DP83257VF National Semiconductor, DP83257VF Datasheet - Page 16

• Manufacturer Part Number: DP83257VF
• Description: IC FDDI LAYER CTRLR 160PQFP
• Manufacturer: National Semiconductor

Specifications of DP83257VF

• Controller Type: physical layer controller
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-BFQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Supply: -
• Interface: -
• Other names: *DP83257VF

3 0 Functional Description
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 (TM
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
Notes
F IDLE Force Idle (Stop or ATM)
X
n–1
SE Smoother Enable
X
W RST
C Preamble Counter
n
Current Byte
Previous Byte
k
2 0
l
) of the Current Transmit State Regis-
FIGURE 3-6 Smoother State Diagram
(Continued)
16
Active Transmit Mode
Off Transmit Mode
Idle Transmit Mode
Master Transmit Mode
Quiet Transmit Mode
Reserved Transmit Mode
Halt Transmit Mode
Transit Mode
TABLE 3-4 Transmit Modes
Transmit data that comes
from Configuration Switch
Transmit Quiet symbol
pairs and disable the PMD
Transmitter
Transmit Idle symbol pairs
Transmit Halt-Quiet
symbol pairs
Transmit Quiet symbol
pairs
Reserved for future use If
Mode selected Quiet
symbol pairs will be
transmitted
Transmit Halt Symbol
pairs
TL F 11708– 7
Behavior