PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 164
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PSB21473FV13XT
Manufacturer Part Number
PSB21473FV13XT
Description
Manufacturer
Infineon Technologies
Datasheet
1.PSB21473FV13XT.pdf
(664 pages)
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
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INCA-D
PSB 21473
The External Bus Interface
•
Figure 11-4 Switching from Demultiplexed to Multiplexed Bus Mode
The bus cycle is described in number of TCL’s, where f
= 1/(2 TCL).
CPU
External Data Bus Width
The EBC can operate on 8-bit or 16-bit wide external memory/peripherals. A 16-bit data
bus uses PORT0, while an 8-bit data bus only uses P0L, the lower byte of PORT0. This
saves on address latches, bus transceivers, bus routing and memory cost on the
expense of transfer time. The EBC can control word accesses on an 8-bit data bus as
well as byte accesses on a 16-bit data bus.
Word accesses on an 8-bit data bus are automatically split into two subsequent byte
accesses, where the low byte is accessed first, then the high byte. The assembly of bytes
to words and the disassembly of words into bytes is handled by the EBC and is
transparent to the CPU and the programmer.
Byte accesses on a 16-bit data bus require that the upper and lower half of the memory
can be accessed individually. In this case the upper byte is selected with the BHE signal,
while the lower byte is selected with the A0 signal. So the two bytes of the memory can
be enabled independent from each other, or together when accessing words.
When writing bytes to an external 16-bit device, which has a single CS input, but two WR
enable inputs (for the two bytes), the EBC can directly generate these two write control
signals. This saves the external combination of the WR signal with A0 or BHE. In this
Data Sheet
164
2003-03-31
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