EECS 373 F98 Notes 10-1 © 1998 Steven K. Reinhardt
Advanced Bus Techniques
How to make busses work more efficiently:
•Burst transfers
•Pipelining
•Split transactions
Burst Transfers
•First cycle of every MPC823 bus transaction transfers
address; minimum transaction is two cycles
•This limits data transfers to one word every other cycle
•We can beat this limit by transferring multiple words in one
transaction using one address cycle:
(Some additional control signals are required, not shown in the
diagram.)
•What fraction of bus cycles can we transfer data on now?
CLK
A[6:31]
D[0:31]
RD/WR
TS
A0
D1 D2?? ??
?? ??
?? ??
TA
D0 D3
