PRELIMINARY
October 1994
DP83266 MACSITM Device
(FDDI Media Access Controller and System Interface)
Y
On-chip address bit swapping capability
General Description
The DP83266 Media Access Controller and System Inter-
Y
32-bit wide Address/Data path with byte parity
Y
Programmable transfer burst sizes of 4 or 8
face (MACSI) implements the ANSI X3T9.5 Standard Media
32-bit words
Access Control (MAC) protocol for operation in an FDDI
token ring and provides a comprehensive System Interface.
Y
Receive frame filtering services
Y
Frame-per-Page mode controllable on each
DMA channel
The MACSI device transmits, receives, repeats, and strips
tokens and frames. It produces and consumes optimized
data structures for efficient data transfer. Full duplex archi-
tecture with through parity allows diagnostic transmission
and self testing for error isolation and point-to-point connec-
tions.
Y
Demultiplexed Addresses supported on ABus
Y
New multicast address matching feature
Y
ANSI X3T9.5 MAC standard defined ring
service options
Y
Y
Supports all FDDI Ring Scheduling Classes
(Synchronous, Asynchronous, etc.)
Supports Individual, Group, Short, Long and
External Addressing
The MACSI device includes the functionality of both the
DP83261 BMACTM device and the DP83265 BSI-2TM device
with additional enhancements for higher performance and
reliability.
Y
Y
Y
Y
Y
Y
Y
Generates Beacon, Claim, and Void frames
Extensive ring and station statistics gathering
Extensions for MAC level bridging
Enhanced SBus compatibility
Features
Y
Over 9 kBytes of on-chip FIFO
Y
5 DMA channels (2 Output and 3 Input)
Y
Interfaces to DRAMs or directly to system bus
Supports frame Header/Info splitting
Programmable Big or Little Endian alignment
12.5 MHz to 25 MHz operation
Y
Full duplex operation with through parity
Y
Supports JTAG boundary scan
Y
Real-time Void stripping indicator for bridges
Block Diagram
TL/F/11705–1
FIGURE 1-1. FDDI Chip Set Block Diagram
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
TM
BMACTM, BSI-2TM, MACSITM and PLAYER
are trademarks of National Semiconductor Corporation.
a
C
1995 National Semiconductor Corporation
TL/F/11705
RRD-B30M105/Printed in U. S. A.