Ebi Operation With Reduced Pinout Mcus - NXP Semiconductors MPC5644A Reference Manual

MCU
* May or may not be connected, depending on the memory used.
** Flash memories typically use one WE signal as shown, RAMs use 2 or 4 (16-bit or 32-bit)
14.6.5

EBI operation with reduced Pinout MCUs

Some MCUs with this EBI may not have all the pins described in this document pinned out for a particular
package. Some of the most common pins to be removed are DATA[16:31] and arbitration pins (BB, BG,
Freescale Semiconductor
CLKOUT
CS0
TS
WE0/BE0
ADDR[3:29]
DATA[0:31]
OE
BDIP
CS1
WE1/BE1
Figure 14-42. MCU Connected to Multiple Memories
MPC5644A Microcontroller Reference Manual, Rev. 6
External Bus Interface (EBI)
CK
SDR Memory
CE
ADV
WE**
A[0:21]
D[0:31]
OE
BAA*
CK
CE
SDR Memory
ADV
A[0:21]
WE**
BAA*
D[0:31]
OE
337