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Chapter 30 Flash Memory
MPC5606BK Microcontroller Reference Manual, Rev. 2
886
Freescale Semiconductor
30.8.11 Wait-state emulation
Emulation of other memory array timings are supported by the platform flash memory controller on read
cycles to the flash memory. This functionality may be useful to maintain the access timing for blocks of
memory that were used to overlay flash memory blocks for the purpose of system calibration or tuning
during code development.
The platform flash memory controller inserts additional wait-states according to the values of
haddr[28:24]. When these inputs are non-zero, additional cycles are added to AHB read cycles. Write
cycles are not affected. In addition, no page read buffer prefetches are initiated, and buffer hits are ignored.
show the relationship of haddr[28:24] to the number of additional primary
wait-states. These wait-states are applied to the initial access of a burst fetch or to single-beat read accesses
on the AHB system bus.
Note that the wait-state specification consists of two components: haddr[28:26] and haddr[25:24], and
effectively extends the flash memory read by (8 × haddr[25:24] + haddr[28:26]) cycles.
shows the relationship of haddr[25:24] to the number of additional wait-states. These are
applied in addition to those specified by haddr[28:26], and thus extend the total wait-state specification
capability.
Table 30-65. Platform flash memory controller stall-while-write interrupts
MIR[n]
Interrupt description
ECSM.MIR[0]
Platform flash memory bank0 abort notification, MIR[FB0AI]
ECSM.MIR[1]
Platform flash memory bank0 stall notification, MIR[FB0SI]
ECSM.MIR[2]
Platform flash memory bank1 abort notification, MIR[FB1AI]
ECSM.MIR[3]
Platform flash memory bank1 stall notification, MIR[FB1S1]
Table 30-66. Additional wait-state encoding
Memory address
haddr[28:26]
Additional wait-states
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7
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