Z80230 データシートの表示（PDF） - Zilog

部品番号

コンポーネント説明

メーカー

Z80230

Zilog SCC Serial Communication Controller

Zilog 

USER’S MANUAL

ZILOG ESCC™

CONTROLLER

QUESTIONS AND ANSWERS

PRODUCT DESCRIPTION

Q. Which of the following is the major factor in differ-

entiating the ESCC from the USC Family?

a. The ESCC has less communications channels

than the USC

b. The protocols supported by ESCC and USC are

different

c. The ESCC is limited in operation to less than

5 Mbps, but the USC Family can operate up to

10 Mbps

d. The USC supports the T1 data rate, not the ESCC

A. (c) Most ESCC and USC Family members have two

channels and protocols. Support by the SCC is a

subset of ESCC. Both ESCC and USC can sup-

port T1 data rates so (a), (b), (d) are not correct.

Q. Which of the following is not an improvement from

the SCC to the ESCC?

a. The ESCC has deeper FIFOs

b. The ESCC has new SDLC enhancements

c. The ESCC has added new READ Registers

d. The ESCC has added new WRITE Registers

A. (c) No new READ register addressing is added in the

ESCC although we allowed some Write Registers

to become readable through the existing READ

Register.

The ESCC has 4 bytes of Tx FIFO and 8 bytes of Rx FIFO,

while the SCC has 1 byte for the Tx and 3 bytes for the Rx.

The ESCC has many new SDLC enhancements, such as

automatic EOM reset, automatic opening flag generation,

etc.

The ESCC has added WR7' as a new WRITE Register to

configure the new options, therefore, (a), (b), (d) are all dif-

ferences between the SCC and ESCC.

UM010901-0601

7-11

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