dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 94

• Manufacturer Part Number: dp83261
• Description: Bmac Device Fddi Media Access Controller
• Manufacturer: National Semiconductor Corporation

TXED
TXABORT
TXRINGOP
TXCLASS
THTDIS
7 0 Signal Descriptions
Transmission Status
Symbol
Pin
31
32
37
35
36
I O
O
O
O
O
O
Transmitted Ending Delimiter Indicates that the Transmitter completed transmission of the current
or previous PDU TXED is asserted when the current PHY Request byte is a transmitted (not
repeated) Ending Delimiter It remains asserted until the beginning of either the next transmitted (not
repeated) PDU or the next Service Opportunity TXED is cleared by the Master Reset (bit MARST of
the Function Register)
Transmission Aborted Indicates that the Transmitter aborted transmission of the current or
previous PDU before the Ending Delimiter or that the current Service Opportunity was aborted by
Reset or Recovery actions TXABORT is asserted when the current transmitted (not repeated) PDU
has been aborted and remains valid until the end of the transmitted Void frame
TXABORT is cleared by Master Reset (bit MARST of the Function Register) It is also cleared when
an Immediate Claim or Beacon Service Opportunity is terminated by My Claim or My Beacon
received (i e when transition T(47) or T(54) occurs during an Immediate Service Opportunity)
Ring Operational Indicates the current value of the Ring Operational flag
Token Class Indicates the class of the current or previous token in the Transmitter TXCLASS is set
to R Flag when a valid token is received TXCLASS is set to the Issue Token Class when the
RQRDY and RQFINAL signals are asserted (before Token FC time) for the current Service
Opportunity It is cleared by Reset and Recovery actions
Token Holding Timer Disabled Indicates that the Token Holding Timer was disabled when the
current PHY Request byte was generated THTDIS only changes between frames When either signal
TXRDY or TXPASS is asserted after a frame THTDIS reflects the THT usage for that frame for at
least two byte times When TXPASS is asserted while THTDIS is asserted it indicates that TRT
expired
(Continued)
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Description