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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
12-62
Freescale Semiconductor
Figure 12-44. Single Beat CS Read Cycle in External Master Mode, Zero Wait States
12.4.2.10.4 Back-to-Back Transfers in External Master Mode
The following timing diagrams show examples of back-to-back accesses in external master mode. In these
examples, the reads and writes shown are to a shared external memory, and the EBI is assumed to be
configured for internal arbitration while the external master is configured for external arbitration.
shows an external master read followed by an MCU read to the same chip select bank.
shows an MCU read followed by an external master read to a different chip select bank.
shows an external master read followed by an external master write to a different chip select
bank. This case assumes the MCU has no higher priority internal request pending and is able to park the
external master on the bus.
Receive bus busy negated for 2nd cycle
Assert BB drive address and assert TS
Using the internal arbiter
CLKOUT
BR (Input)
RD_WR
TSIZ[0:1]
BDIP
BG
BB
ADDR[8:31]
DATA[0:31]
TS
TA
CSx
OE
DATA is valid
Содержание MPC5553
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