
19
Highly Integrated 64-Bit RISC; L2-Cache, DRAM, PCI Interfaces
UltraSPARC-IIi CPU
SME1430LGA-360
SME1430LGA-440
SME1430LGA-480
May 1999
Sun Microsystems, Inc
Initialization Interface
Symbol
Volts
Type
Signal
Transitions
Aligned with:
Name and Function
P_RESET_L
3.3 V
I
Not Aligned
For non power-on resets (debug); asynchronous assertion and
de-assertion; active low
X_RESET_L
I
Driven to signal XIR traps (debug); acts as non-maskable
interrupt; asynchronous assertion and de-assertion; active low
SYS_RESET_L
I
Driven for power-on resets (POR); asynchronous assertion and
de-assertion; active low [1]
1. SYS_RESET_L must be a clean indication that 3.3 V, 5 V, etc. are stable and within specication. No anomalies may be present, beginning when
the power supplies are turned on and extending until the signals are within specication. When signals are within specication, the power supply
can transition monotonically to 3.3 V.
RST_L
O
Resets PCI subsystem; Asynchronous assertion and monotonic
deassertion; also used for UPA64S reset
RMTV_SEL
I
Red Mode Trap Vector Select; pull up if alternate PC-compatible
boot vector is required
CLKSEL
I
Pullup to enable the 2x function of the CLKA/B PLL; L2-cache
interface still works at 1/2 the internal processor clock rate
EPD
1.9 V
O
Asserted when
the UltraSPARC-IIi CPU is in clock shutdown
mode; use P_RESET_L to re-start
SYNC_3TO1_MODE
3.3 V
I
This is a new pin denition for the SME1430 IIi CPU. (The
SME1040 IIi CPU denes this pin as VSSPLL.)
This pin selects the number of synchronizing stages between the
PCI interface and the CPU core clock domains. A 0 selects a two
stage synchronizer, a 1 selects three stages. This pin is normally
tied low as previously done when it was dened as VSSPLL