UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
560 of 1441
NXP Semiconductors
UM10503
Chapter 22: LPC43xx/LPC43Sxx SD/MMC interface
22.6.21 Card Detect Register
22.6.22 Write Protect Register
30:28
DMA_MTS
Burst size of multiple transaction; should be programmed same as
DW-DMA controller multiple-transaction-size SRC/DEST_MSIZE.The
units for transfers is the H_DATA_WIDTH parameter. A single transfer
(dw_dma_single assertion in case of Non DW DMA interface) would
be signalled based on this value. Value should be sub-multiple of
(RX 1) and (32 - TX_WMark).
For example, if FIFO_DEPTH = 16, FDATA_WIDTH =
H_DATA_WIDTH
Allowed combinations for MSize and TX_WMark are:
MSize = 1, TX_WMARK = 1-15
MSize = 4, TX_WMark = 8
MSize = 4, TX_WMark = 4
MSize = 4, TX_WMark = 12
MSize = 8, TX_WMark = 8
MSize = 8, TX_WMark = 4.
Allowed combinations for MSize and RX_WMark are:
MSize = 1, RX_WMARK = 0-14
MSize = 4, RX_WMark = 3
MSize = 4, RX_WMark = 7
MSize = 4, RX_WMark = 11
MSize = 8, RX_WMark = 7
MSize = 8, RX_WMark = 11
Recommended: MSize = 8, TX_WMark = 8, RX_WMark = 7
0
0x0
1 transfer
0x1
4 transfers
0x2
8 transfers
0x3
16 transfers
0x4
32 transfers
0x5
64 transfers
0x6
128 transfers
0x7
256 transfers
31
-
Reserved
0
Table 377. FIFO Threshold Watermark Register (FIFOTH, address 0x4000 404C) bit description
Bit
Symbol
Value
Description
Reset
value
Table 378. Card Detect Register (CDETECT, address 0x4000 4050) bit description
Bit
Symbol
Description
Reset
value
0
CARD_DETECT
Card detect. 0 represents presence of card.
0
31:1
-
Reserved
-
Table 379. Write Protect Register (WRTPRT, address 0x4000 4054) bit description
Bit
Symbol
Description
Reset
value
0
WRITE_PROTECT
Write protect. 1 represents write protection.
0
31:1
-
Reserved
-