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The OX16PCI952 is a single chip solution for PCI-based serial and parallel expansion add-in cards. It is a dual function device, offering IO or memory mapped access to the two ultra-high performance OX16C950 UARTs and the bi-directional parallel port. These functions are defined by Function 0 and Function 1, respectively. Serial port cards with 2 serial ports and a parallel port can be designed without redefining any device parameters.
Each UART channel in the OX16PCI952, is the fastest available PC-compatible UART, offering data rates up to 15Mbps and 128-byte deep transmitter and receiver FIFOs.
The deep FIFOs reduce CPU overhead and allow utilisation of higher data rates. Each UART channel is software compatible with the widely used industry-standard 16C550 devices and compatibles, as well as the OX16C95x family of high performance UARTs. In addition to increased performance and FIFO size, the UARTs also provide the full set of OX16C95x enhanced features including automated in-band flow control, readable FIFO levels, etc.
The parallel port is an IEEE 1284 compliant SPP, EPP and ECP parallel port that fully supports the existing Centronics interface. For legacy applications, the PCI resources have been arranged so that the parallel port can be located at standard I/O addresses A set of local registers is available to enhance device driver efficiency and reduce interrupt latency. Each internal UART has features such as shadowed FIFO fill levels, an interrupt source register and Good-Data Status, readable in consecutive DWORD registers and is visible to logical function0 in both IO space and memory space. The local registers also provide additional controls for each UART and the parallel port, to customise the device for the endusers application.
The efficient 32-bit, 33MHz target-only interface is compliant with the PCI bus specification version 2.2 and version 1.0 of PCI Power Management Specification.
For full flexibility, all the default configuration register values can be overwritten using an optional MicrowireTM compatible serial EEPROM.
This EEPROM can also be used to provide function access to pre-configure each UART into enhanced modes or preconfigure the parallel port, prior to any PCI configuration accesses and before control is handed to generic device drivers.
OX16PCI952 Maximum Ratings
Symbol
Parameter
Min
Max
Units
VDD
DC supply voltage
4.75
5.25
V
TC
Temperature Commercial
0
70
OX16PCI952 Features
` Two 16C950 High performance UART channels ` IEEE1284 Compliant SPP/EPP/ECP parallel port ` Multi- function target PCI controller. Fully compliant to PCI bus specification 2.2 and PCI Power Management 1.0. ` Function access to pre-configure each UART and the parallel port, prior to handover to generic device drivers. ` UARTs fully software compatible with 16C550- type devices. ` Baud rates up to 15Mbps in asynchronous mode and 60Mbps in external 1x clock mode ` 128-byte deep FIFO per transmitter and receiver ` Flexible clock prescaler from 1 to 31.875 ` Automated in-band flow control using programmable Xon/Xoff in both directions ` Automated out-of-band flow control using CTS#/RTS# and/or DSR#/DTR# ` Arbitrary trigger levels for receiver and transmitter FIFO interrupts and automatic in-band and out-ofband flow control ` Infra-red (IrDA) receiver and transmitter operation ` 5, 6, 7, 8 and 9-bits data framing ` Global Interrupt Status and readable FIFO levels to facilitate implementation of efficient device drivers ` Detection of bad data in the receiver FIFO ` 2 multi-purpose IO pins which can be configured as interrupt inputs or 'wake-up' pins (via local registers). ` Auto-detection of a range of optional MicrowireTM compatible EEPROMs, to reconfigure device. ` Operation via IO or memory mapping. ` 5.0V operation ` 128 pin TQFP package
