System Configuration and Protection
MPC561/MPC563 Reference Manual, Rev. 1.2
6-4
Freescale Semiconductor
6.1.1.1
USIU Pin Multiplexing
Some of the functions defined in the various sections of the USIU (external bus interface, memory
controller, and general-purpose I/O) share pins.
summarizes how the pin functions of these
multiplexed pins are assigned.
.
6.1.1.2
Arbitration Support
Two bits in the SIUMCR control USIU bus arbitration. The external arbitration (EARB) bit determines
whether arbitration is performed internally or externally. If EARB is cleared (internal arbitration), the
external arbitration request priority (EARP) bit determines the priority of an external master’s arbitration
request. The operation of the internal arbiter is described in
Section 9.5.7.4, “Internal Bus Arbiter
.”
6.1.2
External Master Modes
External master modes are special modes of operation that allow an alternative master on the external bus
to access the internal modules for debugging and backup purposes. They provide access to the internal
buses (U-bus and L-bus) and to the intermodule bus (IMB3).
There are two external master modes:
•
Peripheral mode (enabled by setting PRPM in the external master control (EMCR) register) uses a
special slave mechanism that shuts down the RCPU and an alternative master on the external bus
can perform accesses to any internal bus slave.
Table 6-1. USIU Pin Multiplexing Control
Pin Name
Multiplexing Controlled by:
IRQ0 / SGPIOC0 / MDO4
IRQ1 / RSV / SGPIOC1
IRQ2 / CR / SGPIOC2 / MTS
IRQ3 / KR / RETRY / SGPIOC3
IRQ4 / AT2 / SGPIOC4
IRQ5 / SGPIOC5 / MODCK1
IRQ6 / MODCK2
IRQ7 / MODCK3
At Power-On Reset: MODCK[1:3]
Otherwise: Programmed in SIUMCR
Note:
MDO4 is controlled by READI enable.
SGPIOC6 / FRZ / PTR
SGPIOC7 / IRQOUT / LWP0
BG / VF0 / LWP1
BR / VF1 / IWP2
BB / VF2 / IWP3
IWP[0:1] / VFLS[0:1]
BI / STS
WE[0:3] / BE[0:3] / AT[0:3]
TDI/DSDI / MDI0
TCK / DSCK / MCKI
TDO / DSDO / MDO0
Programmed in SIUMCR and Hard Reset Configuration
Note:
MDIO, MCKI, and MDO0 are controlled by READI enable.
DATA[0:31] / SGPIOD[0:31]
ADDR[8:31] / SGPIOA[8:31]
Programmed in SIUMCR
RSTCONF /TEXP
At Power-On Reset: RSTCONF
Otherwise: Programmed in SIUMCR
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...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
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...