series multi-port serial adapter device
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
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 interrupt load.
- 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
- The MIPS CPU on the board performs all flow-control
- 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