UM10503
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
426 of 1269
NXP Semiconductors
UM10503
Chapter 20: LPC43xx SD/MMC interface
20.6.13 Response Register 0 (RESP0)
23
CCS_EXPECTED
CCS expected. If the command expects Command Completion Signal
(CCS) from the CE-ATA device, the software should set this control
bit. The SD/MMC controller sets the Data Transfer Over (DTO) bit in
the RINTSTS register and generates an interrupt to the host if the
Data Transfer Over interrupt is not masked.
0
0
Interrupts are not enabled in CE-ATA device (nIEN = 1 in ATA control
register), or command does not expect CCS from device.
1
Interrupts are enabled in CE-ATA device (nIEN = 0), and RW_BLK
command expects command completion signal from CE-ATA device.
24
ENABLE_BOOT
Enable Boot - this bit should be set only for mandatory boot mode.
When Software sets this bit along with start_cmd, CIU starts the boot
sequence for the corresponding card by asserting the CMD line low.
Do NOT set disable_boot and enable_boot together.
0
25
EXPECT_BOOT_ACK
Expect Boot Acknowledge. When Software sets this bit along with
enable_boot, CIU expects a boot acknowledge start pattern of 0-1-0
from the selected card.
0
26
DISABLE_BOOT
Disable Boot. When software sets this bit along with start_cmd, CIU
terminates the boot operation. Do NOT set disable_boot and
enable_boot together.
0
27
BOOT_MODE
Boot Mode
0
0
Mandatory Boot operation
1
Alternate Boot operation
28
VOLT_SWITCH
Voltage switch bit
0
0
No voltage switching
1
Voltage switching enabled; must be set for CMD11 only
30:29
-
Reserved
31
START_CMD
Start command. Once command is taken by CIU, this bit is cleared.
When bit is set, host should not attempt to write to any command
registers. If write is attempted, hardware lock error is set in raw
interrupt register. Once command is sent and response is received
from SD_MMC_CEATA cards, Command Done bit is set in the raw
interrupt register.
Table 308. Command Register (CMD, address 0x4000 402C) bit description
Bit
Symbol
Value
Description
Reset
value
Table 309. Response Register 0 (RESP0, address 0x4000 4030) bit description
Bit
Symbol
Description
Reset
value
31:0
RESPONSE0
Bit[31:0] of response
0