5962F9855201QXC View Datasheet(PDF) - Aeroflex UTMC

Part Name

Description

Manufacturer

5962F9855201QXC

RadHard MicroController

Aeroflex UTMC 

OSCIN

CK1

CK2

CK3

CK4

STATE1

OE

WE

RISC

ADDRESS

RISC

DATA

ADDRESS VALID (ACC)

NEXT ADDRESS

LRI

INSTRUCTION

DATA VALID (RSn)

Figure 19. LRI Instruction Typical Timing

NEXT

INSTRUCTION

After the UT69R000 recognizes the current bus cycle is

finished, DS becomes inactive (transition from low to high) on

the first rising edge of OSCIN after the end of time period CK4.

The bus cycle completely ends one full clock cycle after the

end of time period CK4, when BGACK, R/WR, and the

Operand Address and Data buses enter a high-impedance state.

4.2 DMS Operation and Bus Arbitration

Figure 22 shows the timing diagram of the signal relationships

for the UT69R000 during a DMA operation. For DMA

operations, multipurprocessor, and Operand bus arbitration

functions, the UT69R000 provides four active-low control

signals for managing the Operand bus and preventing bus

contention. These signals are Bus Request (BRQ, Bus Grant

(BGNT), Bus Busy (BUSY), and Bus Grant Acknowledge

(BGACK).

Each of the four bus control signals provides a specific function

for controlling Operand bus operation. The function of each

of the four signals is given below.

21

Bus Request (BRQ)

The UT69R000 generates BRQ to indicate a request to use the

Operand buses. The UT69R000 retains control of the buses by

keeping the BGACK signal active until it no longer requires

the buses.

Bus Grant (BGNT)

An external arbitrator generates this input indicating to the

UT69R000 that it has the highest priority. This informs the

UT69R000 to control the Operand buses as soon as the present

bus master relinquishes bus control by asserting BUSY.

Bus Busy (BUSY)

Another bus master generates BUSY input to the UT69R000,

indicating another bus master is using the bus.

Bus Grant Acknowledge (BGACK)

The UT69R000 generates this signal to indicate it is the present

bus master. BGACK enters a high-impedance state when the

UT69R000 gives up control of the Operand buses.

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