General Circuit Interface (GCI)
17-8
Am186™CC/CH/CU Microcontrollers User’s Manual
An abort is a signal from the receiver to the remote transmitter indicating that data has been
missed. The receiver sends an abort (indicated with the MTARD bit in the GISTAT register)
by holding MR bits inactive for two or more frames in response to MX bits going active.
Receiving an abort, indicated with the MRAD bit of the GISTAT register, generates a
transmitter interrupt.
The remote transmitter is held off until the Monitor Receive Data register is read, because
MR bits are held active until the receive byte is read. The transmitter does not start the next
transmission cycle until MR bits go inactive.
17.5.2
GCI Structure: Channels and Frames
Figure 17-3 illustrates the GCI terminal mode frame structure. The Am186CC
microcontroller also provides a second interface used with the GCI interface (discussed in
“GCI-to-PCM Converted Pin Interface” on page 17-14). This second interface allows an
external PCM codec to multiplex directly onto a GCI terminal frame B channel. For more
information, see the AMD
IOM-2 Interface Reference Guide, order #12576.
Figure 17-3
GCI Terminal Mode Frame Structure
17.5.3
GCI Applications
The Am186CC microcontroller GCI implementation:
■
Targets the following external ISDN transceivers in GCI mode:
– AMD Am79C30/Am79C32 S
– Siemens PEB2091 U
– Siemens PEB2081 S/T
– Siemens PEB2086 S
– Motorola MC145574 S/T
– Motorola MC145572 U
– National TP3420 S/T
■
Targets the following external codec:
– AMD Am79C04
■
With GCI-to-PCM conversion, targets the following PCM external codecs (see Table 16-3
on page 16-14):
– AMD Am79C02/03
– AMD Am79C031
– Motorola MC14555
B1
B2
Mon0
D
C/I0
MX
MR
IC1
IC2
Mon1
C/I1
MX
MR
TIC
8-bits
8-bits
8-bits
2-bits
2-bits
2-bits
8-bits
8-bits
8-bits
4-bits
8-bits
6-bits
8-bits
8-bits
8-bits
GCI Subframe 0
GCI Subframe 1
GCI Subframe 2
FSC
DD/
DU
Содержание Am186 CC
Страница 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
Страница 4: ...iv Am186 CC CH CU Microcontrollers User s Manual...
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...