AM79C961AVC datasheet(21/206 Pages) AMD

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Am79C961A

SHFBUSY

Shift Busy

Input/Output

This pin indicates that a read from the external

EEPROM is in progress. It is active only when data is

being shifted out of the EEPROM due to a hardware

RESET or assertion of the EE_LOAD bit (ISACSR3, bit

14). If this pin is left unconnected or pulled low with a

pull-down resistor, an EEPROM checksum error is

forced. Normally, this pin should be connected to VCC

through a 10K

Ω pull-up resistor.

EECS

EEPROM CHIP SELECT

Output

This signal is asserted when read or write accesses

are being performed to the EEPROM. It is controlled by

ISACSR3. It is driven at Reset during EEPROM Read.

SLEEP

Sleep

Input

When SLEEP pin is asserted (active LOW), the PC-

net-ISA II controller performs an internal system reset

and proceeds into a power savings mode. All outputs

will be placed in their normal reset condition. All PC-

net-ISA II controller inputs will be ignored except for the

SLEEP pin itself. Deassertion of SLEEP results in the

device waking up. The system must delay the starting

of the network controller by 0.5 seconds to allow inter-

nal analog circuits to stabilize.

XTAL1

Crystal Connection

Input

The internal clock generator uses a 20 MHz crystal that

is attached to pins XTAL1 and XTAL2. Alternatively, an

external 20 MHz CMOS-compatible clock signal can be

used to drive this pin. Refer to the section on External

Crystal Characteristics for more details.

XTAL2

Crystal Connection

Output

The internal clock generator uses a 20 MHz crystal that

is attached to pins XTAL1 and XTAL2. If an external

clock is used, this pin should be left unconnected.

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