Z85233 Datasheet, PDF (316/317 Pages) Zilog, Inc. – The Zilog SCC Serial Communication Controller

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
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