PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 169

• Manufacturer Part Number: PSB21473FV13XT
• Manufacturer: Infineon Technologies

Specifications of PSB21473FV13XT

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 144
• Lead Free Status / RoHS Status: Compliant

INCA-D
PSB 21473
The External Bus Interface
ALE Length Control
The length of the ALE signal and the address hold time after its falling edge are
controlled by the ALECTLx bits in the BUSCON registers. When bit ALECTL is set to ‘1’,
external bus cycles accessing the respective address window will have their ALE signal
prolonged by half a CPU clock. Also the address hold time after the falling edge of ALE
(on a multiplexed bus) will be prolonged by half a CPU clock, so the data transfer within
a bus cycle refers to the same CLKOUT edges as usual (ie. the data transfer is delayed
by one CPU clock). This allows more time for the address to be latched.
Note: ALECTL0 is ‘1’ after reset to select the slowest possible bus cycle, the other
ALECTLx are ‘0’ after reset.
Figure 11-6 ALE Length Control
Programmable Memory Cycle Time
The INCA-D allows the user to adjust the controller's external bus cycles to the access
time of the respective memory or peripheral. This access time is the total time required
Data Sheet
169
2003-03-31