5962F9855201VXX View Datasheet(PDF) - Aeroflex UTMC

Part Name

Description

Manufacturer

5962F9855201VXX

RadHard MicroController

Aeroflex UTMC 

OPERAND DATA BUS ARBITRATION

PIN NAME

BRQ

BGNT

BUSY

BGACK

PIN NUMBER

FLTPK PGA

118

D2

TYPE

TTO

ACTIVE

AL

DESCRIPTION

Bus Request. The UT69R000 asserts this signal to indicate

it is requesting control of the Operand data bus (D0 - D15).

BRQ enters a high-impedance state when the UT69R000

is in the test mode (TEST = 0).

119

E3 TUI

AL

Bus Grant. When asserted, this signal indicates the

UT69R000 may take control of the Operand data bus. It is

tied to an internal pull-up resistor.

120

C1 TUI

AL

Bus Busy. A bus master asserts this input to inform the

UT69R000 that another bus master is using the Operand

data bus. It is tied to an internal pull-up resistor.

117

B1 TTO

AL

Bus Grant Acknowledge Output. The UT69R000 asserts

this signal to indicate it is the current bus master. When

low, BGACK inhibits other devices from becoming the

bus master. When the UT69R000 relinquishes control of

the bus, BGACK enters a high-impedance state.

OPERAND DATA BUS CONTROL

PIN NAME

DTACK

M/IO

R/WR

PIN NUMBER

FLTPK PGA

121

E2

TYPE

TUI

ACTIVE

AL

DESCRIPTION

Data Transfer Acknowledge. This signal tells the

UT69R000 that a data transfer has been acknowledged

and the UT69R000 can complete the bus cycle. To

assure the UT69R000 operates with no wait states,

DTACK can be tied low. DTACK is tied to an internal

pull-up resistor.

112

B3 TTO

--

Memory or I/O. Indicates whether the current bus cycle

is for memory (high) or I/O (low). It remains in the high-

impedance state during bus cycles when the UT69R000

does not control the Operand buses.

114

C4 TTO

--

Read/Write. Indicates the direction of data flow with

respect to the UT69R000. R/WR high means the

UT69R000 is attempting to read data from an external

device, and R/WR low means the UT69R000 is

attempting to write data to an external device. R/WR

remains in a high-impedance state when the UT69R000

does not control the Operand buses.

Continued on page 41.

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