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STP2002QFP
Sun Microelectronics
Fast Ethernet, Parallel Port, SCSI (FEPS) - STP2002QFP
Figure 11. Receive Host Data Structure
The software has the capability to read and write the FIFOs (including
tags) at any time, using programmed I/O instructions. This feature should be
used for diagnostic purposes only. During normal operation, the FIFOs are
invisible to the software.
5.4.6 TxFIFO Data Structures
Table 14: TxFIFO Data Structures: Control Word Layout
Field Bits Description
Last byte boundary 2:0 This field indicates the offset of the last byte of the packet
within the last data word (or double word), depending on the
configuration, in the FIFO
Status Word
Free Buffer Pointer
Status Word
Free Buffer Pointer
Status Word
Free Buffer Pointer
Status Word
Free Buffer Pointer
0
31
Descriptor
#0
Packet #1
Packet #2
Packet #n
Last Descriptor
Descriptor
#1
Descriptor
#n
31 30 29 16 15 0
OWN
Over-
Flow
Free_Buffer/Packet_Data Size TCP_Checksum
1
Reserved
Free Buffer Pointer