Cypress Semiconductor EZ-Host CY7C67300 User Manual download pdf (Page 83)

CY7C6730

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7.11.3 SIEXmsg Register [W]

• SIE1msg Register 0x0144

• SIE2msg Register 0x0148

Figure 7-68. SIEXmsg Register

The SIEXmsg Register allows an interrupt to be generated on the HPI port. Any write to this register will cause the SIEXmsg flag

in the HPI Status Port to go high and will also cause an interrupt on the HPI_INTR pin. The SIEXmsg flag is automatically cleared

when the HPI port reads from this register.

Data (Bits [15:0])

The Data field[15:0] simply needs to have any value written to it to cause SIExmsg flag in the HPI Status Port to go high.

7.11.4 HPI Mailbox Register [0xC0C6] [R/W]

Figure 7-69. HPI Mailbox Register

The HPI Mailbox Register provides a common mailbox between the CY7C67300 and the external host processor.

If enabled, the HPI Mailbox RX Full interrupt will trigger when the external host processor writes to this register. When the

CY7C67300 reads this register the HPI Mailbox RX Full interrupt will automatically get cleared.

If enabled, the HPI Mailbox TX Empty interrupt will trigger when the external host processor reads from this register. The HPI

Mailbox TX Empty interrupt will automatically clear when the CY7C67300 writes to this register.

In addition, when the CY7C67300 writes to this register, the HPI_INTR signal on the HPI port will assert signaling the external

processor that there is data in the mailbox to read. The HPI_INTR signal will de-assert when the external host processor reads

from this register.

Message (Bits [15:0])

The Message field contains the message that the host processor wrote to the HPI Mailbox Register.

Bit # 15 14 13 12 11 10 9 8

Field Data...

Read/Write W W W W W W W W

Default X X X X X X X X

Bit # 7 6 5 4 3 2 1 0

Field ...Data

Read/Write W W W W W W W W

Default X X X X X X X X

Bit # 15 14 13 12 11 10 9 8

Field Message...

Read/Write R/W R/W R/W R/W 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 ...Message

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Default 0 0 0 0 0 0 0 0

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 119 120

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Cypress Semiconductor EZ-Host CY7C67300 User Manual Page 83