HDLC External Serial Interface Configuration (TSAs)
16-12
Am186™CC/CH/CU Microcontrollers User’s Manual
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Targets the following external codecs (see Table 16-3 on page 16-14):
– AMD Am79C02/03
– AMD Am79C031
– Motorola MC14555x
– National TP305x family
– National TP307x family
– AT&T T75xx family
– TI/Intel 291x family
■
Targets the following external ISDN transceivers (ISDN requires three channels):
– AMD Am79C30A/32A S/T
– Lucent T7237 U
Note: The Am186CC microcontroller does not provide the PCM codec master clocks for
GCI applications.
16.5.4.2.2
GCI Frame Sync and Clock Conversion
To support a wide variety of external PCM codecs while in GCI mode, the microcontroller
divides down the GCI clock frequency (which is twice the GCI data rate) to match the PCM
data rate. In addition to a divided-down clock, a programmable one-clock-prior-to-data
frame sync (the programmability determines where the frame sync appears relative to a B
channel time slot) provides the needed flexibility to support the targeted PCM codecs (listed
previously). These two converted signals (converted GCI frame sync and converted GCI
clock) are an output on the Am186CC microcontroller’s external communication interface
C. All codec data movement is completely external to the microcontroller and is directly
routed between the PCM codec and the GCI bus. All external PCM codecs directly
connected to the GCI bus must meet all of the following conditions:
1. Be configured to output data on the rising edge of the converted clock and input data
on the falling edge of the converted clock (for GCI bus compatibility).
2. Be able to accept a one-clock-prior-to-data frame sync.
3. Be able to accept an active High frame sync.
4. Be capable of accepting a data clock frequency of 768 KHz.
Note: The Am186CC microcontroller only provides the PCM codec data/bit clock. The
Am186CC microcontroller does not provide the PCM codec master clock(s).
Figure 16-6 and Figure 16-7 illustrate both frame sync programmability and GCI conversion,
respectively.
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Содержание Am186 CC
Страница 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
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Страница 18: ...Table of Contents xviii Am186 CC CH CU Microcontrollers User s Manual...
Страница 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
Страница 39: ...Architectural Overview Am186 CC CH CU Microcontrollers User s Manual 1 15 Figure 1 6 32 Channel Linecard CH CC...
Страница 40: ...Architectural Overview 1 16 Am186 CC CH CU Microcontrollers User s Manual...
Страница 86: ...System Overview 3 36 Am186 CC CH CU Microcontrollers User s Manual...
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...