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Figure 15-7 illustrates the basic connection between the MPC823e and an external
peripheral device. In this case, CSx is connected directly to the CE signal of the memory
device and the R/W signal is connected to the respective R/W signal in the peripheral
device. The CSx signal is the strobe output for the memory access.
MEMORY
Figure 15-7. GPCM Peripheral Device Interface
Figure 15-8 illustrates the CSx signal as defined by the setup time required between the
address lines and the CE signal. The MPC823e memory controller allows you to specify the
CSx signal to meet this requirement using the ACS field of the option register.
CLOCK
ADDRESS
TS
TA
CSx
R/W
DATA
Figure 15-8. GPCM Peripheral Device Basic Timing (ACS = 10 or 11 and TRLX = 0)
MOTOROLA
ADDRESS
CSx
R/W
DATA
MPC823e REFERENCE MANUAL
Memory Controller
PERIPHERAL
ADDRESS
CE
R/W
DATA
ACS = 10
ACS = 11
15-31
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