External Bus Interface (EBI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
12-56
Freescale Semiconductor
describe read and write cycles from an external master accessing internal
space in the MCU. The minimal latency for an external master access is three clock cycles. The actual
latency of an external to internal cycle varies depending on which internal module is being accessed and
how much internal bus traffic is going on at the time of the access.
Figure 12-36. External Master Read from MCU
Figure 12-37. External Master Write to MCU
CLKOUT
RD_WR
BDIP
ADDR[8:31]
DATA[0:31]
TS (input)
Minimum
2 wait states
DATA is valid
TA (output)
If the external master is another MCU with this EBI, then DATA remains valid as shown due to use
of latched TA internally. These extra data valid cycles (past TA) are not required by the slave EBI.
**
CLKOUT
RD_WR
BDIP
ADDR[8:31]
DATA[0:31]
TS (input)
Minimum
2 wait states
DATA is valid
TA (output)
DATA is valid
**
Содержание MPC5565
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Страница 895: ...Deserial Serial Peripheral Interface DSPI MPC5565 Microcontroller Reference Manual Rev 1 0 19 72 Freescale Semiconductor...
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