IBM A2 User Manual page 544

User's Manual
A2 Processor
Bits Field Name
55 UCODE_DIS
56:59 AP
60 EN_ATTN
61 ///
62 EN_ICSWX
63 NOTLB
Alphabetical Register Listing
Page 544 of 897
Initial
Value
0b0 Microcode Disable
0 Enable microcode (normal operation).
1 Disable microcode. (All microcoded instructions cause an unimplemented opera-
tion type of program interrupt.)
0b0000 Auxiliary Processor Available
Per thread enable for auxiliary processor instructions; this field corresponds to threads
[0:3].
0 The auxiliary processor cannot execute any instructions.
1 The processor can execute instructions.
0b0 Enable Attn Instruction
0 Disable "Attn" Instruction; causes an illegal instruction type
1 Enable "Attn" Instruction.
0b0 Reserved
This bit is set to 0 at reset and must not be set to 1. When read, this bit can be 1 or 0.
0b0 Enable icswx Instruction
0 Disable icswx instruction; causes an illegal instruction type
1 Enable icswx Instruction.
0b1 ERAT Only Mode
0 Backing TLB is present.
1 No backing TLB; use ERATs as micro-TLBs.
Description
of
of
program interrupt.
program interrupt.
Version 1.3
October 23, 2012