Address
Address Data
TSIZ
AA=1
AA=0
AA=1
AA=0
FB_CLK
FB_RW
FB_TS
FB_ALE
FB_CSn
FB_OEn
FB_BE/BWEn
FB_TA
FB_TSIZ[1:0]
Basic Write-Bus Cycle (No Wait States)
basicWrite.svg
FB_AD[31:X] indicates a 32-, 16-, 8-bit address/data bus (or custom size).
FB_AD[Y:0] indicates a 32-, 16-, 8-bit address bus (or custom size).
FB_AD[Y :0]
FB_AD[31:X ]
Figure 31-6. Basic Write-Bus Cycle
31.4.11.3
Bus Cycle Sizing
This section shows timing diagrams for various port size scenarios.
31.4.11.3.1
Bus Cycle Sizing—Byte Transfer, 8-bit Device, No Wait States
The following figure illustrates the basic byte read transfer to an 8-bit device with no wait
states:
•
The address is driven on the full FB_AD[31:0] bus in the first clock.
Chapter 31 External Bus Interface (FlexBus)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 713
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