Motorola MPC823e Reference Manual page 322

A typical single beat transfer assumes that the external memory has a 32-bit port size. The
MPC823e provides an effective mechanism for interfacing with 16-bit port size memories
and 8-bit port size memories, thus allowing transfers to these devices when they are
controlled by the internal memory controller. The port size (PS) timing shown in the following
figures is representative of the PS field, which is described in Section 15.3.1.1 Base
Registers .
CLKOUT
BR
BG
BB
A[6:31]
RD/WR
TSIZ[0:1]
BURST
TS
STS
DATA
TA
PS
Figure 13-9. Single Beat, 32-Bit Data, Write Cycle From a 16-Bit Port Size
MOTOROLA
A
'00'
ABCDEFGH
'10'
MPC823e REFERENCE MANUAL
External Bus Interface
A + 2
'10'
EFGHEFGH
13-15