User’s Manual
IBM PowerPC 750GX and 750GL RISC Microprocessor
PowerPC 750GX Overview
Page 50 of 377
gx_01.fm.(1.2)
March 27,2006
Table 1-5. Exceptions and Conditions
Exception Type
Vector Offset
(hex)
Causing Conditions
Reserved 00000 —
System reset 00100 Assertion of either HRESET
or SRESET or a power-on reset.
Machine check 00200
Assertion of the transfer error acknowledge (T
EA) during a data-bus transaction, asser-
tion of a machine-check interrupt (MCP
), an address, data or L2 double-bit error.
MSR[ME] must be set.
Data storage interrupt 00300 As defined in the PowerPC Architecture (for example, a page fault occurs).
Instruction storage inter-
rupt (ISI)
00400 As defined by the PowerPC Architecture (for example, a page fault occurs).
External interrupt 00500 MSR[EE] = 1 and interrupt (INT
) is asserted.
Alignment 00600
• A floating-point load/store, Store Multiple Word (stmw), Store Word Conditional
Indexed (stwcx.), Load Multiple Word (lmw), Load Word and Reserved Indexed
(lwarx), eciwx, or ecowx instruction operand is not word-aligned.
• A multiple/string load/store operation is attempted in little-endian mode.
• The operand of Data Cache Block Zero (dcbz) is in memory that is write-through-
required or caching-inhibited, or the cache is disabled.
Program 00700 As defined by the PowerPC Architecture.
Floating-point unavailable 00800 As defined by the PowerPC Architecture.
Decrementer 00900
As defined by the PowerPC Architecture, when the most significant bit of the DEC reg-
ister changes from 0 to 1 and MSR[EE] = 1.
Reserved 00A00–00BFF —
System call 00C00 Execution of the System Call (sc) instruction.
Trace 00D00
MSR[SE] = 1 or a branch instruction completes and MSR[BE] = 1. Unlike the architec-
ture definition, Instruction Synchronization (isync) does not cause a trace exception
Reserved 00E00
The 750GX does not generate an exception to this vector. Other PowerPC processors
might use this vector for floating-point assist exceptions.
Reserved 00E10–00EFF —
Performance monitor
1
00F00
The limit specified in a Performance-Monitor Control (PMC) register is reached and
MMCR0[ENINT] = 1.
Instruction address
breakpoint
1
01300
IABR[0–29] matches EA[0–29] of the next instruction to complete,
IABR[TE] matches MSR[IR], and
IABR[BE] = 1.
System management
exception
01400
A system management exception is enabled if MSR[EE] = 1 and is signaled to the
750GX by the assertion of an input signal pin (SMI
).
Reserved 01500–016FF —
Thermal-management
interrupt
1
01700
Thermal management is enabled, the junction temperature exceeds the threshold
specified in THRM1 or THRM2, and MSR[EE] = 1.
Reserved 01800–02FFF —
1. 750GX-specific
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