
Max
Units
fNCLK
NCLK Frequency (See notes
below)
77.76
+50ppm
MHz
dNCLK
NCLK Duty Cycle
40
60
Notes on NCLK Timing:
1. If DS3 is used NCLK should be 77.76 +/- 50 ppm.
2. An internal divider is available in the A1SP, which can divide down the NCLK
frequency. The internal NCLK frequency needs to be 2.43 MHz +/- 50 ppm
for E1 and T1, 38.88 MHz +/- 50 ppm for E3, and 77.76 MHz +/-50 ppm for
DS3.
Figure 123 NCLK Timing
NCLK
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL
338
PMC [ PMC-SIERRA, INC ]
