Catalog excerpts
RoHS compliant, 8 Port RS422 Asynchronous Communications PMC Adapter The 8-Port Asynchronous Communication PMC adapter provides eight 16550-based UARTs using RS422 signaling levels. • • • • • True 16550 UARTs operate at up to 115K baud Front and rear access to I/O 32-bits / 33 MHz PCI bus 3.3V or 5V PCI Signaling RoHS replacement for ACT P/N 8016 (vendor and device IDs preserved, register compatible) Industrial temperature This eight-port asynchronous communication PMC provides eight industry standard 16550-based UARTs using RS422 signaling levels. All eight ports are available out the PMC front panel on J1 68-pin SCSI-style connector. FAST/WIDE SCSI cables can be used to connect between J1 and the user’s system wiring. All eight ports are also wired to the PN4 connector at the rear of the PMC, allowing connection to the VMEbus P2 connector for host processors supporting rear-I/O. Each port provides the full set of data and modem control lines configured for DTE (i.e.,computer side) operation: • • RTS (Request to Send) CTS (Clear to Send) TXD (Transmit Data) RXD (Receive Data) The eight ports each provide the 4 signals above, using 64 of the 68 pins on the SCSI cable; the additional 4 pins of the SCSI cable are connected to signal ground on the PMC card. For the P2 connector I/O, the signal rounds on the P2 “b” row, as established by the VMEbus specification, can be used for the RS422 port signal ground. Since the PN4 signals and J1 signals are in parallel and are not buffered, it is not possible to use both connections simultaneously. The UARTs operate at standard baud rates from 300 baud to 115K-baud. Other odd-baud rates are possible and are available on special order. The UART IC used is a 16C554, which contains four independent 16550 UARTs. The bridge between the 16550 register set and the PCI bus is a PLX 9030 chip, this is a slave only device so all access from the host processor is done through programmed I/O to the PCI bus I/O space, as is customarily done for asynchronous communication software. Once the registers are mapped into host I/O space, standard Async communication drivers may be used to access the ports. The eight interrupt requests from each UART are routed to one of the four INTx lines on the PCI bus. This design avoids interrupt routing switches by incorporating a programmable element which can be set up from the host processor, allowing any UART to be routed to any INTx request line. The default after reset is all UART interrupt requests are routed to the INTA line.
Open the catalog to page 1An optional transition module converts the 68-pin SCSI style connector to eight 9 pin D-Sub connector or terminal blocks. A breakout board is available for rear I/O, which converts the P2 A and C rows back into the 68- pin SCSI style connector. This permits use of the eight port 68-pin SCSI style transition panels. The PMC 8016G is a ROHS and Industrial temperature upgrade and a replacement for P/N 8016. While the 8016 used a PLX 9052 suitable for 5V PCI signaling PMCs only, the 8016G uses a PLX 9030 bridge chip enabling use with 3V or 5V PCI signaling PMCs. Routing Logic Technical Data +5...
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