Cyclades-Z series multi-port serial adapter
cz* at pci?
device driver supports the Cyclades-Z
series of multi-port serial adapters. The Cyclades-Z is an intelligent serial
- PLX9060ES PCI bus interface
- Xilinx XC5204 FPGA
- IDT R3052 MIPS CPU
The MIPS CPU runs firmware provided by the device driver. Communication with the
MIPS is performed by modifying data structures located in board local RAM or
The Cyclades-Z comes in three basic flavors:
- Cyclades-8Zo rev. 1 -- This is an older 8-port board with no FPGA. The
serial ports are provided by an octopus cable.
- Cyclades-8Zo rev. 2 -- This is the newer 8-port board. The serial ports
are provided by an octopus cable.
- Cyclades-Ze -- This is the expandable version of the Cyclades-Z. It uses
an HD-50 SCSI cable to connect the board to a 1U rack mountable serial
expansion box. Each box has 16 RJ45 serial ports, and up to 4 boxes may be
chained together, for a total of 64 ports. Boxes 3 and 4 require their own
external power supply, otherwise the firmware will refuse to start (as it
cannot communicate with the UARTs in those boxes).
The Cyclades-Z has several features to improve performance under high serial I/O
- The board may operate in interrupt-driven mode or polled mode to reduce
- Each channel has a large input and output buffer.
- Each channel may be programmed to generate an interrupt based on reception
of a specific character, e.g. a PPP End-Of-Frame character.
- The MIPS CPU on the board performs all flow-control handling.
- dial-in (normal) TTY device
- dial-out TTY device
driver first appeared in
driver was written by
Jason R. Thorpe
and Bill Studenmund
of Zembu Labs, Inc.
driver does not currently implement
communication via host RAM. While this may improve performance by reducing the
number of PCI memory space read/write cycles, it is not straightforward to
implement with the current
Interrupt mode has not been tested.
There is no support for reading or writing the EEPROM connected to the PLX PCI