External Bus Interface (EBI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
12-52
Freescale Semiconductor
12.4.2.10 Bus Operation in External Master Mode
External master mode enables an external master to access the internal address space of the MCU.
shows how to connect an MCU to an external master (a second MCU) and a shared SDR
memory to operate in external master mode. Limited support for external master accesses (master/slave
systems only) is available in the MPC5565, refer to
Section 12.5.5, “Dual-MCU Operation with Reduced
.”
Figure 12-33. MCU Connected to External Master and SDR Memory
When the external master requires external bus accesses, it takes ownership on the external bus, and the
direction of most of the bus signals is inverted, relative to its direction when the MCU owns the bus.
Most of the bidirectional signals shown in
are only driven by the EBI when the EBI owns the
external bus. The only exceptions are the TA and TEA signals (described in
Section 12.4.2.9, “Termination
CLKOUT
CS[0]
TS
WE/BE[0]
ADDR[8:31]*
DATA[0:31]
BDIP
RD_WR
TA
TEA
CK
CS
ADV
BAA
WE
A[0:21]
DATA[0:31]
SDR
Memory
Master MCU
internal arbitration
EXTAL
CS[0]
TS
WE/BE[0]
ADDR[8:31]*
DATA[0:31]
BDIP
RD_WR
TA
TEA
Slave MCU
Configured for
external arbitration
* Only ADDR[8:29] are connected to the 32-bit SDR memory.
Configured for
Содержание MPC5565
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