External Bus Interface (EBI)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
Freescale Semiconductor
29-45
Preliminary
Figure 29-32. 32-bit Non-Chip-Select Read with DBM=1
Figure 29-33. 32-bit Non-Chip-Select Write with DBM=1
29.4.2.11 Address Data Multiplexing
Address/data multiplexing enables the design of a system with reduced pin count. In such system,
multiplexed address/data functions (on AD pins) are used, instead of having separate address and data
pins. Compared to the normal EBI specification (e.g. 24 address pins+32 data pins), only 32 data pins are
required. Compared to a 16-bit bus implementation, only 24 pins are required (e.g. ADDR[8:15] +
ADDR[16:31]/DATA[16:31]).
CLKOUT
RD_WR
BDIP
ADDR[8:31]
DATA[0:15]
TS (Output)
Minimum
2 wait states
DATA is valid
TA (Input)
DATA is valid
DATA is valid
CLKOUT
RD_WR
BDIP
ADDR[8:31]
DATA[0:15]
TS (Output)
Minimum
3 wait states
TA (Input)
DATA is valid