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Functional Description
3
The MX function is used with PALs and some discrete devices.
MXSYNC# is clocked out using the falling edge of MXCLK and MXDO
by using the rising edge of the MXCLK. MXDI is sampled at the rising
edge of MXCLK (the transition module synchronizes MXDI with
MXCLK’s rising edge). The timing relationships among MXCLK,
MXSYNC#, MXDO, and MXDI are shown in
Figure 3-3
:
Table 3-2. Multiplexing Sequence of the MX Function
MXDO
(From MCP750)
MXDI
(From TMCP700)
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
Reserved
9
RI4
10
Reserved
10
Reserved
11
Reserved
11
Reserved
12
Reserved
12
Reserved
13
Reserved
13
Reserved
14
Reserved
14
Reserved
15
Reserved
15
Reserved