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NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 907 -
Revision V1.30
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Secure Digital Host Controller (SDH)
5.26
5.26.1 Overview
The Secure-Digital Card Host Controller (SDH) equips DMAC unit and SD unit. The DMAC unit
provides a DMA (Direct Memory Access) function for SD to exchange data between system memory
and shared buffer (128 bytes), and the SD unit controls the interface of SD/SDHC/SDIO. The SDH
controller supports SD/SDHC/SDIO card and cooperates with DMAC to provide a fast data transfer
between system memory and cards.
5.26.2 Features
Supports single DMA channel
Supports hardware Scatter-Gather functionality.
Supports 128 Bytes shared buffer for data exchange between system memory and cards.
Supports SD, SDHC and SDIO card.
5.26.3 Block Diagram
SD Unit
Engine Clock
HCLK
DMAC
Unit
Register
Decoder
DMAC
Controler
128 Byte
FIFO
FIFO
Interface
SD / SDHC
Controller
Sync. Circuit
GPIO
SD_DAT[3:0]
SD_CMD
SD_CLK
SD_CD
AMBA Wrapper (Master / Slave)
AHB Bus
Figure 1. SD Card Host Controller Block Diagram