Z8523Lxx Enhanced Serial Communication Controller - Dual channel, multiprotocol data communication peripheral solutions
Zilog have introduced the 3.3V addition to the Z85230xx Enhanced Serial Communications Controller family of devices.
The Z8523Lxx series of devices will provide a migration path to a 3.3V supply voltage for existing 5V designs, and to new customers looking to add an ESCC on their low supply voltage based projects. This “stand- alone” Enhanced Serial Communications Controller provides dual, full-duplex, multi-protocol (Async, Monosync, Bisync, SDLC/HDLC, and SDLC/HDLC Loop) parallel / serial data conversion. The 3.3 V version is available in the 8, 10, and 16 MHz speed grades (the 20Mhz version is not available at this time), in the 44 pin PLCC RoHs packaging only. Extended temperature range versions are also available.
Overview
The Zilog Serial Communication Controllers (SCC) can support dual channel and multiple protocols that easily interface to 8/16-bit addressable non-multiplexed address/data buses.
The SCC can be configured to satisfy a wide variety of serial communications applications. On-chip features include baud rate generators, digital PLLs, and crystal oscillators to reduce external logic. Additional features include optimized FIFOs to support high speed SDLC transfers using DMS controllers.
The SCC handles asynchronous formats, synchronous byte-oriented protocols and synchronous bit-oriented protocols. The SCC can generate and check CRC codes in any synchronous mode and can be programmed to check data integrity in various modes. The SCC also has facilities for modern controls in both channels. In applications where these controls are not needed, the modern controls can be used for general-purpose I/O.
Zilog SCCs are designed for use in multiple applications with serial communication needs.
SCC Detailed Feature Set
- Full Duplex Channels
- Up to 4.1 Mbit/sec
- Separate Crystal Oscillator
- Baud Rate Generator
- Digital Phase-Locked Loop for Clock Recovery
- Encoding Supported
- NRZ
- NRZI
- Manchester
- FM Data Encoding
- Protocols Supported
- SDLC/HDLC
- T1 Digital Trunk
- Clock Speeds: 8, 10, 16 and 20 MHz available
- Synchronous Mode CRC Generation and Checking (CRC-16 or CRC-CCITT)
- Local Loopback and Auto Echo Modes
- Enhanced DMA Support
- Some original NMOS SCC products are still offered, see www.Zilog.com
Enhanced Serial Communications Controller (ESCC)
- All of the SCC features as above, plus:
- Improvements that reduce CPU overhead
- Deeper FIFO’s: 4-byte transmit, and 8-byte receive FIFO
- SDLC packet handling improvements
- Low voltage version (3.0 to 3.6V) available
Universal Serial Controller (USC) Z16C30
- Two independent, 0 to 10Mbps, full-duplex channels
- 2 BRGs and 1 DPLL per channel
- 32-byte data FIFO’s for each receiver and transmitter
- DMA interface with separate request and acknowledge
- Same protocols supported as noted in the SCC feature set
Integrated Universal Serial Controller (IUSC) Z16C32
- Single full-duplex, 0 to 20 Mbps channel
- 2 BRG and 1 DPLL
- 2 full-capacity 20MHz DMA channels, each with 32-bit addressing and 16-bit data transfers
- 32-byte data FIFO’s for each receiver and transmitter
- Same protocols supported as noted in the SCC feature set