cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 227

• Manufacturer Part Number: cx28560
• Description: Hdlc Controller
• Manufacturer: Mindspeed Technologies

CX28560 Data Sheet
B.5
Table B-2. Flexiframe Analysis Parameters
28560-DSH-001-B
52
39 (mid range)
26
19.5 (mid range)
13
9.75 (mid range)
6.5
4.875 (mid range)
3.25
2.438 (mid range)
1.625
1.219 (mid range)
0.813
0.609 (mid range)
0.406
0.304 (mid range)
0.203
0.152 (mid range)
0.101
0.064 (min)
Channel MAX Bandwidth
[Mbps]
Analysis
This analysis is based a number of fixed parameters. If these parameters are to be
changed, the analysis should be performed with the new values. The fixed parameters
are:
To arrive at the minimum frame size required for all configurations, the analysis was
performed several times until a minimum was reached. This document only includes
the proof that a 21,504 slot Flexiframe will suffice, and not that this is the minimum
required.
Table B-2
variable allocation to group ranges, and the number of slots to be allocated to each
variable in a 21,504 slot Flexiframe.
• Fragment length of 32 bytes (plus 4 header bytes)
• Slot time of 20 cycles
21
42 + 84
42
84
168
336
672
1344
2688
5376
10752
84 + 168
168 + 336
336 + 672
672 + 1344
1344 + 2688
2688 + 5376
5376 + 10752
10752 + 21504
forms the basis for the analysis. Contained in it are the bit-rate group limits,
Step Size
Mindspeed Technologies™
—
Advance Information
1024
512 + 256
512
256 + 128
256
128 + 64
128
64 + 32
64
32 + 16
32
16 + 8
16
8 + 4
8
4 + 2
4
2 + 1
2
Number of Slots in a 21,504
Frame
—
a [52 – 39]
b [39 – 26]
c [26 – 19.5]
d [19.5 – 13]
e [13 – 9.75]
f [9.75 – 6.5]
g [6.5 – 4.875]
h [4.875 – 3.25]
i [3.25 – 2.438]
j [2.438 – 1.625]
k [1.625 – 1.219]
l [1.219 – 0.813]
m [0.813 – 0.609]
n [0.609 – 0.406]
o [0.406 – 0.304]
p [0.304 – 0.203]
q [0.203 – 0.152]
r [0.152 – 0.101]
s [0.101 – 0.064]
channels in the [Range]
Variable (Number of
[Mbps])
—
Flexiframe Algorithm
B
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