SDI Technologies SDIO Card Benutzerhandbuch

 

 

 

©Copyright 2000-2007 SD Card Association  

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The Common I/O Area (CIA) shall be implemented on all SDIO cards. The CIA is accessed by the host via I/O 
reads and writes to function 0. The registers within the CIA are provided to enable/disable the operation of the 
I/O function(s), control the generation of interrupts and optionally load software to support the I/O functions. The 
registers in the CIA also provide information about the function(s) abilities and requirements. There are three 
distinct register structures supported within the CIA. They are: 
 

1.  Card Common Control Registers (CCCR) 
2.  Function Basic Registers (FBR) 
3.  Card Information Structure (CIS) 

 

 
The Card Common Control Registers allow for quick host checking and control of an I/O card’s enable and 
interrupts on a per card (master) and per function basis. The bits in the CCCR are mixed Read/Write and read 
only. If any of the possible 7 functions are not provided on an SDIO card, the bits corresponding to unused 
functions shall all be read-only and read as 0. All reserved for future use bits (RFU) shall be read-only and return 
a value of 0. All writeable bits are set to 0 after power-up or reset. Access to the CCCR is possible even after 
initialization when the I/O functions are disabled. Access is performed using the I/O read and write commands 
defined in section 5. This allows the host to enable functions after initialization. The CCCR is organized as 
follows: 

CCCR

0x000300-0x0003FF

FBR (Function 1)

0x000100-0x0001FF

FBR (Function 2)

FBR (Function 3)

FBR (Function 7)

0x000200-0x0002FF

0x000000-0x0000FF

0x000700-0x0007FF

CIS Area

(common and per-function)

RFU

0x001000-0x017FFF

0x018000-0x01FFFF

X

X

16 MB optional

Code Storage

Area

(CSA)

CIS Pointers

Window

Window

Window

Window

CIA (Function 0)

Function Unique

128K Register Space

(function 1-7)

0x000000-0x01FFFF

RFU

0x000800-0x000FFF