NXP Semiconductors freescale semiconductor ColdFire MCF51CN128 Series, Reference Manual

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Mini-FlexBus
11-17 Freescale Semiconductor
MCF51CN128 Reference Manual, Rev. 6
Figure 11-14 and Figure 11-15 show the basic read and write bus cycles (also shown in Figure 11-7 and
Figure 11-12 ) with the default of no wait states.
Figure 11-14. Basic Read-Bus Cycle (No Wait States)
Figure 11-15. Basic Write-Bus Cycle (No Wait States)
FB_CLK
FB_R/W
FB_ALE
S0 S1 S2 S3
DATA
DATA
Mux’d Bus
Non-Mux’d Bus
FB_A[19:0]
ADDR[19:0]
FB_D[7:0]
ADDR[ X :0]
FB_AD[19: X+1 ]
ADDR[19: X+1 ]
FB_AD[ X :0]
FB_CS n , FB_OE
S0
FB_CLK
FB_R/W
FB_ALE
FB_OE
S0 S1 S2 S3
DATA
DATA
Mux’d Bus
Non-Mux’d Bus
FB_A[19:0]
ADDR[19:0]
FB_D[7:0]
ADDR[ X :0]
FB_AD[19: X+1 ] ADDR[19: X+1 ]
FB_AD[ X :0]
FB_CS n
S0