Open Access
Introduction
1-5
ARM Development Board (ARM7TDMI Version)
Hardware Reference Guide
ARM DUI 0017C
PAL A
programmable array logic
(
PAL
) device is a example of
a
programmable logic device
(
PLD
). The PAL used on the ARM
Development Card is a PALCE22V10. This has up to 22 inputs,
ten outputs and ten programmable macrocells. As it is based on
electrically erasable (EE) technology, it is reprogrammable.
Using appropriate software (such as PALASM), the function of
this device may be changed by reprogramming in a standard
programmer.
PCMCIA The
Personal Computer Memory Card Association
(
PCMCIA
)
produces a specification that details an interface suitable for
connecting small boards (the size of credit cards) to larger host
systems. The name PCMCIA is generally used to describe these
cards, but its use has been superseded by the term PC card.
PLD A
programmable logic device
. See also PAL and FPGA.
PALASM A
programmable array logic assembler
(
PALASM
) is a low-cost,
proprietary logic description language produced by
Advanced
Micro Devices
(
AMD
) for their range of PLDs and CPLDs. It has
been used extensively in the design of the ARM Development
Card.
PLL A
phase-locked loop
(
PLL
) usually comprises a voltage
controller oscillator, programmable divider, frequency
comparator, and an integrator. These components allow a
programmable frequency clock to be generated. This is locked
to and stabilised by a reference clock input.
On the ARM Development Card, a single component performs
this function. A reference crystal at 14.318MHz is used, and with
three programmable inputs, the device is able to generate 8
output frequencies from about 4–50MHz.
VHDL VHDL is a hardware description language suitable for the
simulation and synthesis of logic circuits. The design for the
FPGA on the ARM Development Card was completed using
VHDL and synthesis tools from Compass. Xilinx tools were used
to place and route the design.
hrg.book Page 5 Wednesday, July 22, 1998 9:18 AM
To Next Page
Loading...
Need help?
General
