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PRELIMINARY
Table 6-13 describes signals capable of
generating a system interrupt and lists their
corresponding bits. The bits are the same for
synchronous and asynchronous interrupts.
Table 6-13. System Interrupt Registers: Bit Descriptions
Bit
Name
31:18
17
16
15
14
13
12:7
6
RES
MAC_SLEEP_ACCESS
MAC_ASLEEP
MAC_AWAKE
PM_ACCESS
LOCAL_TIMEOUT
RES
INVALID_ADDRESS
_ACCESS
5
4
3
2
1
0
6.15.5
Description
Reserved
Software is trying to access a register within the MAC while it is asleep
The MAC has gone to sleep
The MAC has become awake
The AHB master is requesting a DMA transfer to the core while it is asleep
A local bus timeout has occurred
Reserved
Invalid register access
MAC_TXC_CORRUPTION Tx descriptor integrity flag
_FLAG_SYNC
RES
Reserved
APB_TIMEOUT
No response from one of the AR9331 modules within the programmed
timeout period during a register access
EEPROM_ILLEGAL
Software attempted to either access a protected area within the EEPROM,
_ACCESS
or access the EEPROM while it is busy or absent
MAC_IRQ
The MAC has requested an interrupt
RTC_IRQ
The RTC is in shutdown state
Synchronous Interrupt Cause (HOST_INTF_INTR_SYNC_CAUSE)
Offset: 0x18104028
Access: Read/Write-One-to-Clear
Reset Value: 0000_0000
Bit
Name
Description
31:0
DATA
Any bit set in this register indicates that the corresponding interrupt has been triggered in
synchronous mode; for any bit to be to set in this register, the corresponding bit in the
“Synchronous Interrupt Enable (HOST_INTF_INTR_SYNC_ENABLE)” register
must also be set. See Table 6-13 for bit descriptions.
6.15.6
Synchronous Interrupt Enable (HOST_INTF_INTR_SYNC_ENABLE)
Offset: 0x1810402C
Access: Read/Write
Reset Value: 0000_0000
Bit
Name
Description
31:0
DATA
Setting any bit in this register allows the corresponding interrupt signal to set its
corresponding bit in the “Synchronous Interrupt Cause
(HOST_INTF_INTR_SYNC_CAUSE)” register. See Table 6-13 for bit descriptions.
Atheros Communications, Inc.
COMPANY CONFIDENTIAL
AR9331 802.11n 1x1 2.4 GHz SoC for AP and Router Platforms
December 2010
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