cmd
Command
Response
Block read operation
Host to
card
Card to
host
Card to
host
Multiple block read operation
Data block + CRC
Data block + CRC
mmchs-059
dat[3:0]
t1
t2
t3
t4
mmchs-060
clk
cmd
CMD0
*
CMD0/reset
CMD1
CMD2
CMD3
RESP
RESP
RESP
dat0
S
S
S
E
E
E
010
512 bytes
+ CRC
512 bytes
+ CRC
1 sec. max
50ms max
Min. 74 clocks
required after
power is stable
to start boot
command
* Refer to MMC specification for correct argument.
t1
t2
t3
t4
t5 t6
Public Version
MMC/SD/SDIO Functional Description
www.ti.com
Figure 24-26. Read Data Timeout
t1 - Data timeout counter is loaded and starts after Command transmission.
t2 - Data timeout counter stops and if it is 0,
[21] DCRC is generated.
t3 - Data timeout counter is loaded and starts after Data block + CRC transmission.
t4 - Data timeout counter stops and if it is 0,
[21] DCRC is generated.
24.4.5.5 Boot Acknowledge Timeout
shows DCRC event condition asserted when there is boot acknoledge timeout and CMD0 is
used.
Figure 24-27. Boot Acknowledge Timeout When Using CMD0
t1 - Data timeout counter is loaded and starts after CMD0.
t2 - Data timeout counter stops and if it is 0,
[21] DCRC is generated.
t3 - Data timeout counter is loaded and starts.
t4 - Data timeout counter stops and if it is 0,
[21] DCRC is generated.
t5 - Data timeout counter is loaded and starts after Data + CRC transmission.
t6 - Data timeout counter stops and if it is 0,
[21] DCRC is generated.
shows DCRC event condition asserted when there is boot acknoledge timeout and CMD0 is
used.
3392
MMC/SD/SDIO Card Interface
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
Страница 174: ...174 List of Tables SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 692: ...692 MPU Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1084: ...1084 IVA2 2 Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1990: ...1990 2D 3D Graphics Accelerator SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2334: ...2334 Memory Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2700: ...2700 Memory Management Units SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2868: ...2868 HDQ 1 Wire SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2974: ...2974 UART IrDA CIR SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3054: ...3054 Multichannel SPI SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3462: ...3462 MMC SD SDIO Card Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3508: ...3508 General Purpose Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3584: ...3584 Initialization SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3648: ...3648 Debug and Emulation SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...