11-04-2004
rs232 pci-card
hello mates,
do you know a manufactor for rs232 serial pci cards for the sparc architecture? it seems that there is no original product from sun for that purpose. strange, isn't it?
problem is that i have a V250 with only one db9 rs232 serial port, and i need it for a modem connection, but i also want to connect an UPS to that system. on my cognition there is no possibility to split a DB9 bus like on DB25 cables, or do i need repetition ;-)
thx in advance
greetings PRESSY
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NTWOC(4) BSD Kernel Interfaces Manual NTWOC(4)
NAME
ntwoc -- Riscom/N2, N2pci, WANic 400 synchronous serial interfaces
SYNOPSIS
ntwoc* at pci? dev ? function ? flags 0
ntwoc0 at isa? port 0x300 irq 5 iomem 0xc8000 flags 1
DESCRIPTION
The ntwoc device driver supports bit-synchronous serial communication using Cisco HDLC framing. The cards are capable of being driven by the
line clock or from an internal baud rate generator. The devices all use the Hitachi hd64570 serial chip. The hd64570 supports 2 asynchro-
nous/byte-synchronous/bit-synchronous serial ports, and has a 4-channel DMA controller for loading the serial port FIFOs.
The ISA Riscom/N2 card has a jumper block to set the IRQ and a DIP switch to set the port address the card will use. The values programmed
into the card must be specified with the port and irq locators in the kernel configuration line. The iomem locator must be specified and
must occur on a 16k boundary. The driver uses a 16k region of io memory. Bit 0 of the flags locator indicates if there is a second serial
port available on the card.
Currently clock source and speed information is specified with the flags locator in the kernel configuration file. The flags field has the
following format.
3 2 1
1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+-------------+ +-----+ +-----+ + +---+ +-+ + +---+ +-+ +
tmc tdiv rdiv e1 rxs1 ts1 e0 rxs0 txs0 np(*)
tmc Defines the timer constant. The base clock frequency is divided by tmc to generate the main clock for receiving and sending.
Further division is possible with the tdiv and rdiv divisor options. A value of 0 is treated as 256.
tdiv Defines the transmit divisor as 2^(tdiv). The internal transmit clock frequency is determined by dividing the base clock fre-
quency by tmc and then dividing by 2^(tdiv).
rdiv Defines the receive divisor as 2^(rdiv). The internal receive clock frequency is determined by dividing the base clock frequency
by tmc and then dividing by 2^(rdiv).
e0 e1 If true the internal clock source is used to drive the line clock for port 0 or port 1 respectively.
rxs0 rxs1 Specifies which clock source to use for receiving data on port 0 and port 1 respectively. The following values are accepted:
0
Line clock.
1
Line clock with noise suppression.
2
Internal clock.
txs0 txs1 Specifies which clock source to use for transmitting data on port 0 and port 1 respectively. The following values are accepted:
0
Line clock.
1
Internal clock.
2
Receive clock.
np (For the ISA card only) A value of 1 indicates there is a second serial port present on the card. This is auto-detected on the
PCI card and need not be specified.
HARDWARE
Cards supported by the ntwoc driver include:
SDL Communications Riscom/N2
SDL Communications N2pci
SDL Communications WANic 400 (untested)
DIAGNOSTICS
ntwoc0: TXDMA underrun - fifo depth maxed Indicates that the serial port's FIFO is being drained faster than DMA can fill it. The driver
automatically increases the low-water mark at which to begin DMA transfers when underruns occur. This diagnostic is issued when the low-
water mark is maximized (i.e., 1 less than the depth of the FIFO).
ntwoc0: RXDMA buffer overflow Indicates that a frame is being received by the card, but there are no free receive buffers.
SEE ALSO
intro(4), isa(4), pci(4), ifconfig(8)
HISTORY
The PCI driver first appeared in NetBSD 1.4. Much of the ISA driver was adapted from the FreeBSD sr driver and first appeared in NetBSD 1.5.
BUGS
Use of the flags locator for setting the clock sources and speeds should be replaced with ioctl's and a control program.
BSD
October 2, 1998 BSD