External Bus Interface (EBI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
12-65
12.5.4
Connecting an MCU to Multiple Memories
The MCU can be connected to more than one memory at a time.
shows an example of how to connect two memories to one MCU.
Figure 12-47. MCU Connected to Multiple Flash Memories
12.5.5
Dual-MCU Operation with Reduced Pinout MCUs
Not all the pins described in this document are available or connected in all the MPC5500 packages.
Reduced pins are the DATA[16:31], arbitration pins (BB, BG, BR), TEA, and TSIZ[0:1] pins. This section
describes how to configure dual-MCU systems for packages with reduced pin counts. More than one
section can apply if the pins are not present on one or both MCUs.
12.5.5.1
Connecting 16-bit MCU to 32-bit MCU (Master/Master or Master/Slave)
This scenario is straightforward. Simply connect DATA[0:15] between both MCUs, and configure both for
16-bit data bus mode operation (DBM = 1 in EBI_MCR). This configuration does not support 32-bit
external memories.
CLKOUT
CS[0]
TS
WE/BE[0]
ADDR[8:29]
DATA[0:31]
BDIP
OE
MCU
CK
CE
ADV
WE**
A[0:21]
D[0:31]
OE
BAA*
SDR flash
memory
CK
CE
ADV
WE**
A[0:21]
D[0:31]
OE
BAA*
SDR flash
memory
CS
[
1]
WE/BE[1]
* Connected depending on the memory used.
Flash memories typically use one WE signal as shown.
**
Note:
On a 32-bit bus, RAM memories use all four WE/BE[0:3]. On a 16-bit bus, one
RAM memory uses WE/BE[0:1] and the other uses WE/BE[2:3].
Summary of Contents for MPC5565
Page 18: ...MPC5565 Microcontroller Reference Manual Devices Supported MPC5565 MPC5565 RM Rev 1 0 09 2007...
Page 34: ...MPC5565 Reference Manual Rev 1 0 Freescale Semiconductor 15...
Page 35: ...MPC5565 Reference Manual Rev 1 0 16 Freescale Semiconductor...
Page 553: ...Flash Memory MPC5565 Microcontroller Reference Manual Rev 1 0 13 38 Freescale Semiconductor...
Page 559: ...SRAM MPC5565 Microcontroller Reference Manual Rev 1 0 14 6 Freescale Semiconductor...
Page 973: ...Preface MPC5565 Microcontroller Reference Manual Rev 1 0 21 36 Freescale Semiconductor...
Page 1153: ...Calibration MPC5565 Microcontroller Reference Manual Rev 1 0 B 8 Freescale Semiconductor...