Fujitsu MB91401 manual Prelminary, 2004.11.12, Pin name, Pin no, Function/application

MB91401	Prelminary
	2004.11.12

EXTERNAL IF (23 pin)

Pin name	Pin no.	Polarity	I/O	Circuit	Function/application
EXCSX	50	Nega-	IN	D	External chip select input pin
		tive			Chip select input pin from external host.
					External address input pin
EXA	116		IN	D	Address input pin from external host.
					“0” : Register select
					“1” : FIFO data select
EXD15	180
EXD14	122
EXD13	57				External data input/output pins
EXD12	56	
			I/O	B	The I/O terminal of data bus bit of bit15 to bit8 with an
EXD11	121
					external host.
EXD10	54
EXD9	179
EXD8	120
EXD7/GPIO7	53
EXD6/GPIO6	178				External data/GPIO input/output pins
EXD5/GPIO5	119
					The I/O terminal of data bus bit of bit7 to bit0 with an
EXD4/GPIO4	52	
			I/O	B	external host.
EXD3/GPIO3	228
					Note : When EXIS16 “0” input, it becomes the I/O terminal
EXD2/GPIO2	177
					of GPIO7 to GPIO0.
EXD1/GPIO1	118
EXD0/GPIO0	51
EXRDX	117	Nega-	IN	D	External read strobing input pin
		tive			Read strove input pin from external host
EXWRX	176	Nega-	IN	D	External write strobing input pin
		tive			Write strove input pin from external host
					External data bus width select input pin
					Bit width select pin of EXD
EXIS16	49		IN	D	“0” : 8 bit
					(Note : EXD15 to EXD8 are enabled.)
					“1” : 16 bit
DREQRX	174	Nega-	OUT	F	External reception data request output pin
		tive			Recordable data to reception FIFO is shown.
		Nega-			External transfer data request output pin
DREQTX	175		OUT	F	It is shown that there are data in transmission register and
		tive
					transmission FIFO.

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