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5–16 Internal Processor Registers
21264/EV68A Hardware Reference Manual
Ibox IPRs
Figure 5–22 Ibox Control Register
Table 5–11 describes the Ibox control register fields.
Table 5–11 Ibox Control Register Fields Description
Name Extent Type Description
SEXT(VPTB[47]) [63:48] RW,0 Sign extended VPTB[47].
VPTB[47:30] [47:30] RW,0 Virtual Page Table Base. See Section 5.1.5 for details.
CHIP_ID[5:0] [29:24] RO This is a read-only field that supplies the revision ID number
for the 21264/EV68A part.
21264/EV68A pass 2.1 ID is 010010
2
.
BIST_FAIL [23] RO,0 Indicates the status of BiST (clear = pass, set = fail),
described in Section 11.5.1.
TB_MB_EN [22] RW,0 When set, the hardware ensures that the virtual-mode loads
in DTB and ITB fill flows that access the page table and the
subsequent virtual mode load or store that is being retried are
‘ordered’ relative to another processor’s stores. This must be
set for multiprocessor systems in which no MB instruction is
present in the TB fill flow, unless there are other mecha-
nisms present that ensure coherency.
MCHK_EN [21] RW,0 Machine check enable — set to enable machine checks.
SEXT(VPTB[47])
VPTB[47:30]
CHIP_ID[5:0]
BIST_FAIL
TB_MB_EN
MCHK_EN
ST_WAIT_64K
PCT1_EN
PCT0_EN
SINGLE_ISSUE_H
VA_FORM_32
VA_48
SL_RCV
HWE
BP_MODE[1:0]
SBE[1:0]
SDE[1:0]
SPE[2:0]
IC_EN[1:0]
SPCE
SL_XMIT
63 29 19 948 18 847 17 716 615 524 1423 13 322 12 221 11 130 20 10 0
LK
99
-
00
2
9
A