UM10430 Datasheet, PDF (306/1164 Pages) NXP Semiconductors – LPC18xx ARM Cortex-M3 microcontroller

UM10430 NXP Semiconductors
18.6.12 Command Register (CMD)
Table 236. Command Register (CMD, address 0x4000 402C)
Bit Symbol
Value Description
5:0 CMD_INDEX
6
RESPONSE_EXPECT
Command index
response expect
bit
Chapter
description
1D8R: ^{ALFPTCDR1A8DFRxTAxDFSTRADDFR/TADMDFRMTRAAFDCTFRTADinDFR}_{00RvTRtDAeaARFDe}r_lTFA_sRufTF_eAaDe^T_{tDFRcTRDAeARDFTFDARTRFADTADFRTFRDATADRF}
0
No response expected from card
1
Response expected from card
7
RESPONSE_ LENGTH
response length
0
0
Short response expected from card
1
Long response expected from card
8
CHECK_RESPONSE_C
RC
check response crc Some of command responses do not return valid 0
CRC bits. Software should disable CRC checks for those commands
in order to disable CRC checking by controller.
0
Do not check response CRC
1
Check response CRC
9
DATA_EXPECTED
data expected
0
0
No data transfer expected (read/write)
1
Data transfer expected (read/write)
10
READ_WRITE
read/write. Don't care if no data expected from card.
0
0
Read from card
1
Data transfer expected (read/write)
11
TRANSFER_MODE
transfer mode. Don't care if no data expected.
0
0
Block data transfer command
1
Stream data transfer command
12
SEND_AUTO_STOP
send auto stop. When set, DWC_mobile_storage sends stop
0
command to SD_MMC_CEATA cards at end of data transfer. Refer to
<tbd> to determine:
- when send_auto_stop bit should be set, since some data transfers
do not need explicit stop commands
- open-ended transfers that software should explicitly send to stop
command
Additionally, when resume is sent to resume - suspended memory
access of SD-Combo card - bit should be set correctly if suspended
data transfer needs send_auto_stop. Don't care if no data expected
from card.
0
No stop command sent at end of data transfer
1
Send stop command at end of data transfer
13
WAIT_PRVDATA_COM
PLETE
wait prvdata complete. The wait_prvdata_complete = 0 option
0
typically used to query status of card during data transfer or to stop
current data transfer; card_number should be same as in previous
command.
0
Send command at once, even if previous data transfer has not
completed.
1
Wait for previous data transfer completion before sending command.
<Document ID>
User manual
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Rev. 00.13 — 20 July 2011
© NXP B.V. 2011. All rights reserved.
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