Cypress FM4 Series - Automatic Wait Setup

CHAPTER 14: External Bus Interface
776 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
3.7 Automatic Wait Setup
The following explains the automatic wait function.
The automatic wait function sets an automatic wait time per MCSX area for external accesses with the
register setups. The parameters to which the automatic wait can be set are shown in Table 3-6 and Table
3-7. Figure 3-12 through Figure 3-16 show specific examples where the automatic wait is assigned.
Table 3-6 Automatic Wait Setup List
Available Point
Register Name
Available Cycle
Remarks
Number of cycles from access start to
ALE output and address output start
ATIMn:ALES
0 to 15 cycles
(ALES) Cycle
Multiplex mode only
ALE output width
ATIMn:ALEW
1 to 16 cycles
(ALEW+1) Cycle
Multiplex mode only
Period from access start to address
output end
ATIMn:ALC
1 to 16 cycles
(ALC+1) Cycle
Multiplex mode only
Number of cycles until the MOEX↓ after
ALC period is ended
TIMn:RADC
0 to 15 cycles
(RADC) Cycle
CS effective period in read cycle
TIMn:RACC
1 to 16 cycles
(RACC+1) Cycle
Number of idle cycles after read
TIMn:RIDLC
1 to 16 cycles
(RIDLC+1) Cycle
Number of first read address waiting
cycles at page read access
TIMn:FRADC
0 to 15 cycles
Only PAGE=1 and MOEXEUP=0
Number of cycles while MOEX is low
1 to 16 cycles
(FRADC+1) Cycle
Only PAGE=0 and MOEXEUP=1
Number of cycles until the MWEX↓
after ALC period is ended
TIMn:WADC
1 to 15 cycles
(WADC+1) Cycle
Number of cycles while MWEX is low
TIMn:WWEC
1 to 15 cycles
(WWEC+1) Cycle
CS effective period in write cycle
TIMn:WACC
3 to 16 cycles
(WACC+1) Cycle
Number of idle cycles after write
TIMn:WIDLC
1 to 16 cycles
(WIDLC+1) Cycle
*: Number of cycles is counted based on MCLKOUT.