dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 78

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

RCSTART
FCRCVD
DARCVD
SARCVD
INFORCVD
7 0 Signal Descriptions
7 3 2 2 PDU Sequencing
The PDU Sequencing signals apply to the data and status available at the MAC Indicate Interface They are used to determine
the validity of the data (MID7 – 0) and parity (MIP) In addition the sequencing signals are used to determine the validity of the
Addressing Flags and the Frame Status such as the Control Indicators All timing is explained relative to the byte present on the
MAC Indicate Interface
Symbol
Pin
51
52
55
59
62
I O
O
O
O
O
O
Receive Start Indicates that a MAC PDU Starting Delimiter has been received It is asserted when
the Starting Delimiter is present at the MAC Indicate Interface
Frame Control Received Indicates that the Frame Control field is present It is asserted when the
Frame Control field is present at the MAC Indicate Interface
Destination Address Received Indicates that the Destination Address has been received It is
asserted on the last byte of the Destination Address and remains asserted until the next PDU Starting
Delimiter is received
Source Address Received Indicates that the Source Address has been received It is asserted on
the last byte of the Source Address and remains asserted until the next PDU Starting Delimiter is
received
Information Field Received Indicates that four bytes of the Information field have been received It
is asserted on the fourth byte of the INFO field and remains active until the next PDU Starting
Delimiter is received
(Continued)
78
Description