TS68302VR16 datasheet(41/47 Pages) ATMEL

41 / 47 page

TS68302

2117A–HIREL–11/02

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maintenance of four 16-bit error counters,

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provides asynchronous link over which DDCMP may be used,

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Flow control character transmission supported.

Serial Communication Port

The SCP is a full-duplex, synchronous, character-oriented channel which provides a

three-wire interface (TXD, RXD, and clock). The SCP consists of independent transmit-

ter and receiver sections and a common SCP clock generator. The transmitter and

receiver section use the same clock, which is derived from the main clock by an on-chip

baud rate generator. The TS68302 is an SCP master, generating both the enable and

the clock signals. The enable signals may be generated by the general-purpose I/O

pins.

The SCP allows the TS68302 to communicate with a variety of serial devices for the

exchange of status and control information using a subset of the Motorola serial periph-

eral interface (SPI). Such devices may include industry-standard CODECs and other

microcontrollers and peripherals.

The SCP can be configured to operate in a local loopback mode, which is useful for

diagnostic functions. The receiver and the transmitter operate normally in these modes.

The SCP features are as follows:

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three-wire interface (SPTXD, SPRXD, and SPCLK),

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full-duplex operation,

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clock rate up to 4.096 MHz,

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programmable baud rate generator,

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local loopback capability for testing purposes.

Serial Management

Controllers

The SMCs are two synchronous, full-duplex ports that may be configured to operate in

either IDL or GCI mode to handle the maintenance and control portions of these inter-

faces. The SMC ports are not used in PCM or NMSI modes.

The SMC features are as follows:

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two modes of operation - IDL and GCI,

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local loopback capability for testing purposes,

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full-duplex operation,

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SMC1 in GCI mode detects collisions on the D channel.

Serial Channels Physical

Interface

The serial channels physical interface connects the physical layer serial lines and the

serial controllers (three SCCs and two SMCs). The interface implements both the rout-

ing and the time-division multiplexing for the full ISDN bandwidth. It supports four buses:

IDL, GCI, PCM, and NMSI (a nonmultiplexed modem interface). The multiplexed modes

(IDL, GCI, and PCM) also allow multiple channels (e.g., ISDN B channels) or user-

defined subchannels to be assigned to a given SCC. The serial interface also supports

two testing modes: echo and loopback.

For the IDL and GSI buses, support of management functions in the frame structure is

provided by the SCP or SMCs, respectively. Refer to Figure 29 for the serial channels

physical interface block diagram.

TS68302VR16 Datasheet(PDF) 41 Page - ATMEL Corporation

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