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SME5224AUPA-400 400 MHz CPU, 4.0 MB E-Cache
UltraSPARC
™
-II CPU Module
July 1999
Sun Microsystems, Inc
JTAG/Debug Interface
Signal Type Name and Function
TDO O IEEE 1149 test data output. A three-state signal driven only when the TAP controller is
in the shift-DR state.
TDI I IEEE 1149 test data input. This pin is internally pulled to logic one when not driven.
TCK I IEEE 1149 test clock input. This pin if not hooked to a clock source must always be
driven to a logic 1 or a logic 0.
TMS I IEEE 1149 test mode select input. This pin is internally pulled to logic one when not
driven. Active high.
TRST_L I IEEE 1149test resetinput (active low). Thispin isinternally pulledto logic onewhen not
driven. Active low.
Initialization Interface
Signal Type Name and Function
UPA_RESET_L I Driven by the system controller for the POR (power-on) resets and the fatal system
reset. Asserted asynchronously. Deasserted synchronous to UPA_CLK. Active low.
UPA_XIR_L I Driven to signal externally initiated reset (XIR). Actually acts like a non-maskable
interrupt. Synchronous to UPA_CLK. Active low, asserted for one clock cycle.
Miscellaneous Signals
Signal Type Name and Function
TEMP_SENSE_NEG
TEMP_SENSE_POS
O Connected to a thermistor
[1]
adjacent to the CPU package.
1. The thermistor used on the module (SME5224AUPA-400) is manufactured by KOA. Operating at 47K the thermistor has KOA part
number NT32BT473J.
POWER_SET_POS
POWER_SET_NEG
O POWER_SET_NEGis tied toGND on themodule. POWER_SET_POS is connected
to GND via a 1690-ohm resistor. Sets voltage of programmable supply.
POWER_OV O Connected to GNDvia a1180-ohm resistor. Sets overvoltagelevelfor programmable
supply.