High-Level Data Link Control (HDLC)
15-2
Am186™CC/CH/CU Microcontrollers User’s Manual
The microcontroller uses FIFOs in both directions (16-byte transmit and 32-byte receive)
to isolate the data requests from the system bus. The controller supports SmartDMA and
programmed I/O for filling or emptying the FIFOs.
Each HDLC channel can connect to an external serial interface directly (nonmultiplexed
mode) or can pass through a time slot assigner (multiplexed mode). An HDLC channel can
connect to a raw Data Communications Equipment (DCE) interface in nonmultiplexed mode,
to a Pulse Code Modulation (PCM) highway interface in multiplexed mode, or to a General
Circuit Interface (GCI) in multiplexed mode. Each HDLC channel has the same feature set
but separate connections to its associated time slot assigner. For more information about
how the HDLC channels can be connected externally, see Chapter 16, “HDLC External
Serial Interface Configuration (TSAs)”.
The HDLC channels support full-duplex data transfer at a rate of up to 10 Mbit/s in raw DCE
and PCM Highway modes, and up to 768 Kbit/s in GCI mode (system performance may
limit total throughput). The microcontroller contains internal PCB registers for configuring
the modes of operation, controlling the HDLC channels, monitoring and reporting status,
and moving data. Each HDLC channel consists of a transmitter, a receiver, and the interface
(programmed I/O or SmartDMA).
The Am186CC microcontroller provides four HDLC channels, A through D, which support
raw DCE, PCM highway, and GCI external interfaces.
The Am186CH HDLC microcontroller provides two HDLC channels, A and B, which support
raw DCE and PCM highway external interfaces.
15.2
BLOCK DIAGRAM
Figure 15-2 shows the block diagram for a single HDLC channel, including connections
with the TSA and GCI.
CC
CH
Содержание Am186 CC
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Страница 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
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Страница 92: ...Emulator Support 4 6 Am186 CC CH CU Microcontrollers User s Manual...
Страница 112: ...DRAM Controller 6 8 Am186 CC CH CU Microcontrollers User s Manual...
Страница 134: ...Interrupts 7 22 Am186 CC CH CU Microcontrollers User s Manual...
Страница 186: ...Programmable I O Signals 9 8 Am186 CC CH CU Microcontrollers User s Manual...
Страница 200: ...Watchdog Timer 11 6 Am186 CC CH CU Microcontrollers User s Manual...
Страница 232: ...Asynchronous Serial Ports UARTs 13 24 Am186 CC CH CU Microcontrollers User s Manual...
Страница 242: ...Synchronous Serial Port SSI 14 10 Am186 CC CH CU Microcontrollers User s Manual...
Страница 264: ...High Level Data Link Control HDLC 15 22 Am186 CC CH CU Microcontrollers User s Manual...
Страница 332: ...Universal Serial Bus USB 18 34 Am186 CC CH CU Microcontrollers User s Manual...
Страница 348: ...Register Summary A 16 Am186 CC CH CU Microcontrollers User s Manual...
Страница 376: ...Index Index 18 Am186 CC CH CU Microcontrollers User s Manual...