Maxim Integrated MAX32660 - Page 193

MAX32660 User Guide
Maxim Integrated Page 193 of 195
SPIMSS DMA Register
SPIMSS_DMA
[0x0018]
Bits
Name
Access
Reset
Description
27:24
rx_fifo_cnt
R/W
0
Receive FIFO Count
0b0000: RX FIFO empty (0 entries)
0b0001: RX FIFO contains 1 entry
0b0010: RX FIFO contains 2 entries
0b0011: RX FIFO contains 3 entries

0b1000: RX FIFO contains 15 entries
23:21
-
R/W
0
Reserved for Future Use
Do not modify this field.
20
rx_fifo_clr
R/W
0
Receive FIFO Clear
Write 1 to reset the Receive FIFO. Writing 0 has no effect.
0: Ignored
1: Reset Receive FIFO
19
-
R/W
0
Reserved for Future Use
Do not modify this field.
18:16
rx_fifo_lvl
R/W
0
Receive FIFO Level
Sets the RX FIFO DMA request threshold. This configures the number of filled RX
FIFO entries before activating an RX DMA request.
000: Request Receive DMA when RX FIFO contains 1 entry
001: Request Receive DMA when RX FIFO contains 2 entries
010: Request Receive DMA when RX FIFO contains 3 entries

111: Request Receive DMA when RX FIFO contains 8 entries
15
tx_dma_en
R/W
0
Transmit DMA Enable
Disabling clears any active request to the DMA controller.
0: Disable TX DMA requests
1: Enable TX DMA requests
14:12
-
R/W
0
Reserved for Future Use
Do not modify this field.
11:8
tx_fifo_cnt
R/W
0
Transmit FIFO Count
0b0000: TX FIFO empty (0 entries)
0b0001: TX FIFO contains 1 entry
0b0010: TX FIFO contains 2 entries
0b0011: TX FIFO contains 3 entries

0b1000: TX FIFO contains 15 entries
7:5
-
R/W
0
Reserved for Future Use
Do not modify this field.
4
tx_fifo_clr
R/W
0
Transmit FIFO Clear
Write 1 to reset the Receive FIFO. Writing 0 has no effect.
0: Ignored
1: Reset Receive FIFO
3
-
R/W
0
Reserved for Future Use
Do not modify this field.