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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
415 of 1269
NXP Semiconductors
UM10503
Chapter 20: LPC43xx SD/MMC interface
•
Bus Interface Unit (BIU) - Provides AHB and DMA interfaces for register and data
read/writes.
•
Card Interface Unit (CIU) - Handles the card protocols and provides clock
management.
•
Internal MCI DMA controller: AHB bus mastering DMA controller
20.5 Pin description
Fig 45. SD/MMC block diagram
Registers
FIFO
Control
DMA
Interface
Control
BIU
Clock
Control
FIFO
RAM
Interrupts
,
status
APB/AHB
Slave
Synch
roniz
e
r
Output H
o
ld Register
Card
Socket
Regulators
Power
Switches
cclk
ccmd
cdata
Write
Protect
Card
Detect
cclk_in_drv
cclk_in_sample
cclk_in
Host
Interface
Unit
SDIO
Interrupt
Control
CIU
Power,
Pullup,
Card Detect,
& Debounce
Control
Interrupt
Control
Input Sample Register
Note: The card_detect and write-protect signals are from the
SD/MMC card socket and not from the SD/MMC card.
Internal
DMA
Controller
Interface
AHB
Master
Interface
MUX/
De-Mux
Unit
Command
Control
Path
Data
Path
Control
CLK_M4_SDIO
Table 295. SDIO pin description
Pin function
Direction Description
SD_CLK
O
SD/SDIO/MMC clock
SD_CD
I
SDIO card detect for single slot
SD_WP
I
SDIO card write protect
SD_LED
O
LED On signal. This signal cautions the user not to remove
the SD card while it is accessed.
SD_CMD
I/O
Command input/output
SD_D[7:0]
I/O
Data input/output for data lines DAT[7:0]