Motorola MPC8260 User Manual
MOTOROLA
Chapter 14. Serial Interface with Time-Slot Assigner
14-25
Part IV. Communications Processor Module
Table 14-7 describes SIxCMDR Þelds.
14.5.5 SI Status Registers (SIxSTR)
The SI status register (SIxSTR), shown in Figure 14-20, identiÞes the current-route RAM.
SIxSTR values are valid only when the corresponding SIxCMDR bit = 0.
SIxSTR values are valid only when the corresponding SIxCMDR bit = 0.
Table 14-8 describes SIxSTR Þelds.
14.6 Serial Interface IDL Interface Support
The IDL interface is a full-duplex ISDN interface used to connect a physical layer device
to the MPC8260. The MPC8260 supports both the basic and primary rate of the IDL bus.
to the MPC8260. The MPC8260 supports both the basic and primary rate of the IDL bus.
Table 14-7. SIxCMDR Field Description
Bits
Name
Description
0, 2,
4, 6
4, 6
CSRRx
Change shadow RAM for TDM a, b, c, or d receiver. Set CSRRx causes the SI receiver to replace
the current route RAM with the shadow RAM. Set by the user and cleared by the SI.
0 The receiver shadow RAM is not valid. The user can write into the shadow RAM to program a
the current route RAM with the shadow RAM. Set by the user and cleared by the SI.
0 The receiver shadow RAM is not valid. The user can write into the shadow RAM to program a
new routing.
1 The receiver shadow RAM is valid. The SI exchanges between the RAMs and take the new
receive routing from the receiver shadow RAM. Cleared as soon as the switch has completed.
1, 3,
5, 7
5, 7
CSRTx
Change shadow RAM for TDM a, b, c, or d transmitter. Set CRSTx causes the SI transmitter to
replace the current route RAM with the shadow RAM. Set by the user and cleared by the SI.
0 The transmitter shadow RAM is not valid. The user can write into the shadow RAM to program a
replace the current route RAM with the shadow RAM. Set by the user and cleared by the SI.
0 The transmitter shadow RAM is not valid. The user can write into the shadow RAM to program a
new routing.
1 The transmitter shadow RAM is valid. The SI exchanges between the RAMs and take the new
transmitter routing from the receiver shadow RAM. Cleared as soon as the switch has completed.
Bits
0
1
2
3
4
5
6
7
Field
CRORA
CROTA
CRORB
CROTB
CRORC
CROTC
CRORD
CROTD
Reset
0000_0000
R/W
R
Addr
Figure 14-20. SI Status Registers (SIxSTR)
Table 14-8. SIxSTR Field Descriptions
Bits
Name
Description
0, 2,
4, 6
4, 6
CRORx
Current-route original receiver. Determines whether the current-route receiver RAM is the original
or the shadow.
0 The current-route receiver RAM is the original one.
1 The current-route receiver RAM is the shadow.
or the shadow.
0 The current-route receiver RAM is the original one.
1 The current-route receiver RAM is the shadow.
1, 3,
5, 7
5, 7
CROTx
Current-route original transmitter. Determines whether the current-route transmitter RAM is the
original or the shadow.
0 The current-route transmitter RAM is the original one.
1 The current-route transmitter RAM is the shadow.
original or the shadow.
0 The current-route transmitter RAM is the original one.
1 The current-route transmitter RAM is the shadow.