User manual

Chapter 6 System Configuration

9. Determine the range of addresses that will be occupied by each

device in the first-level MXIbus links. Remember that the range of

addresses occupied by these devices must be within the range of

addresses assigned to MXIbus link to which it is a member. Start

with the largest device in the MXIbus link.

In the example system, MXIbus #1 has four devices. The largest

one is VXIbus Mainframe #3, which requires 64 logical addresses.

This device has a second-level MXIbus link that needs 32 logical

addresses, and the mainframe needs eight logical addresses for its

own devices. First, assign the devices in the mainframe to the

lowest available range within the allotted address range of

MXIbus #1: 80 to 87 hex. Then assign MXIbus #3 the lowest

available range of size 32: A0 to BF hex. The next largest device,

VXIbus Mainframe #2, needs 32 logical addresses and is assigned

the next lowest available range of 32: C0 to DF hex. MXIbus

Device A needs four logical addresses and MXIbus Device B

needs one address. They are assigned E0 to E3, and E4,

respectively.

10. Determine the range of addresses that will be occupied by each

second-level device and MXIbus link. Remember that the range of

addresses occupied by second-level devices must be within the

range of addresses assigned to the device one level above it. Once

the first-level MXIbus links have been allocated, assign the

MXIbus devices and second-level MXIbus links within the

corresponding first-level devices, starting with the largest device.

In the example system, we assigned MXIbus #3 address range A0

to BF hex. MXIbus #3 has two devices: VXIbus Mainframe #4

and VXIbus Mainframe #5. Each requires 16 logical addresses;

therefore, we assigned them address ranges A0 to AF hex, and B0

to BF hex, respectively.