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DP83265 Datasheet

  • DP83265

  • 76頁

  • ETC

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DP83265 BSI Device (FDDI System Interface)
PRELIMINARY
February 1991
DP83265 BSI
TM
Device
(FDDI System Interface)
General Description
The DP83265 BSI device implements an interface between
the National FDDI BMAC
TM
device and a host system It
provides a multi-frame MAC-level interface to one or more
MAC Users
The BSI device accepts MAC User requests to receive and
transmit multiple frames (Service Data Units) On reception
(Indicate) it receives the byte stream from the BMAC de-
vice packs it into 32-bit words and writes it to memory On
transmission (Request) it unpacks the 32-bit wide memory
data and sends it a byte at a time to the BMAC device The
host software and the BSI device communicate via regis-
ters descriptors and an attention notify scheme using clus-
tered interrupts
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
32-bit wide Address Data path with byte parity
Programmable transfer burst sizes of 4 or 8 32-bit
words
Interfaces to low-cost DRAMs or directly to system bus
2 Output and 3 Input Channels
Supports Header Info splitting
Bridging support
Efficient data structures
Programmable Big or Little Endian alignment
Full Duplex data path allows transmission to self
Confirmation status batching services
Receive frame filtering services
Operates from 12 5 MHz to 25 MHz synchronously with
host system
TL F 10791 鈥?1
FIGURE 1 FDDI Chip Set Block Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation
BSI
TM
BMAC
TM
CDD
TM
CRD
TM
and PLAYER
TM
are trademarks of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 10791
RRD-B30M105 Printed in U S A

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