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Functional Description
3
P2 Signal Multiplexing (P2MX)
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)
MXDI
(from the MVME761)
Time Slot
Signal Name
Time Slot
Signal Name
0
RTS3
0
CTS3
1
DTR3
1
DSR3/MID1
2
LLB3/MODSEL
2
DCD3
3
RLB3
3
TM3/MID0
4
RTS4
4
RI3
5
DTR4
5
CTS4
6
LLB4
6
DSR4/MID3
7
RLB4
7
DCD4
8
IDREQ#
8
TM4/MID2
9
DTR1
9
RI4
10
DTR2
10
RI1