IIR
Interrupt Identification Register
| Module Instance | Base Address | Register Address |
|---|---|---|
| i_uart_0_uart_address_block | 0xFFC02000 | 0xFFC02008 |
| i_uart_1_uart_address_block | 0xFFC02100 | 0xFFC02108 |
Size: 32
Offset: 0x8
Access: RO
Important: The value of a reserved bit must be maintained in software. When you modify registers containing reserved bit fields, you must use a read-modify-write operation to preserve state and prevent indeterminate system behavior.
| Bit Fields | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
|
RSVD_IIR_31to8 RO 0x0 |
|||||||||||||||
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|
RSVD_IIR_31to8 RO 0x0 |
FIFOSE RO 0x0 |
RSVD_IIR_5to4 RO 0x0 |
IID RO 0x1 |
||||||||||||
IIR Fields
| Bit | Name | Description | Access | Reset | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 31:8 | RSVD_IIR_31to8 |
Reserved bits [31:8] - Read Only |
RO | 0x0 | ||||||||||||||||
| 7:6 | FIFOSE |
Bits[7:6], FIFO's Enabled (or FIFOSE): This is used to indicate whether the FIFO's are enabled or disabled. 00 = disabled. 11 = enabled
|
RO | 0x0 | ||||||||||||||||
| 5:4 | RSVD_IIR_5to4 |
Reserved bits [5:4] - Read Only |
RO | 0x0 | ||||||||||||||||
| 3:0 | IID |
Bits[3:0], Interrupt ID (or IID): This indicates the highest priority pending interrupt which can be one of the following types: 0000 = modem status. 0001 = no interrupt pending. 0010 = THR empty. 0100 = received data available. 0110 = receiver line status. 0111 = busy detect. 1100 = character timeout. Note, an interrupt of type 0111 (busy detect) will never get indicated if UART_16550_COMPATIBLE == YES in coreConsultant.
|
RO | 0x1 |