XMC-6VLX
USER’S MANUAL
Acromag, Inc. Tel: 248-295-0310
- 29 - http://www.acromag.com
- 29 -
www.acromag.com
CDMA Current Descriptor Pointer Register (Read/Write) - (BAR0 + 0x000A0008)
This register provides the Current Descriptor Pointer for the AXI CDMA
Scatter Gather Descriptor Management.
Table 3.11:
CDMA Current
Descriptor Pointer Register
Bit(s)
FUNCTION
5-0
Writing to these bits has no effect and they are always read
as zeros.
31-6
Current Descriptor Pointer. This register field is written by the
software application (in Scatter Gather Mode) to set the
starting address of the first transfer descriptor to execute for
a Scatter Gather operation. The address written corresponds
to a 32-bit system address with the least significant 6 bits
truncated. This register field must contain a valid descriptor
address prior to the software application writing the CDMA
Tail Descriptor Pointer register value. Failure to do so results
in an undefined operation by the CDMA.
On error detection, the Current Descriptor Pointer register is
updated to reflect the descriptor associated with the detected
error.
Note:
The register should only be written by the Software
application when the AXI CDMA is Idle.