80960JD datasheet(14/61 Pages) INTEL

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PRELIMINARY

80960JD

HOLD

S(L)

HOLD: A request from an external bus master to acquire the bus. When the

processor receives HOLD and grants bus control to another master, it asserts

HOLDA, floats the address/data and control lines and enters the Th state. When

HOLD is deasserted, the processor deasserts HOLDA and enters either the Ti or Ta

state, resuming control of the address/data and control lines.

0 = no hold request

1 = hold request

HOLDA

R(Q)

H(1)

P(Q)

HOLD ACKNOWLEDGE indicates to an external bus master that the processor has

relinquished control of the bus. The processor can grant HOLD requests and enter

the Th state during reset and while halted as well as during regular operation.

0 = hold not acknowledged

1 = hold acknowledged

BSTAT

R(0)

H(Q)

P(0)

BUS STATUS indicates that the processor may soon stall unless it has sufficient

access to the bus; see i960® Jx Microprocessor User’s Guide (272483). Arbitration

logic can examine this signal to determine when an external bus master should

acquire/relinquish the bus.

0 = no potential stall

1 = potential stall

Table 4. Pin Description — Processor Control Signals, Test Signals and Power (Sheet 1 of 2)

NAME

TYPE

DESCRIPTION

CLKIN

CLOCK INPUT provides the processor’s fundamental time base; both the processor

core and the external bus run at the CLKIN rate. All input and output timings are

specified relative to a rising CLKIN edge.

RESET

A(L)

RESET initializes the processor and clears its internal logic. During reset, the

processor places the address/data bus and control output pins in their idle (inactive)

states.

During reset, the input pins are ignored with the exception of LOCK/ONCE, STEST

and HOLD.

The RESET pin has an internal synchronizer. To ensure predictable processor initial-

ization during power up, RESET must be asserted a minimum of 10,000 CLKIN

cycles with VCC and CLKIN stable. On a warm reset, RESET should be asserted for

a minimum of 15 cycles.

STEST

S(L)

SELF TEST enables or disables the processor’s internal self-test feature at initial-

ization. STEST is examined at the end of reset. When STEST is asserted, the

processor performs its internal self-test and the external bus confidence test. When

STEST is deasserted, the processor performs only the external bus confidence test.

0 = self test disabled

1 = self test enabled

Table 3. Pin Description — External Bus Signals (Sheet 4 of 4)

NAME

TYPE

DESCRIPTION

80960JD 데이터시트(PDF) 14 Page - Intel Corporation

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