Motorola MPC8260 User Manual

8-10

MOTOROLA

During the address transfer, the address is placed on the address signals, A[0Ð31]. The bus
master provides other signals that characterize the address transferÑtransfer type (TT[0Ð
4]), transfer code (TC[0Ð2]), transfer size (TSIZ[0Ð3]), and transfer burst (TBST) signals.
These signals are discussed in the following sections.

The transfer type signals deÞne the nature of the transfer requested. They indicate whether
the operation is an address-only transaction or whether both address and data are to be
transferred. Table 8-2 describes the MPC8260Õs action as master, slave, and snooper.

00000

Clean block

Address 
only

Address only (if 
enabled)

dcbst (if enabled)

Not applicable 
to MPC8260

AACK asserted; 
MPC8260 takes no 
further action. 

00100

Flush block

Address 
only

Address only (if 
enabled)

dcbf (if enabled)

Not applicable 
to MPC8260

AACK is asserted; 
MPC8260 takes no 
further action.

CLKOUT

ADDR + ATTR

TS

AACK

DBG

TA

Address

Data Tenure

 Tenure

Address 1

Data 1

Address 2

Data 2