Intel 80960HD - Manual (Page 56)

809
60HA
/HD/HT
56
Da
ta
sh
ee
t
Figur
e
3
1
.
Ente
ri
ng ONCE
Mo
d
e
CLKIN
ADS, BE3:0, A31:2,
RESET
ONCE
∼ ∼ ∼ ∼
∼ ∼ ∼ ∼
∼ ∼
∼ ∼
∼ ∼
∼ ∼
∼ ∼
∼ ∼
∼∼ ∼∼
CLKIN and V CC Stable and RESET low and ONCE low to
RESET high, minimum 10,000 CLKIN Periods.
D31:0, LOCK, WAIT,
BLAST,W/R, D/C, DEN,
DT/R, HOLDA,
CT3:0, BSTALL, DP3:0,
PCHK
BLAST, FAIL, SUP,BREQ,
V
CC,
VCC5
∼∼
∼ ∼
∼ ∼
∼ ∼
ONCE mode is entered within 1 CLKIN
period after ONCE becomes low while
RESET is low.
∼ ∼ ∼ ∼ ∼ ∼
∼ ∼
CLKIN may neither float nor remain idle.
It must continue to run.
NOTES:
1. ONCE mode may be entered prior to the rising edge of RESET: ONCE input is not latched until the rising
edge of RESET.
2. The ONCE input may be removed after the processor enters ONCE mode.