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DP83265A Datasheet

  • DP83265A

  • 84頁

  • ETC

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DP83265A BSI-2 Device (FDDI System Interface)
PRELIMINARY
November 1994
DP83265A BSI-2
TM
Device
(FDDI System Interface)
General Description
The DP83265A BSI-2 device implements an interface be-
tween the National FDDI BMAC
TM
device and a host sys-
tem It provides a multi-frame MAC-level interface to one or
more MAC Users It is an enhanced version of the DP83265
BSI
TM
device
The BSI-2 device accepts MAC User requests to receive
and transmit multiple frames (Service Data Units) On re-
ception (Indicate) it receives the byte stream from the
BMAC device 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-2 device com-
municate via registers memory-resident descriptors and an
attention notify scheme using clustered interrupts
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Fully software and pin compatible with the original BSI
Over 2 kbytes of on-chip FIFO
Operates from 12 5 MHz to 33 MHz synchronously with
host system
Provides Address bit swapping capability
Reduces interface logic for SBus adapters
32-bit wide Address Data path with byte parity
Programmable transfer burst sizes of 4 or 8 32-bit
words
Interfaces to DRAMs or directly to system bus
2 Output and 3 Input Channels
Supports Header Info splitting
Bridging support
Programmable Big or Little Endian alignment
Full Duplex data path
Receive frame filtering services
Block Diagram
TL F 11407 鈥?1
FIGURE 1-1 FDDI Chip Set
TRI-STATE is a registered trademark of National Semiconductor Corporation
BMAC
TM
BSI
TM
BSI-2
TM
CDD
TM
CRD
TM
and PLAYER
TM
are trademarks of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 11407
RRD-B30M105 Printed in U S A

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