| Forum: / Archiwum Sprzęt 1996 / next uart generation |
| Autor | Wiadomość |
| Andrzej Karpinski
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Posted: 2 Gru 1996 00:29:06 hi! na rynku dostrzeglem ostatnimi czasy karty i/o oparte o 16650 w miejsce 16550 - ponoc charakteryzuja sie wieksza predkoscia i 32 b boforem zamiast 16. czy ktos mial juz cos takiego na blacie i moze cos wiecej napisac? karpio |
| Gregorio Kus
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Posted: 2 Gru 1996 05:25:11 hi!
na rynku dostrzeglem ostatnimi czasy karty i/o oparte o 16650 w miejsce 16550 - ponoc charakteryzuja sie wieksza predkoscia i 32 b boforem zamiast 16. czy ktos mial juz cos takiego na blacie i moze cos wiecej napisac? na blacie nie mialem ale info z miarodajnego zrodla moge podrzucic (Raymond Gwinn - autor driverow do OS/2) 16650 The 16650 by Startech seems a good logical step in the evolution of the 8250 type UARTs. One of the many flavors of the 16650 is a package that is pin compatible with the 40 pin (DIP) 16550s. This means that the 16650 can be placed into the same socket as any 16550, 8250, etc. The 16650 has enhanced the FIFOs to 32 bytes, added on chip flow control ability, and increases the maximum bit rate to 460800. The on chip flow control is a really nice feature. On chip flow control practically eliminates the possibility of missed receive characters. On chip flow control also means that some devices that require immediate attention when it sends Xoff, like the Seiko Label Printer, will work much better in environments like OS/2 and Windows. The 32 byte FIFOs of the 16650 is an improvement over the 16550, but is still a disappointment. I feel that 1k, or larger, FIFOs would have been a much better choice. When I quizzed Startech about this, they replied that the 32 byte FIFOs were chosen to keep the cost down. They added that if the 16650 is successful, they plan a 16750 with larger FIFOs. The 16650 powers up in a 16550 compatible mode, meaning most software written for the 16550 should work. I have discovered a serious incompatibility in the current (Oct 1994) versions of the 16650. All previous UARTS in the 8250 family will issue only a single transmit interrupt if no additional data is sent to the UART. The 16650 on the other hand, will issue continuous transmit interrupts making it necessary to mask the transmit interrupt. I quizzed Startech about this and was told that a new revision of the chip would be available within a few months that would correct this incompatibility. -- /----------------------------------------------------------------- Anonymous Mail Service - http://free.rmnet.it/~grego/AnonMail.html |
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