User`s manual

Am186 CC Microcontroller ISDN TA Reference Design Manual
ix
About the Am186
TM
CC
Communications Controller ISDN
TA Reference Design
The Am186 CC communications controller ISDN terminal adapter (TA)
reference design is designed as a small, cost-effective ISDN solution for embedded
communications applications. This design is intended to reduce the time to market
for ISDN designers using the Am186CC communications controller. Figure 0-1
shows a block diagram of the ISDN TA reference design.
The ISDN TA reference design is a fully functional ISDN TA that illustrates the
benefits of using the Am186CC communications controller ISDN TA reference
design. The Am186CC communications controller has a number of integrated
features required in many communication applications. These features include four
high-level data link controller (HDLC) channels and a universal serial bus (USB)
peripheral controller with an internal transceiver. The HDLC channels support
GCI/IOM-2, PCM, and DCE interfaces. Other integrated features include four
general-purpose DMA channels, eight SmartDMA™ controller channels, four
time slot assigners (TSAs), UART, High-Speed UART with autobaud, and an
integrated DRAM controller.
The ISDN TA reference design illustrates how to use many of the integrated
peripherals to provide a small, low-cost, ISDN TA. The reference design supports
either an ISDN 2B+D U or S/T network interface by a component population
option. You can interface to a PC using either the High-Speed UART connection
at up to 230 kbps, or by using a full-speed USB connection at 12 Mbps.
Note that the High-Speed UART is capable of 460 kbps, but is limited by the
reference design’s UART transceiver, which is only capable of 230 kbps, and also
by the PCs that the ISDN TA would connect because most of them are only capable
of speeds up to 115 kbps or 230 kbps.
about.book Page ix Friday, December 18, 1998 9:41 AM