RELEASED
PM73123 AAL1GATOR-8
DATASHEET
PMC-2000097
ISSUE 2
8 LINK CES/DBCES AAL1 SAR
Table 8 Frequency Select – T1 Mode
Freq Select
-128
M
N
Total # Cycles Frequency
560
560
560
560
2432
2432
2432
2432
2992
2992
2992
2992
1.5436433121
1.5436433121
1.5436433121
1.5436433121
-127
-126
-125
…
-96
-95
-94
-93
-92
…
560
560
560
560
560
…
…
…
2432
2433
2434
2435
2436
2992
2993
2994
2995
2996
1.5436433121
1.5436471447
1.5436509747
1.5436548021
1.5436586271
…
-4
-3
-2
-1
0
1
2
3
4
…
560
560
560
560
560
560
560
560
560
…
…
…
2524
2525
2526
2527
2528
2529
2530
2531
2532
3084
3085
3086
3087
3088
3089
3090
3091
3092
1.5439855782
1.5439891871
1.5439927937
1.5439963980
1.5440000000
1.5440035997
1.5440071970
1.5440107921
1.5440143848
…
93
94
95
96
…
560
560
560
560
…
…
…
2621
2622
2623
2624
3181
3182
3183
3184
1.5443251545
1.5443285482
1.5443319399
1.5443353293
…
124
125
126
127
…
560
560
560
560
…
…
…
2624
2624
2624
2624
3184
3184
3184
3184
1.5443353293
1.5443353293
1.5443353293
1.5443353293
* Note that the synthesizers are limited internally to a freq select range of –96 to
96 in order to maintain a +/- 230 ppm range.
9.3.3.8.2 E1 Mode
In E1 mode the 2.048 MHz nominal frequency is synthesized by maintaining a
certain ratio of long cycles to short cycles. The long cycle is comprised of 19
SYS_CLK periods (38.88 MHz). The short cycle is comprised of 18 SYS_CLK
periods. For the nominal frequency in high resolution mode, the synthesis period
is comprised of 1024 cycles. 1008 of the 1024 cycles are long cycles and the
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL
149
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