User`s manual

Am186
TM
CC Microcontroller ISDN TA Reference Design Manual
2-2
Layout and Placement
The ISDN TA reference design emphasizes the small board size that can be obtained
by using the Am186CC communications controller in an embedded
communications application. Refer to Figure 2-1 on page 2-4 for layout and
component placement.
The ISDN TA reference design board has the Flash memory, DRAM, and TIP
connector located close to the processor to provide a linear, logical signal flow for
the address and data bus. The connectors and the power switch are located at the
back of the board, and the status indicator LEDs are located at the front of the
board. This placement makes it possible to manufacture the board in a small
enclosure. The ISDN interface devices are overlapped where possible to minimize
board size. In Table 2-1, all of the parts are identified by part number and part
description.
Table 2-1. ISDN TA Reference Design Parts List
Part
Number
Part
Description
Part
Location
U1 Am186CC communications controller B-1
U2 EDO DRAM - Mosel Vitelic, 256Kx16 A-2
U3 Flash memory - Am29F400, 256Kx16 A-1
U4 ISDN S/T transceiver - Am79C32A A-2
U5 ISDN S transformer B-3
U6 ISDN S choke C-3
U7 Optocoupler B-3
U8 ISDN DC termination IC B-3
U9 ISDN U transceiver - Lucent T7237 A-3
U10 ISDN U transformer B-3
U13 High-Speed UART transceiver C-2
U14 74ACT04 C-1
U15 3.-V LDO C-1
about.book Page 2 Friday, December 18, 1998 9:41 AM