General Circuit Interface (GCI)
Am186™CC/CH/CU Microcontrollers User’s Manual
17-9
– National TP305x family
– National TP307x family
– AT&T T75xx family
– TI/Intel 291x family
■
Supports GCI Terminal Mode
■
Supports GCI Slave Mode (i.e., a timing slave where the GCI_FSC_A and GCI_DCL_A
signals are inputs)
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Supports interdevice communication via Monitor and Command/Indicate channels
■
Supports the TIC bus, providing the capability of connecting more than one device to
the D and C/I channels in the first subframe (via C/I0 and D-channel arbitration)
■
Supports D-channel Collision Detection via the Echo bits from the S-interface
■
Is multiplexed with
one fixed Am186CC external raw DCE interface
■
Does not support:
– GCI Linecard Mode
– GCI Master Mode
– TIC bus A/B bit: an optional supplementary bit used for D-channel control: 1 indicates
the D channel is available, 0 indicates the D channel is blocked
– The following terminal mode signals (used for connecting non-GCI components):
– BCL: 1X-bit rate clock
– SDS1 and SDS2: Data strobes which identify the location of the B channels
17.5.4
GCI Bus
17.5.4.1
GCI Bus Deactivation/Activation
The GCI bus includes an activation/deactivation capability. Either upstream components or
downstream components on the bus can initiate activation and deactivation. Figure 17-4
illustrates the activation/deactivation process. When deactivated, the upstream device
holds all clock outputs Low. The downstream device holds all the clock outputs Low, and
forces open drain data outputs to a high-impedance state (seen as a High on the system
bus due to the external pullup resistor). The activation/deactivation procedure is a
combination of software handshakes through the C/I channel, and hardware indications
through the clock and data lines. The AMD
IOM-2 Interface Reference Guide, order #12576,
describes both the hardware and the software protocols in detail.
Содержание Am186 CC
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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...