Cypress FM4 Series - Page 495

CHAPTER 10: DMAC
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 495
[bit29] ST : Software Trigger
This bit is used to generate a software transfer request for an individual channel.
When this bit is set to "1", a trigger is generated by the software transfer request and the relevant channel
starts its transfer. After the completion of the transfer, DMAC clears this bit to "0".
When this bit is set to "0" during the transfer, the transfer stops.
bit
Function
0
No software transfer request (Initial value)
1
Software transfer request available
[bit28:23] IS[5:0] : Input Select
These bits select the trigger for transfer requests.
When the transfer trigger is set to software request (ST=1), set the IS[5:0] bits to "000000".
When the transfer trigger is set to hardware request, specify which Peripheral’s interrupt signal to be used
to start transfer. Any Peripheral can be selected for all of the channels.
The hardware transfer request signal to be connected to DMAC varies depending on the product used.
Check the transfer request signal to be connected in "2.2 I/O Signals of DMAC" before setting the
selection.
bit28:23
Function
000000
Software (Initial value)
100000
IDREQ[0]
100001
IDREQ[1]
100010
IDREQ[2]
100011
IDREQ[3]
100100
IDREQ[4]
100101
IDREQ[5]
100110
IDREQ[6]
100111
IDREQ[7]
101000
IDREQ[8]
101001
IDREQ[9]
101010
IDREQ[10]
101011
IDREQ[11]
101100
IDREQ[12]
101101
IDREQ[13]
101110
IDREQ[14]
101111
IDREQ[15]
110000
IDREQ[16]
110001
IDREQ[17]
110010
IDREQ[18]
110011
IDREQ[19]
110100
IDREQ[20]
110101
IDREQ[21]
110110
IDREQ[22]
110111
IDREQ[23]
111000
IDREQ[24]
111001
IDREQ[25]
111010
IDREQ[26]