EasyManuals Logo

Texas Instruments AM335 Series Technical Reference Manual

Texas Instruments AM335 Series
4161 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #3378 background imageLoading...
Page #3378 background image
Data Sampling
clk
cmd, dat[x:0]
(Host Card)®
cmd, dat[x:0]
(Host Card)¬
tMOS
tMOH
Valid OUT
tMIS
tCP
tC2
tC1
tMiH
Valid IN
Functional Description
www.ti.com
18.3.12 Output Signals Generation
The MMC/SD/SDIO output signals can be driven on either falling edge or rising edge depending on the
SD_HCTL[2] HSPE bit. This feature allows to reach better timing performance, and thus to increase data
transfer frequency.
18.3.12.1 Generation on Falling Edge of MMC Clock
The controller is by default in this mode to maximize hold timings. In this case, SD_HCTL[2] HSPE bit is
cleared to 0.
Figure 18-29 shows the output signals of the module when generating from the falling edge of the MMC
clock.
Figure 18-29. Output Driven on Falling Edge
18.3.12.2 Generation on Rising Edge of MMC Clock
This mode increases setup timings and allows reaching higher bus frequency. This feature is activated by
setting SD_HCTL[2] HSPE bit to 1. The controller shall be set in this mode to support SDR transfers.
NOTE: Do not use this feature in Dual Data Rate mode (when SD_CON[19] DDR is set to 1).
Figure 18-30 shows the output signals of the module when generating from the rising edge of the MMC
clock.
3378
Multimedia Card (MMC) SPRUH73HOctober 2011Revised April 2013
Submit Documentation Feedback
Copyright © 2011–2013, Texas Instruments Incorporated

Table of Contents

Other manuals for Texas Instruments AM335 Series

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Texas Instruments AM335 Series and is the answer not in the manual?

Texas Instruments AM335 Series Specifications

General IconGeneral
BrandTexas Instruments
ModelAM335 Series
CategoryComputer Hardware
LanguageEnglish

Related product manuals