Cypress FM4 Series - Software-Block Transfer

CHAPTER 10: DMAC
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 461
3.1 Software-Block Transfer
This section explains Software-Block transfer.
Figure 3-1 shows an example of the operation of Software-Block transfer. In this example, the following
settings apply.
− Transfer mode: Software request Block transfer (ST=1, IS[5:0]=000000,
MS=00)
− Transfer source start address: SA(DMACSA=SA)
− Transfer source address control: Increment and reload available (FS=0, RS=1)
− Transfer destination start address: DA(DMACDA=DA)
− Transfer destination address control: Increment and reload not available (FD=0, RD=0)
− Transfer data size: Half-word (16 bits), the number of blocks = 2,
the number of transfers = 3 (TW=01, BC=1, TC=2)
− BC/TC reload: Reload available (RC=1)
Figure 3-1 Example of Operation of Software-Block Transfer
SA+0
SA+2
SA+4
SA+6
SA+8
SA+10
DA+0
DA+2
DA+4
DA+6
DA+8
DA+10
CPU
Start request
(Transfer Gap)
SA+0
SA+2
SA+4
SA+6
SA+8
SA+10
DA+12
DA+14
DA+16
DA+18
DA+20
DA+22
DMAC
End report
Start request
End report
(Transfer Gap)
(Transfer Gap)
(Transfer Gap)
BC+1
TC+1BC+1
BC+1
BC+1
TC+1BC+1
BC+1