Texas Instruments TMS380C26 specifications Adapter support function ASF, Clock generator CG

TMS380C26

NETWORK COMMPROCESSOR

SPWS010A±APRIL 1992±REVISED MARCH 1993

The Protocol Handler contains many state machines which provide the following features:

•Transmit and receive frames

•Capture tokens (token ring)

•Provide token-priority controls (token ring)

•Automatic retry of frame transmissions after collisions (Ethernet)

•Implement the Random Exponential Backoff algorithm (Ethernet)

•Manage the TMS380C26 buffer memory

•Provide frame address recognition (group, specific, functional, and multicast)

•Provide internal parity protection

•Control and verify the physical layer circuitry interface signals

Integrity of the transmitted and received data is assured by cyclic redundancy checks (CRC), detection of network data violations, and parity on internal data paths. All data paths and registers are optionally parity-protected to assure functional integrity.

adapter support function (ASF)

The Adapter Support Function (ASF) performs support functions not contained in the other blocks. The features are:

•The TMS380C26 base timer,

•Identification, management, and service of internal and external interrupts,

•Test pin mode control, including the unit-in-place mode for board testing,

•Checks for illegal states, such as illegal opcodes and parity.

clock generator (CG)

The Clock Generator (CG) performs the generation of all the clocks required by the other functional blocks and the local memory bus clocks. This block also generates the reference clock to be sampled by the SIF to determine if the TMS380C26 needs to be placed into slow clock mode. This reference clock is free floating in the range of 10 ± 100 kHz.

user-accessible hardware registers and TMS380C26-internal pointers

The following tables show how to access internal data via pointers and how to address the registers in the host interface. The SIFACL register, which directly controls device operation, is described in detail.

NOTE:

The Adapter-Internal Pointers Table is defined only after TMS380C26 initialization and until the OPEN command is issued.

These pointers are defined by the TMS380C26 software (microcode), and this table describes the release 1.00 and 2.x software.

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