Mips Technologies R4000 - Interrupt Interface Signals; JTAG Interface Signals

MIPS R4000 Microprocessor User's Manual 207
R4000 Processor Signal Descriptions
8.4 Interrupt Interface Signals
The Interrupt interface signals make up the interface used by external
agents to interrupt the R4000 processor. Int*(5:1) are available only on the
R4000PC; Int*(0) andNMI* are available on all three configurations. Table
8-4 lists the Interrupt interface signals.
Table 8-4 Interrupt Interface Signals
8.5 JTAG Interface Signals
The JTAG interface signals make up the interface that provides the JTAG
boundary scan mechanism. Table 8-5 lists the JTAG interface signals.
Table 8-5 JTAG Interface Signals
Name Definition Direction Description
Int*(5:1) Interrupt Input
Five of six general processor interrupts, bit-
wise ORed with bits 5:1 of the interrupt
register. R4000PC only.
Int*(0) Interrupt Input
One of six general processor interrupts, bit-
wise ORed with bit 0 of the interrupt register.
NMI*
Nonmaskable
interrupt
Input
Nonmaskable interrupt, ORed with bit 6 of the
interrupt register.
Name Definition Direction Description
JTDI JTAG data in Input Data is serially scanned in through this pin.
JTCK TAG clock input Input
The processor outputs a serial clock on
JTCK. On the rising edge of JTCK, both
JTDI and JTMS are sampled.
JTDO JTAG data out Output Data is serially scanned out through this pin.
JTMS JTAG command Input
JTAG command signal, indicating the
incoming serial data is command data.