AM79C90PC datasheet(7/62 Pages) AMD

7 / 62 page

Am79C90

PRELIMINARY

READ

(Input/Output, Three-State)

Indicates the type of operation to be performed in the

current bus cycle. This signal is an output when the

C-LANCE is a Bus Master.

High — Data is taken off the DAL lines by the

C-LANCE.

Low — Data is placed on the DAL lines by the

C-LANCE.

The signal is an input when the C-LANCE is a Bus

Slave.

High — Data is placed on the DAL lines by the

C-LANCE.

Low — Data is taken off the DAL lines by the

C-LANCE.

READY

(Input/Output, Open Drain)

When the C-LANCE is a Bus Master, READY is an

asynchronous acknowledgment from the bus memory

that it will accept data in a WRITE cycle or that it has

put data on the DAL lines in a READ cycle.

As a Bus Slave, the C-LANCE asserts READY when it

has put data on the DAL lines during a READ cycle or

is about to take data off the DAL lines during a write

cycle. READY is a response to DAS and will return High

after DAS has gone High. READY is an input when the

C-LANCE is a Bus Master and an output when the

C-LANCE is a Bus Slave.

RENA

Receive Enable (Input)

A logical input that indicates the presence of carrier on

the channel.

RESET

Reset (Input)

Reset causes the C-LANCE to cease operation, clear

its internal logic, force all three-state buffers to the high-

impedance state, and enter an idle state with the stop

bit of CSR0 set. It is recommended that a 3.3 k

Ω pullup

resistor be connected to this pin.

Receive (Input)

Receive Input Bit Stream.

TCLK

Transmit Clock (Input)

10 MHz clock.

TENA

Transmit Enable (Output)

Transmit Output Bit Stream enable. When asserted, it

enables valid transmit output (TX).

Transmit (Output)

Transmit Output Bit Stream.

Power Supply Pin +5 V

±5%

It is recommended that 0.1

µF and 10 µF decoupling

capacitors be used between V

DD and VSS.

Ground

Pin 1 and 24 (48-Pin DlPs) should be connected

together externally, as close to the chip as possible.

AM79C90PC Datasheet(PDF) 7 Page - Advanced Micro Devices

AM79C90PC Datasheet(HTML) 7 Page - Advanced Micro Devices

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