Intel 210200-002 manual 8286/8287

8286/8287

Table 1. Pin Description

Symbol lYpe

TI

OEI

Ao-A7I/O

~-~(8286) I/O

Bo-B7(8287)

Name and Function

Transmit: T is an input control signal used to control the dl rection of the transceivers. When HIGH, it configures the transceiver'sBo-B7 as outputs with Ao-A7 as inputs. T LOW configures Ao-A7 as the outputs with 80-B7 serving as the inputs.

Output Enable: OE is an input control signal used to enable the appropriate output driver (as selected by T) onto its respective bus. This signal is active LOW.

Local Bus Data Pllis: These pins serve to either present data to or accept data from the processor's local bus depending upon the state of the T pin.

System Bus Data Pins: These pins serve to either present data to or accept data from the system bus depending upon the state of the T pin.

FUNCTIONAL DESCRIPTION

The 8286 and 8287 transceivers are 8-bit transceivers with high impedance outputs. With T active HIGH and OE ac· live LOW, data allhe Ao-A7 pins is driven onlo the Bo-B7 pins. Wilh T inaclive LOW and OE aclive LOW, dala allhe

Bo-B7 pins is driven onto the Ao-A7 pins. No output low glitching will occur whenever the transceivers are enler- ing or leaving Ihe high impedance slale.

78 AFN-01S06B