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A8255 Datasheet

  • A8255

  • PROGRAMMABLE PERIPHERAL INTERFACE ADAPTER

  • 13頁

  • ALTERA   ALTERA

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a8255
廬
Programmable Peripheral
Interface Adapter
September 1996, ver. 1
Features
s
s
s
s
s
s
s
s
a8255
MegaCore function implementing a programmable
peripheral interface adapter
Optimized for FLEX
廬
and MAX
廬
architectures
24 programmable inputs/outputs
Static read/write or handshaking modes
Direct bit set/reset capability
Synchronous design
Uses approximately 194 FLEX logic elements (LEs)
Functionally based on the Intel 8255A and Harris 82C55A devices,
except as noted in the
鈥淰ariations & Clarifications鈥?section on
page 56
General
Description
The
a8255
MegaCore function implements a programmable peripheral
interface adapter (see
Figure 1).
The
a8255
has 24 I/O signals that can be
programmed in two groups of 12. This MegaCore function operates in the
following three modes:
s
s
s
Mode 0: Basic Input/Output鈥擯ort
A, port B, and port C (upper and
lower) can be independently configured as inputs or outputs to read
or hold static data. Outputs are registered; inputs are not registered.
Mode 1: Strobed Input/Output鈥擯ort
A and port B can be
independently configured as strobed input or output buses. Signals
from port C are dedicated as control signals for data handshaking.
Mode 2: Bidirectional Bus鈥擯ort
A can be configured as a bidirectional
bus with the majority of port C providing the control signals. In this
configuration, port B can still implement mode 0 or mode 1.
Figure 1. a8255 Symbol
A8255
CLK
nCS
nRD
nWR
RESET
A[1..0]
DIN[7..0]
PAin[7..0]
PBin[7..0]
PCin[7..0]
PAEN
PBEN
DOUT[7..0]
PAOUT[7..0]
PBOUT[7..0]
PCEN[7..0]
PCOUT[7..0]
Altera Corporation
A-DS-A8255-01
45

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