HDLC External Serial Interface Configuration (TSAs)
Am186™CC/CH/CU Microcontrollers User’s Manual
16-11
16.5.4
External Interfaces
As mentioned previously, the Am186CC and Am186CH microcontrollers’ external data
streams can take the following forms: raw DCE and PCM Highway. When connecting directly
to an individual HDLC, raw DCE format is available. When HDLC data passes through a
TSA, the PCM Highway interface is available.
In addition, the Am186CC microcontroller supports the GCI external data stream when
HDLC data passes through a TSA.
16.5.4.1
Raw DCE
Raw DCE is a synchronous serial bus generally used in modem and other high-speed serial
applications, and runs at up to 10 Mbit/s. The Am186CC and Am186CH microcontroller
implementation requires transmit (TCLK) and receive (RCLK) clock inputs, has receive
(RXD) and transmit data (TXD), and the Clear-To-Send (CTS) and Ready-To-Receive (RTR)
flow control signals.
16.5.4.2
PCM Highway
PCM Highway is a generic serial bus used to support a wide range of data rates (including
E1/T1) and runs at up to 10 Mbit/s. The Am186CC and Am186CH microcontroller
implementation is composed of data transmit (TXD), data receive (RXD), data clock (CLK),
frame sync clock (FSC), and time slot control (TSC) signals.
Each of the individual PCM Highway interfaces are pin-multiplexed with one or more of the
following serial bus interfaces: raw DCE and High-Speed UART.
In the Am186CC microcontroller, the individual PCM Highway interfaces are also pin-
multiplexed with GCI. A converted GCI frame sync and clock interface for the PCM codecs
is also multiplexed with one of the four PCM Highway interfaces. For a listing of all the pin
multiplexing, see Table 16-1 on page 16-5.
PCM channel configuration (e.g., channel size, channel length, channel placement, etc.)
is provided through proper TSA initialization.
16.5.4.2.1
PCM Highway Applications
The PCM Highway implementation features the following:
■
Every TSA can support a separate PCM physical interface simultaneously.
■
Each PCM interface is pin-multiplexed with other serial bus interfaces.
■
All of the HDLC channels can be routed to PCM Highway interface A.
■
Each HDLC channel supports PCM channel time slot selection, fully configurable
through the integrated TSAs.
■
GCI clock and frame synchronization conversion and routing directly from the GCI to
the PCM Highway interface are supported for external codec applications. Data is routed
externally (with respect to the Am186CC microcontroller) directly from the codec to the
GCI transceiver device for this type of application.
■
Support for a time slot control signal that asserts for the duration of the programmed
time slots.
CC
CC
CC
Summary of Contents for Am186 CC
Page 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
Page 4: ...iv Am186 CC CH CU Microcontrollers User s Manual...
Page 18: ...Table of Contents xviii Am186 CC CH CU Microcontrollers User s Manual...
Page 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
Page 40: ...Architectural Overview 1 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 86: ...System Overview 3 36 Am186 CC CH CU Microcontrollers User s Manual...
Page 92: ...Emulator Support 4 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 112: ...DRAM Controller 6 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 134: ...Interrupts 7 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 186: ...Programmable I O Signals 9 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 200: ...Watchdog Timer 11 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 232: ...Asynchronous Serial Ports UARTs 13 24 Am186 CC CH CU Microcontrollers User s Manual...
Page 242: ...Synchronous Serial Port SSI 14 10 Am186 CC CH CU Microcontrollers User s Manual...
Page 264: ...High Level Data Link Control HDLC 15 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 332: ...Universal Serial Bus USB 18 34 Am186 CC CH CU Microcontrollers User s Manual...
Page 348: ...Register Summary A 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 376: ...Index Index 18 Am186 CC CH CU Microcontrollers User s Manual...