PXD20RM Datasheet, PDF (1216/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

IDLE INSTRUCTION ADDRESS
MODE
DUMMY
DATA
IDLE
PCSFx
SCKFx
IOFx[0]
Single Instructions
Driven all the time, values taken according to phase
IOFx[3:2]
IOFx[1:0]
IOFx[3:2]
IOFx[3:0]
Driven high all the time
Dual Instructions
Not Driven
Driven for
Tx Instr. only
Driven high all the time
Quad Instructions
Not Driven
Driven for
Tx Instr. only
Figure 35-2. Serial Flash Access Scheme
The different phases and the I/O driving characteristics of the QuadSPI module are characterized in the
following way:
• IDLE: Serial flash device not selected. No interaction with the serial flash device. All IOFx signals
driven.
• INSTRUCTION: Serial flash device selected. The instruction is sent to the serial flash device. All
IOFx signals are driven.
35-6
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor