SCC(4) OpenBSD Programmer's Manual (Alpha) SCC(4)NAMEscc - Zilog serial communications interface
SYNOPSIS
scc0 at ioasic?
scc1 at ioasic?
DESCRIPTION
The scc driver provides support for the Zilog 8530 Serial Communications
Controller (SCC) via the IOCTL asic on TURBOchannel-based alphas (the DEC
3000 series). Each scc device has two serial ports.
Input and output for each line may set to one of following baud rates;
50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200,
38400, or 57600. Speeds up to 230400 are supported by the chip and the
motherboard, but speeds higher than 57600 do not work reliably without an
external clock signal.
FILES
/dev/ttyB0
/dev/ttyB1
The mapping from units to serial-hardware outlets is idiosyncratic.
SEE ALSOintro(4), tty(4)HISTORY
The scc driver first appeared in 4.4BSD.
BUGS
The IOCTL asic provides internal DMA channels that can be programmed to
transfer up to 4096 bytes of data into, or out, of an SCC without further
software intervention. This feature of the ioctl asic is not yet
supported.
The mapping from device-special files (major and minor number) to chip
and port is arguably backwards.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9