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NetBSD 6.1.5 - man page for cz (netbsd section 4)

CZ(4)				   BSD Kernel Interfaces Manual 			    CZ(4)

     cz -- Cyclades-Z series multi-port serial adapter device driver

     cz* at pci? dev ? function ?

     The cz device driver supports the Cyclades-Z series of multi-port serial adapters.  The
     Cyclades-Z is an intelligent serial controller comprising:

	   o   PLX9060ES PCI bus interface

	   o   Xilinx XC5204 FPGA

	   o   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 host RAM.

     The Cyclades-Z comes in three basic flavors:

	   o   Cyclades-8Zo rev. 1 -- This is an older 8-port board with no FPGA.  The serial
	       ports are provided by an octopus cable.

	   o   Cyclades-8Zo rev. 2 -- This is the newer 8-port board.  The serial ports are pro-
	       vided by an octopus cable.

	   o   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, other-
	       wise 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 load:

	   o   The board may operate in interrupt-driven mode or polled mode to reduce interrupt

	   o   Each channel has a large input and output buffer.

	   o   Each channel may be programmed to generate an interrupt based on reception of a
	       specific character, e.g. a PPP End-Of-Frame character.

	   o   The MIPS CPU on the board performs all flow-control handling.

     /dev/ttyCZnnnn -- dial-in (normal) TTY device
     /dev/dtyCZnnnn -- dial-out TTY device

     pci(4), termios(4), tty(4)

     The cz driver first appeared in NetBSD 1.5.

     The cz driver was written by Jason R. Thorpe <thorpej@zembu.com> and
     Bill Studenmund <wrstuden@zembu.com> of Zembu Labs, Inc.

     The cz 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 bus_dma(9) API.

     Interrupt mode has not been tested.

     There is no support for reading or writing the EEPROM connected to the PLX PCI bus con-

BSD					   May 17, 2000 				      BSD

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