DP83256VF datasheet(16/144 Pages) NSC

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30 Functional Description (Continued)

LINE STATE GENERATOR

The Line State Generator allows the transmission of the

PHY Request data and can also generate and transmit Idle

Master Halt or Quiet symbol pairs which can be used to

implement the Connection Management procedures as

specified in the FDDI Station Management (SMT) standard

document

The Line State Generator is programmed through Transmit

bits 0 to 2 (TMk20l) of the Current Transmit State Regis-

ter (CTSR)

Based on the setting of these bits the Transmitter Block

operates in a Transmit Mode where the Line State Genera-

tor overwrites the Repeat Filter and Smoother outputs

See INJECTION CONTROL LOGIC section for a listing of

the injection Transmit Modes

Table 3-4 describes the Transmit Modes

TABLE 3-4 Transmit Modes

Transit Mode

Behavior

Active Transmit Mode

Transmit data that comes

from Configuration Switch

Off Transmit Mode

Transmit Quiet symbol

pairs and disable the PMD

Transmitter

Idle Transmit Mode

Transmit Idle symbol pairs

Master Transmit Mode

Transmit Halt-Quiet

symbol pairs

Quiet Transmit Mode

Transmit Quiet symbol

pairs

Reserved Transmit Mode

Reserved for future use If

Mode selected Quiet

symbol pairs will be

transmitted

Halt Transmit Mode

Transmit Halt Symbol

pairs

Notes

TLF11708 – 7

SE Smoother Enable

C Preamble Counter

IDLE Force

Idle (Stop or ATM)

Xn Current Byte

Xn–1 Previous Byte

W RST

FIGURE 3-6 Smoother State Diagram

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