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Functional Description
P2 Signal Multiplexing (P2MX)
3
3-4
Because of a limited number of pins on the P2 connector, both the VME
processor board and the MVME761 transition module multiplex and de-
multiplex some of the P2 signals. This function, called P2MX is
transparent to the software and the user.
Four pins are used for the signal multiplexing:
MXCLK
MXSYNC#
MXDO
MXDI
Sixteen time slots are defined and allocated. The signal multiplexing
sequences are listed in
Table 3-1. P2 signal multiplexing sequence
MXDO
(from the
MVME260x/MVME270x/MVME360x/
MVME460x)
Time Slot
Signal Name
0
RTS3
1
DTR3
2
LLB3/MODSEL
3
RLB3
4
RTS4
5
DTR4
6
LLB4
7
RLB4
8
IDREQ#
9
DTR1
10
DTR2
Table
3-1.
MXDI
(from the MVME761)
Time Slot
Computer Group Literature Center Web Site
Signal Name
0
CTS3
1
DSR3/MID1
2
DCD3
3
TM3/MID0
4
RI3
5
CTS4
6
DSR4/MID3
7
DCD4
8
TM4/MID2
9
RI4
10
RI1
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