Modular Input/Output Subsystem (MIOS14)
MPC561/MPC563 Reference Manual, Rev. 1.2
17-10
Freescale Semiconductor
•
The read/write and control bus
•
The request bus
•
The counter bus set
17.3.3
Read/Write and Control Bus
The read/write and control bus (RWCB) allows read and write data transfers to and from any I/O
submodule through the MBISM. It includes signals for data and addresses as well as control signals. The
control signals allow 16-bit simple synchronous single master accesses and supports fast or slow master
accesses.
17.3.4
Request Bus
The request bus (RQB) provides interrupt request signals along with I/O submodule identification and
priority information to the MBISM.
NOTE
Some submodules do not generate interrupts and are therefore independent
of the RQB.
17.3.5
Counter Bus Set
The 16-bit counter bus set (CBS) is a set of six 16-bit counter buses. The CBS makes it possible to transfer
information between submodules. Typically, counter submodules drive the CBS, while action submodules
process the data on these buses. Note, however, that some submodules are self-contained and therefore
independent of the counter bus set.
17.4
MIOS14 Programming Model
The address space of the MIOS14 consist of 4 Kbytes starting at the base address of the module
(0x306000). The overall address map organization is shown in
All MIOS14 unimplemented locations within the addressable range, return a logic 0 when accessed. In
addition, the internal TEA (transfer error acknowledge) signal is asserted.
All unused bits within MIOS14 registers return a 0 when accessed.
17.4.1
Bus Error Support
A bus error signal is generated when access to an unimplemented or reserved 16-bit register is attempted,
or when a priviledge violation occurs. A bus error is generated under any of the following conditions:
•
Attempted access to unimplemented 16-bit registers within the decoded register block boundary.
•
Attempted user access to supervisor registers
•
Attempted access to test registers when not in test mode
•
Attempted write to read-only registers
Summary of Contents for MPC561
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Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
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Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...