Service manual

7.3 DWMBB Functional Description
The <REFERENCE>(xbi_plus) adapter provides an informa-
tion path between the <REFERENCE>(XMI) bus and I/O de-
vices on the VAXBI bus. The <REFERENCE>(xbi_plus) con-
sists of two modules: the <REFERENCE>(XBIA) and the
<REFERENCE>(XBIB). The <REFERENCE>(XBIA) resides on
the <REFERENCE>(XMI) bus, and the <REFERENCE>(XBIB)
resides on the VAXBI bus. Four 30-pin cables, which make
up the IBUS, connect the two modules.
Figure 7–4: <REFERENCE>(XBI_TITLE) Block Diagram
DWMBB/A
MODULE
LOGIC
XMI
CORNER
VAXBI
CORNER
(BIIC)
IBUS
VAXBIXMI
T1043 MODULE
T2018 MODULE
msb-0062A-90
DWMBB/B
MODULE
LOGIC
7–8 VAX 6000 Models 300 and 400 Service Manual