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eZ80F91 Modular Development Kit

User Manual

UM017010-0112 eZ80F91 Module Operational Description

Flash via the full system bus, which is available on the expansion inter-

face connectors.

PHY Circuit

The PHY KS8721 circuit has been extensively tested. However, for new

designs, Zilog recommends that you refer to the following documentation

on the Micrel website.

•

KS8721BL/SL 3.3 V Single Power Supply 10/100 Base-TX/FX MII

Physical Layer Transceiver Data Sheet

•

KS8721BL/KS8721CL/KS8001L Design Guide for Interchangeabil-

ity (Application Note 134)

IrDA Transceiver

The eZ80F91 Mini Enet Module is shipped without an IrDA transceiver

installed. If you install an on-board transceiver, such as Zilog’s ZHX1810,

it connects to PD0 (TX), PD1 (RX) and PD2 (Shutdown, IR_SD). The

IrDA transceiver is of the LED type 870 nm Class 1. The IrDA transceiver

is accessible via the IrDA Controller attached to UART0 on the eZ80F91

device.

To save power or to use the UART0 as a console, the transceiver can be

disabled by the software or by an off-board signal when using the proper

jumper selection. The transceiver is disabled by setting PD2 (IRDA_SD)

High or by pulling the DIS_IRDA

pin on the I/O connector Low. The

shutdown feature is used to save power. To enable the IrDA transceiver,

DIS_IRDA

remains floating and PD2 is pulled Low.

The RxD and TxD signals on the transceiver perform the same functions

as a standard RS-232 port. However, these signals are processed as IrDA

3/16 coding pulses (sometimes called IrDA encoder/decoder pulses).

When the IrDA function is enabled, the final output to the RxD and TxD

pins are routed through the 3/16 pulse generator.

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Zilog EZ80F916 Manual de usuario Pagina 29