mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 385

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

Next, the banks selected by the general-purpose chip-select machine support an option to
output the CSx signal at different timings with respect to the external address bus. CSx can
be output in any of the following configurations:
This all depends, of course, on the value in the ACS field of the ORx register, plus an
additional cycle if the TRLX bit is set. The general-purpose chip-select machine allows you
to connect to devices that have long disconnect times on data by delaying new bus
transactions addressing other memory banks for additional clock cycles. Finally, the banks
selected to operate with the general-purpose chip-select machine support termination of an
external cycle by sensing the TA signal asserted by the addressed external slave. Refer
back to Table 15-2 for more information.
Figure 15-5 illustrates a basic connection between the MPC823 and a “static” memory
device. In this case, the CSx signal is connected directly to the CE signal of the memory
device. The WEx signals are connected to the respective W signal of the memory device in
which each WEx signal corresponds to a different data byte.
• Simultaneous with the external address
• One quarter of a clock later
• One half of a clock later
MPC823
Figure 15-5. GPCM Memory Device Interface
Freescale Semiconductor, Inc.
ADDRESS
For More Information On This Product,
DATA
WEx
CSx
OE
MPC823 REFERENCE MANUAL
Go to: www.freescale.com
ADDRESS
CE
OE
W
DATA
MEMORY
Memory Controller
15-29