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TLINTRSUM0–1—Interrupt Source Registers
Address
BB + 1180, BB + 11C0
Access
R/W
The DECchip 21164 has seven interrupt lines. They are as follows:
1. IRQ<3:0> - Interrupt request lines mapping to IPL17:IPL14
2. SYS_MCH_CHK_IRQ - Machine check interrupt request
3. MCH_HLT_IRQ - Machine halt interrupt request
4. PWR_FAIL_IRQ - Power fail interrupt request
Multiple interrupts from different devices may be targeted at the
same interrupt request pin of the CPU. For example, two I/O devices
may request service at IPL14, while an on-module DUART interrupt
may occur at the same time. All these interrupts would be targeted
to the IRQ<0> pin of the CPU.
DECchip 21164 PALcode reads the TLINTRSUM register to deter-
mine the source of any outstanding interrupts.
31
29 28 27 26
22 21
17 16 15 14 13 12
ILP17
IPL16
Ctrl/P HALT
HALT
Node 8
Node 7
Node 6
Node 5
Node 4
11
7
6
IPL 15
IPL14
INTIM_INTR
IP_INTR
IPL17_INTR
IPL16 _INTR
IPL15_INTR
IPL14 _INTR
DUART0_INTR
5
4
3
2
1
0
BXB-0510-93
System Registers 7-65
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