Silicon Image SSD-P08G(I)-3521 manual Common Memory Description and Operation

COMMON MEMORY DESCRIPTION AND OPERATION SSD-PXXX(I)-3521 DATA SHEET

COMMON MEMORY DESCRIPTION AND OPERATION

Common memory space can be accessed when the SiliconDrive is configured in memory-mapped mode.

COMMON MEMORY READ OPERATIONS

Common memory read operations are issued by asserting CE1#, CE2#, or both, and OE# low, REG#, and WE# must be inactive.

Table 26: Common Memory Read Operations

Function Mode	REG#	CE1#	CE2#	A0	OE#	WE#	D[15:8]	D[7:0]
Standby	X	H	H	X	X	X	High-Z	High-Z
Byte Access	H	L	H	L	L	H	High-Z	Even
	H	L	H	H	L	H	High-Z	Odd
Word Access	H	L	L	X	L	H	Odd	Even
Odd Byte Only	H	H	L	X	L	H	Odd	High-Z
Access

COMMON MEMORY WRITE OPERATIONS

Common memory write operations are issued by asserting CE1#, CE2#, or both, and WE# low, REG#, and OE# must be inactive.

Table 27: Common Memory Write Operations

Function Mode	REG#	CE1#	CE2#	A0	OE#	WE#	D[15:8]	D[7:0]
Standby	X	H	H	X	X	X	High-Z	High-Z
Byte Access	H	L	H	L	H	L	High-Z	Even
	H	L	H	H	H	L	High-Z	Odd
Word Access	H	L	L	X	H	L	Odd	Even
Odd Byte Only	H	H	L	X	H	L	Odd	High-Z
Access

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3521P-02DSR PAGE 41 FEBRUARY 2, 2009