cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 256

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

Buffer Controller FIFO Size Calculation
E.3
E.4
E.4.1
E-6
Mesg Len
45
41
56
57
61
General Buffer Wastage
Overview of Analysis
Preliminary Calculations
Most wasteful in terms of bytes => 57-byte messages
Most wasteful in terms of transactions => 57-byte messages
Conclusion: If a buffer that has been filled with 57-byte messages can successfully
converge to a solution, any other combination will similarly converge.
Bytes in Fifo
• Calculate maximum amounts of data that can arrive between services.
• Calculate maximum number of services that can be missed due to algorithms
52
48
60
68
72
used.
Mesg Len
Mindspeed Technologies™
45
41
56
57
61
Advance Information
# Trans
1
1
1
2
2
Bytes in FIFO
52
48
60
68
72
Trans/Mesg Byte
0.022
0.024
0.018
0.035
0.033
% Waste
13.5
14.6
16.2
15.3
6.7
Trans/FIFO Byte
CX28560 Data Sheet
28560-DSH-001-B
0.019
0.021
0.017
0.029
0.028