Transcend Information 400X I/O Transfer Function, TS16G~64GCF400, Transcend Information Inc

TS16G~64GCF400 400X CompactFlash Card

I/O Transfer Function

The I/O transfer to or from the CompactFlash Storage can be either 8 or 16 bits. When a 16 bit accessible port is addressed, the signal -IOIS16 is asserted by the CompactFlash Storage. Otherwise, the -IOIS16 signal is de-asserted. When a 16 bit transfer is attempted, and the -IOIS16 signal is not asserted by the CompactFlash Storage, the system shall generate a pair of 8 bit references to access the word‘s even byte and odd byte. The CompactFlash Storage Card permits both 8 and 16 bit accesses to all of its I/O addresses, so -IOIS16 is asserted for all addresses to which the CompactFlash Storage responds. The CompactFlash Storage Card may request the host to extend the length of an input cycle until data is ready by asserting the -WAIT signal at the start of the cycle.

Table: PCMCIA Mode I/O Function

Function Code

Standby Mode

UDMA Write

UDMA Read

Byte Input Access (8 bits)

Byte Output Access (8 bits)

Word Input Access (16 bits)

Word Output Access (16 bits)

I/O Read Inhibit

I/O Write Inhibit

High Byte Input Only (8 bits)

High Byte Output Only (8 bits)

DMA CMD

No

Write Read

X

X

X

X

X

X

X

X

-REG	-CE2	-CE1	A0	-HIOE	-HIOW	D15-D8
X	H	H	X	X	X	High Z
H	H	H	X	X	X	Odd Byte
H	H	H	X	X	X	Odd Byte
L	H	L	L	L	H	High Z
L	H	L	H	L	H	High Z
L	H	L	L	H	L	Don’t Care
L	H	L	H	H	L	Don’t Care
L	L	L	L	L	H	Odd-Byte
L	L	L	L	H	L	Odd-Byte
H	X	X	X	L	H	Don’t Care
H	X	X	X	H	L	High Z
L	L	H	X	L	H	Odd-Byte
L	L	H	X	H	L	Odd-Byte

D7-D0

High Z

Even Byte

Even Byte

Even-Byte Odd-Byte

Even-Byte Odd-Byte

Even-Byte

Even-Byte

Don’t Care

High Z

High Z

Don’t Care

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