Compaq EV68A specifications Ecc

ECC

64-bit data and check bit code, 8–2

Dcache data single-bit correctable errors, 8–3for system data bus, 8–2

memory/system port single-bit correctable errors, 8–7

store instructions, 8–4ENABLE_EVICT Cbox CSR, 4–23 ,5–39

ENABLE_PROBE_CHECK Cbox CSR, 8–2defined, 5–35

ENABLE_STC_COMMAND Cbox CSR, defined, 5–35

Energy star certification, 7–9Error case summary, 8–10 Error correction code. See ECC Error detection mechanisms, 8–1EV6Clk_x signal pins, 3–4

Evict, 21264/EV68A command, 4–13 ,4–22 ,4–39EVICT_ENABLE Cbox CSR, 7–13

EXC_ADDR exception address register, 5–8

after fault reset, 7–8

at power-on reset state, 7–15EXC_SUM exception summary register, 5–13

at power-on reset state, 7–15Exception and interrupt logic, 2–8Exception condition summary, A–15

External cache and system interface unit. See Cbox External convention, xxi

External interface initialization, 7–14

EXTEST public instruction, B–1

F

F31

load instructions with, 2–23retire instructions with, 2–22

Fast data disable mode, 4–33Fast data mode, 4–30 ,4–31

FAST_MODE_DISABLE Cbox CSR, 4–30defined, 5–34

Fault reset flow, 7–8

Fault reset sequence of operations, 7–9FAULT_RESET reset machine state, 7–18

Fbox

described, 2–10

executed in pipeline, 2–16FEN fault, 6–13

FetchBlk, 21264/EV68A command, 4–22 ,4–39system probes, with, 4–41

FetchBlkSpec, 21264/EV68A command, 4–22 ,4–39

Field notation convention, xxi

Floating-point arithmetic trap, pipeline abort delay with, 2–16

Floating-point control register, 2–35PALcode emulation of, 6–11

Floating-point execution unit. See Fbox

Floating-point instructions

IEEE, A–9independent, A–11VAX, A–11

Floating-point issue queue, 2–7

Forwarding clock pin groupings, E–1

FPCR. See Floating-point control register

FQ. See Floating-point issue queue

FrameClk_x signal pins, 3–5 ,4–30

G

GCLK, 7–19

Global predictor, 2–4

H

Heat sink center temperature, 10–1

Heat sink specifications, 10–3

HW_INT_CLR hardware interrupt clear register, 5–12

at power-on reset state, 7–15updating, D–18

HW_LD PALcode instruction, 6–3 ,A–9 ,D–18HW_MFPR PALcode instruction, 6–6 ,A–9HW_MTPR PALcode instruction, 6–6 ,A–9HW_REI PALcode instruction, A–9HW_RET PALcode instruction, 6–5HW_ST PALcode instruction, 6–4 ,A–9

I

I/O address space

instruction data merging, 2–29load instruction data merging, 2–28load instructions with, 2–27

store instructions with, 2–29I/O write buffer, 2–11

defined, 2–32

21264/EV68A Hardware Reference Manual Index–5