Datasheet

1.4 Drive Operation on the Loop
C141-C008 1-27
Step Port Name n n+1 n+2
[1] Transmits LISM with its own
port name to the next port.
LISM (n) LISM (n+1) LISM (n+2)
[2] Receives LISM from the upper
loop port.
LISM (n+2) LISM (n) LISM (n+1)
[3] Compares the port name with its
own port name and transmits
LISM with lower port name.
LISM (n) LISM (n) LISM (n+1)
[4] Receives LISM from the upper
loop port.
LISM (n+1) LISM (n) LISM (n)
[5] Compares the port name with its
own port name and transmits
LISM with lower port name.
LISM (n) LISM (n) LISM (n)
[6] Receives LISM from the upper
loop port.
LISM (n) LISM (n) LISM (n)
[7] Compares the port name with its
own port name and if they are
the same, the port becomes loop
master.
[8] Loop master transmits ARB
(F0) ans waits for the ARB (F0)
comes back.
ARB (F0)
[9] Loop master checks ARB (F0)
ARB (F0)
Note:
The value is assigned to each port uniquely in production.
Figure 1.11 Process for selecting loop master
<non loop master> <non loop master><loop master>