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Communication Processor Module
16.7.4.5 PROGRAMMING THE SERIAL INTERFACE RAM ENTRIES. The programming
of each word within the RAM determines the routing of the serial bits and assertion of strobe
outputs. The RAM programming codes are shown in the following table.
SERIAL INTERFACE RAM ENTRIES
BIT
0
1
2
FIELD
LOOP SWTR SSEL1 SSEL2 SSEL3 SSEL4
RESET
0
0
0
R/W
R/W
R/W
R/W
ADDR
BIT
16
17
18
FIELD
RESET
1
1
1
R/W
ADDR
LOOP—Loopback
0 = Normal mode.
1 = Loopback mode for this time-slot.
SWTR—Switch Transmit and Receive
This bit is only valid in the receive route RAM and is ignored in the transmit route RAM. This
bit affects the operation of both the L1RXDx and L1TXDx pins. The SWTR bit is only set in
special situations in which you prefer to receive data from a transmit pin and transmit data
on a receive pin. For instance, consider the situation in which devices A and B are
connected to the same time-division multiplex, each with different time-slots. Normally, there
is no opportunity for stations A and B to communicate with each other directly over the
time-division multiplex since they both receive the same TDM receive data and transmit on
the same TDM transmit signal.
RX
TX
STATION A
16-122
3
4
5
6
7
RES
0
0
0
0
R/W
R/W
R/W
R/W
(IMMR & 0xFFFF0000) + 0xC00 TO 0xDFF
19
20
21
22
23
RESERVED
1
1
1
1
1
R/W
(IMMR & 0xFFFF0000) + 0xC00 TO 0xDFF
TDM RECEIVE DATA
TDM TRANSMIT DATA
RX
TX
STATION B
Figure 16-50. Using the SWTR Bit
MPC823e REFERENCE MANUAL
8
9
10
11
12
CSEL
CNT
0
0
R/W
R/W
24
25
26
27
28
1
1
1
1
1
13
14
15
BYT
LST
0
0
R/W
R/W
29
30
31
1
1
1
MOTOROLA
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