Zilog Z16C30 - Manual (Page 14)

1-1
Z16C30 USC ®
U SER ' S M ANUAL Z
ILOG
UM97USC0100
1.1 INTRODUCTION
U SER ’s M ANUAL
C
HAPTER
1
I NTRODUCTION
The Universal Serial Controller (USC ® ) is the next-genera-
tion successor to Zilog’s popular SCC family of multi-
protocol serial controllers, and is recommended for new
designs. Compared to the SCC family and most compet-
ing devices, the USC features more serial protocols, a 16-
or 8-bit data bus, higher data rates, larger FIFOs, better
support for DMA operation, and more convenient software
handling. The USC can handle higher data rates because
it takes its timing reference from the software-selected
receive and transmit clocks and the host bus control
signals, rather than from a separate “bus clock” or “master
clock”.
1.2 FEATURES
■ Two Full-Duplex Multi-Protocol Serial Controllers
■ Supports External DMA Channels with two Request
and two Acknowledge Lines
■ Serial Data Rates to 10 Mbits/Second
■ 32-Character Transmit and Receive FIFOs for each
Channel
■ 8- or 16-Bit Transfers for both Serial Data and
Registers
■ Flexible Adaptation to Various System Buses
■ Serial Modes Include Asynchronous, Bisync, SDLC,
HDLC, Ethernet, and Nine-Bit
■ Two Baud Rate Generators per Channel
■ Digital Phase Locked Loop for each Channel
■ Carrier Detect, Clear to Send, and Two Serial Clock
pins for each Channel
■ Transmit and Receive Frame-Length Counters for
each Channel
■ Async Features Include False-Start Filtering, Stop Bit
Length Programmable by 1/16-bit steps, Parity
Generation/Checking, Break Generation/Detection
■ HDLC/SDLC Features Include 8-Bit Address Checking,
Extended Address Support, 16/32 bit CRC,
Programmable Idle State, Auto Preamble Option, Loop
Mode
■ Sync Features Include 2 to 16-Bit Sync Pattern, Sync
Strip Option, 16/32-bit CRC, Programmable Idle State,
Auto Preamble Option, X.21 XMIT/RCV Slaving
■ Improved Bus/Serial Interlocks Prevent extra Rx DMA
Characters and Ensure Correct FIFO Fill Level
Reporting
■ Flexible Interrupt Modes Including Interrupt
Acknowledge Daisy Chain
■ High-Speed, Low Power CMOS Technology
■ 68-Pin PLCC
UM009402-0201