Zilog Z02215 User Manual download pdf

ZiLOG Worldwide Headquarters • 910 E. Hamilton Avenue • Campbell, CA 95008

Telephone: 408.558.8500 • Fax: 408.558.8300 • Internet: www.zilog.com

INTRODUCTION

This Product Update provides errata information for

the Z02215 Single-Chip Modem.

• Problem #1 - Autobaud Detection

• Problem #2 - Parallel Phone Off-Hook and Paral-

lel Phone Pick-Up Detection

• Problem #3 - Ring Indicator (RI)

• Problem #4 - Parallel Phone Pick-Up Detection

The following table lists the firmware versions iden-

tified in this errata.

Note: Initial test vector coverage did not include

UART testing. The testing has been fixed and die

after date code 0136 SL UART has been fully tested.

Problem #1 - Autobaud Detection

Versions: Z02215 ROM Code 4508

Updated: July 17, 2000

Problem: Some character sequences other than AT

can cause the automatic detection of speed and parity

of characters from the terminal to fail, preventing

modem command input from the terminal. This is

expected to be a very rare occurrence in embedded

environments where the communication between the

Z02215 and its host processor are carefully con-

trolled.

Solution: If the Z02215 fails to respond to a modem

AT command, reset the Z02215.

Problem #2 - Parallel Phone Off-Hook

and Parallel Phone Pick-Up Detection

Versio ns: Z02215 ROM Code 4508

Updated: July 17, 2000

Problem: Off-hook and Pick-up detection do not

work properly.

Solution: None

Problem #3 - Ring Indicator (RI)

Versio ns: Z02215 ROM Code 50A5

Updated: July 17, 2000

Problem: After reset, the Z02215 RI

is set to 0V

(active). This is incorrect. This may cause a host pro-

cessor monitoring the RI

to not detect the first RING

signal.

Solution: The state of the RI

signal is corrected by

the Z02215 when the telephone is placed on-hook

after a data connection, or after the first RING is

received from the telephone line. To detect a RING

using the RI

signal, detect the rising edge (that is,

detect the end of the RING when RI

switches from

active to inactive).

Problem #4 - Parallel Phone Pick-Up

Detection

Versio ns: Z02215 ROM Code 50A5

Updated: July 17, 2000

Problem: When pick-up detection is enabled, the

Z02215 will detect itself taking the telephone off-

hook to dial or answer a call as a parallel extension

being taken off-hook. This results in the Z02215

immediately placing the telephone line back on-

hook.

Solution: A software solution for outgoing calls is to

dial:

4508

50A5

Z02215

SINGLE-CHIP MODEM ERRATA

UP002402-1001

1 2

SINGLE-CHIP MODEM ERRATA 1

Summary of Contents

Page 1 - SINGLE-CHIP MODEM ERRATA

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