UM10503
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User manual
Rev. 1.3 — 6 July 2012
435 of 1269
NXP Semiconductors
UM10503
Chapter 20: LPC43xx SD/MMC interface
20.6.29 Descriptor List Base Address Register (DBADDR)
20.6.30 Internal DMAC Status Register (IDSTS)
Table 325. Descriptor List Base Address Register (DBADDR, address 0x4000 4088) bit
description
Bit
Symbol
Description
Reset
value
31:0
SDL
Start of Descriptor List. Contains the base address of the First
Descriptor. The LSB bits [1:0] are ignored and taken as all-zero
by the SD/MMC DMA internally. Hence these LSB bits are
read-only.
0
Table 326. Internal DMAC Status Register (IDSTS, address 0x4000 408C) bit description
Bit
Symbol
Description
Reset
value
0
TI
Transmit Interrupt. Indicates that data transmission is finished for a
descriptor. Writing a 1 clears this bit.
0
1
RI
Receive Interrupt. Indicates the completion of data reception for a
descriptor. Writing a 1 clears this bit.
0
2
FBE
Fatal Bus Error Interrupt. Indicates that a Bus Error occurred
(IDSTS[12:10]). When this bit is set, the DMA disables all its bus
accesses. Writing a 1 clears this bit.
0
3
-
Reserved
4
DU
Descriptor Unavailable Interrupt. This bit is set when the descriptor
is unavailable due to OWN bit = 0 (DES0[31] =0). Writing a 1 clears
this bit.
0
5
CES
Card Error Summary. Indicates the status of the transaction to/from
the card; also present in RINTSTS. Indicates the logical OR of the
following bits:
EBE - End Bit Error
RTO - Response Time-out/Boot Ack Time-out
RCRC - Response CRC
SBE - Start Bit Error
DRTO - Data Read Time-out/BDS time-out
DCRC - Data CRC for Receive
RE - Response Error
Writing a 1 clears this bit.
0
7:6
-
Reserved
8
NIS
Normal Interrupt Summary. Logical OR of the following: IDSTS[0] -
Transmit Interrupt IDSTS[1] - Receive Interrupt Only unmasked bits
affect this bit. This is a sticky bit and must be cleared each time a
corresponding bit that causes NIS to be set is cleared. Writing a 1
clears this bit.
0
9
AIS
Abnormal Interrupt Summary. Logical OR of the following: IDSTS[2]
- Fatal Bus Interrupt IDSTS[4] - DU bit Interrupt IDSTS[5] - Card
Error Summary Interrupt Only unmasked bits affect this bit. This is a
sticky bit and must be cleared each time a corresponding bit that
causes AIS to be set is cleared. Writing a 1 clears this bit.
0