SDI Technologies SDIO Card manual Card initialization flow in SD mode Sdio aware host

SDIO Simplified Specification Version 2.00		©Copyright 2000-2007 SD Card Association
	A	B
	Test MEM Flag	Skip memory initialize or MEM=1
Execute memory initialize & MEM=0
	ACMD41 Arg=0	Get memory OCR
No Response	Check Response	OCR invalid

OCR valid

Set New Voltage (if needed)

High Capacity Support Host: HCS=1

ACMD41 Arg=HCS, WV

	MRDY=0		Check Response			1sec Timeout
	No Response			MRDY=1
	Unusable card			MEM=1	Memory Initialized
	(Inactive State)				If F8=1, CCS is valid
				CMD2
							IO=1
				CMD3
				Test Flags
		IO=0, MEM=1		IO=1,IO=1, MEM=0
				MEM=1
Not SD	Test CCS			IO Only		Test CCS
Card				Card
	CCS=0	CCS=1			CCS=0		CCS=1

Test IO Flag

IO=0

CMD15 RCA=0

Unusable card (Inactive State)

Standard	High	Standard	High
Capacity	Capacity	Capacity	Capacity
Memory	Memory	Combo	Combo
Only Card	Only Card	Card	Card

Variables
NF:	Number of I/O Functions (CMD5 Response)
MP:	Memory Present Flag (CMD5 Response)
IORDY:	I/O Power-up Status (C bit in the CMD5 response)
MRDY:	Memory Power-up Status (OCR Bit31)
HCS:	Host Capacity Support (ACMD41 Argument)

CCS:	Card Capacity Status (ACMD41 Response)
Flags
IO:	I/O Functions Initialized Flag
MEM:	Memory Initialized Flag
F8:	CMD8 Flag

Figure 3-2 Card initialization flow in SD mode (SDIO aware host)

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