Infineon Technologies TC1796 - Page 749

TC1796
System Units (Vol. 1 of 2)
Direct Memory Access Controller
User’s Manual 12-85 V2.0, 2007-07
DMA, V2.0
CBLS [11:8] rw Circular Buffer Length Source
This bit field determines which part of the 32-bit source
address register remains unchanged and is not updated
after a DMA move operation (see also Page 12-19).
Therefore, CBLS also determines the size of the circular
source buffer.
0000
B
Source address SADR[31:0] is not updated.
0001
B
Source address SADR[31:1] is not updated.
0010
B
Source address SADR[31:2] is not updated.
0011
B
Source address SADR [31:3] is not updated.
…
B
…
1110
B
Source address SADR[31:14] is not updated.
1111
B
Source address SADR[31:15] is not updated.
CBLD [15:12] rw Circular Buffer Length Destination
This bit field determines which part of the 32-bit
destination address register remains unchanged and is
not updated after a DMA move operation (see also
Page 12-19). Therefore, CBLD also determines the size
of the circular destination buffer.
0000
B
Destination address DADR[31:0] is not
updated.
0001
B
Destination address DADR[31:1] is not
updated.
0010
B
Destination address DADR[31:2] is not
updated.
0011
B
Destination address DADR [31:3] is not
updated.
…
B
…
1110
B
Destination address DADR[31:14] is not
updated.
1111
B
Destination address DADR[31:15] is not
updated.
Field Bits Type Description