Cypress EZ-OTG CY7C67200 - Manual (Page 52)

CY7C67200
Document #: 38-08014 Rev. *G Page 52 of 78
HPI Status Port [] [HPI: R]
Figure 60. HPI Status Port
Register Description
The HPI Status Port provides the external host processor with
the MailBox status bits plus several SIE status bits. This
register is not accessible from the on-chip CPU. The additional
SIE status bits are provided to aid external device driver
firmware development, and are not recommended for applica-
tions that do not have an intimate relationship with the on-chip
BIOS.
Reading from the HPI Status Port does not result in a CPU HPI
interface memory access cycle. The external host may contin-
uously poll this register without degrading the CPU or DMA
performance.
VBUS Flag (Bit 15)
The VBUS Flag bit is a read-only bit that 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.
1: OTG VBus is greater then 4.4V
0: OTG VBus is less then 4.4V
ID Flag (Bit 14)
The ID Flag bit is a read-only bit that indicates the state of the
OTG ID pin.
SOF/EOP2 Flag (Bit 12)
The SOF/EOP2 Flag bit is a read-only bit that indicates if a
SOF/EOP interrupt occurs on either Host/Device 2.
1: Interrupt triggered
0: Interrupt did not trigger
SOF/EOP1 Flag (Bit 10)
The SOF/EOP1 Flag bit is a read-only bit that indicates if a
SOF/EOP interrupt occurs on either Host/Device 1.
1: Interrupt triggered
0: Interrupt did not trigger
Reset2 Flag (Bit 9)
The Reset2 Flag bit is a read-only bit that indicates if a USB
Reset interrupt occurs on either Host/Device 2.
1: Interrupt triggered
0: Interrupt did not trigger
Mailbox In Flag (Bit 8)
The Mailbox In Flag bit is a read-only bit that indicates if a
message is ready in the incoming mailbox. This interrupt
clears when on-chip CPU reads from the HPI Mailbox register.
1: Interrupt triggered
0: Interrupt did not trigger
Resume2 Flag (Bit 7)
The Resume2 Flag bit is a read-only bit that indicates if a USB
resume interrupt occurs on either Host/Device 2.
1: Interrupt triggered
0: Interrupt did not trigger
Resume1 Flag (Bit 6)
The Resume1 Flag bit is a read-only bit that indicates if a USB
resume interrupt occurs on either Host/Device 1.
1: Interrupt triggered
0: Interrupt did not trigger
SIE2msg (Bit 5)
The SIE2msg Flag bit is a read-only bit that indicates if the
CY7C67200 CPU has written to the SIE2msg register. This bit
is cleared on an HPI read.
1: The SIE2msg register has been written by the CY7C67200
CPU
0: The SIE2msg register has not been written by the
CY7C67200 CPU
SIE1msg (Bit 4)
The SIE1msg Flag bit is a read-only bit that indicates if the
CY7C67200 CPU has written to the SIE1msg register. This bit
is cleared on an HPI read.
1: The SIE1msg register has been written by the CY7C67200
CPU
0: The SIE1msg register has not been written by the
CY7C67200 CPU
Done2 Flag (Bit 3)
In host mode the Done2 Flag bit is a read-only bit that indicates
if a host packet done interrupt occurs on Host 2. In device
Bit # 15 14 13 12 11 10 9 8
Field
VBUS
Flag
ID
Flag
Reserved SOF/EOP2
Flag
Reserved SOF/EOP1
Flag
Reset2
Flag
Mailbox In
Flag
Read/Write R R - R - R R R
Default X X X X X X X X
Bit # 7 6 5 4 3 2 1 0
Field
Resume2
Flag
Resume1
Flag
SIE2msg SIE1msg Done2
Flag
Done1
Flag
Reset1
Flag
Mailbox Out
Flag
Read/Write R R R R R R R R
Default X X X X X X X X
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