cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 229

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

CX28560 Data Sheet
B.5.3
28560-DSH-001-B
Building the Flexiframe
The following equations show that if the Flexiframe is built according to the guidance
outlined above, building a Flexiframe for any legal configuration of the CX28560 is
possible:
It has been shown above that in 21,504 slots the following is true:
Now considering the first 10,752 slots of the frame. If the frame is to be built, the
following must be true:
Since (1) has been proven, and all of the following are true:
A = 2 B + r
A <= 21,504
r >= 0
By simple substitution the following holds:
2 B + r <= 21,504
B <= 10,752
Hence equation (2) holds.
The same method of substitution and comparison can be used to show that all the
following equations are true:
The above set of equations therefore show that if, when building a Flexiframe, the
rules outlined are followed, it will always be possible to build a Flexiframe.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
A = 1024 a + 768 b + 512 c + 384 d + 256 e + 192 f + 128 g + 96 h + 64 i + 48
j + 32 k + 24 l + 16 m + 12 n + 8 o + 6 p + 4 q + 3 r + 2 s <= 21,504
B = 512 a + 384 b + 256 c + 192 d + 128 e + 96 f + 64 g + 48 h + 32 I +
24 j + 16 k + 12 l + 8 m + 6 n + 4 o + 3 p + 2 q + r + s <= 10752
256 a + 192 b + 128 c + 96 d + 64 e + 48 f + 32 g + 24 h + 16 i + 12 j + 8 k + 6
l + 4 m + 3 n + 2 o + p + q <= 5,376
128 a + 96 b + 64 c + 48 d + 32 e + 24 f + 16 g + 12 h + 8 i + 6 j + 4 k +
3 l + 2 m + n + o <= 2,688
64 a + 48 b + 32 c + 24 d + 16 e + 12 f + 8 g + 6 h + 4 i + 3 j + 2 k + l + m <=
1344
32 a + 24 b + 16 c + 12 d + 8 e + 6 f + 4 g + 3 h + 2 i + j + k <= 672
16 a + 12 b + 8 c + 6 d + 4 e + 3 f + 2 g + h + i <= 336
8 a + 6 b + 4 c + 3 d + 2 e + f + g <= 168
4 a + 3 b + 2 c + d + e <= 84
2 a + b + c <= 42
a <= 21
Mindspeed Technologies™
Advance Information
Flexiframe Algorithm
B
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11