Cypress CY7C67200 Vbus Valid Flag Bit, Gpio Registers Register Name Address, SAS Enable Bit

CY7C67200

VBUS Valid Flag (Bit 0)

The VBUS Valid Flag bit indicates whether OTG VBus is greater than 4.4V. After turning on VBUS, firmware should wait at least 10 µs before this reading this bit.

GPIO Registers

1:OTG VBus is greater then 4.4V

0:OTG VBus is less then 4.4V

Reserved

All reserved bits must be written as ‘0’.

There are seven registers dedicated for GPIO operations. These seven registers are covered in this section and summarized in Table 29.

Table 29.GPIO Registers

	Register Name				Address			R/W
GPIO Control Register					0xC006			R/W
GPIO0 Output Data Register					0xC01E			R/W
GPIO0 Input Data Register					0xC020				R
GPIO0 Direction Register					0xC022			R/W
GPIO1 Output Data Register					0xC024			R/W
GPIO1 Input Data Register					0xC026				R
GPIO1 Direction Register					0xC028			R/W
GPIO Control Register [0xC006] [R/W]
			Figure 41. GPIO Control Register
Bit #	15	14	13	12	11	10	9		8
Field	Write Protect	Reserved	Reserved		SAS			Mode
	Enable				Enable			Select
Read/Write	R/W	-	R	-	R/W	R/W		R/W	R/W
Default	0	0	0	0	0	0	0		0
Bit #	7	6	5	4	3	2	1		0
Field	HSS	Reserved	SPI		Reserved			Interrupt 0	Interrupt 0
	Enable		Enable				Polarity Select		Enable
Read/Write	R/W	-	R/W	-	-	-		R/W	R/W
Default	0	0	0	0	0	0	0		0

Register Description

The GPIO Control register configures the GPIO pins for various interface options. It also controls the polarity of the GPIO interrupt on IRQ0 (GPIO24).

Write Protect Enable (Bit 15)

The Write Protect Enable bit enables or disables the GPIO write protect. When Write Protect is enabled, the GPIO Mode Select [15:8] bits are read-only until a chip reset.

1:Enable Write Protect

0:Disable Write Protect

SAS Enable (Bit 11)

The SAS Enable bit, when in SPI mode, reroutes the SPI port SPI_nSSI pin to GPIO[15] rather then GPIO[9].

1:Reroute SPI_nss to GPIO[15]

0:Leave SPI_nss on GPIO[9]

Mode Select (Bits [10:8])

The Mode Select field selects how GPIO[15:0] and GPIO[24:19] are used as defined in Table 30.

Table 30.Mode Select Definition

Mode Select	GPIO Configuration
[10:8]
111	Reserved

110SCAN – (HW) Scan diagnostic. For produc- tion test only. Not for normal operation

101HPI – Host Port Interface

100Reserved

011Reserved

010Reserved

001Reserved

000GPIO – General Purpose Input Output

Document #: 38-08014 Rev. *G Page 40 of 78

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