Transfer Cycle; Figure 5-3 Transfer Cycle; Table 5-1 Transfer Cycle Calculation Formulas - Hitachi SD.LINK User Manual

5.2 Transfer Cycle

CPU-0
LPU-0
CPU-1
LPU-1
CPU-2
LPU-2
The memory transfer operation described in "5.1 Operation" takes place at the timings shown in
Figure 5-3. The time-base is taken on the horizontal axis.
The sharing operation begins with CPU-0 (or LPU-0) transferring, and ends with CPU-2 (or LPU-
2) transferring. This sequence is cyclically carried out to allow memory transfer areas to be
shared.
The transfer cycle depends on the module number setting switch, the number of units connected,
and data traffic and is calculated by solving the formulas listed in Table 5-1.
Module number setting switch
0, 1
2, 3
4, 5
6, 7
W: Total ring length (km)
X: Number of active modules (units)
Y: Size of word data (words)
Z: Size of bit data (items)
A
B
C

Figure 5-3 Transfer Cycle

Table 5-1 Transfer Cycle Calculation Formulas

192 - 0.5964X + 0.0146Y + 0.0009Z + 0.005WX (ms)
96 - 0.5964X + 0.0146Y + 0.0009Z + 0.005WX (ms)
48 - 0.5964X + 0.0146Y + 0.0009Z + 0.005WX (ms)
24 - 0.5964X + 0.0146Y + 0.0009Z + 0.005WX (ms)
A
B
Transfer cycle
Transfer cycle calculation formula
5-3
5 PROGRAMMING
C