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INITIAL STATE
1)
THE TSA USES THE FIRST PART OF
THE RAM, AND THE SHADOW IS
THE SECOND PART OF THE RAM.
x
CSR
N = 0
CSRRA=0
CSRTA=0
PROGRAMMING
1)
PROGRAM THE
SHADOW RAM FOR THE NEW
RX AND TX ROUTE AND SETS
x
CSR
N.
CSRRA=1
CSRTA=1
EXCHANGE
THE SERIAL ENTERFACE
EXCHANGES BETWEEN
THE SHADOW AND THE
CURRENT-ROUTE RAMS
AND RESETS THE CSR
CSRRA=0
CSRTA=0
Figure 16-51. Serial Interface RAM Dynamic Changes
MOTOROLA
RAM ADDRESS:
0
31 32
16 RXA
ROUTE
L1RCLKA
FRAMING SIGNALS:
L1RSYNCA
RAM ADDRESS:
64
95
16 TXA
ROUTE
L1TCLKA
FRAMING SIGNALS:
L1TSYNCA
RAM ADDRESS:
0
31 32
16 RXA
ROUTE
L1RCLKA
FRAMING SIGNALS:
L1RSYNCA
RAM ADDRESS:
64
95
16 TXA
ROUTE
L1TCLKA
FRAMING SIGNALS:
L1TSYNCA
RAM ADDRESS:
0
31 32
16 RXA
SHADOW
FRAMING SIGNALS:
x
N.
64
95
RAM ADDRESS:
16 TXA
SHADOW
FRAMING SIGNALS:
MPC823e REFERENCE MANUAL
Communication Processor Module
63
16 RXA
SHADOW
96
127
16 TXA
SHADOW
63
16 RXA
SHADOW
96
127
16 TXA
SHADOW
63
16 RXA
ROUTE
L1RCLKA
L1RSYNCA
96
127
16 TXA
ROUTE
L1TCLKA
L1TSYNCA
16-127
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