epm3064a Altera Corporation, epm3064a Datasheet - Page 10

• Manufacturer Part Number: epm3064a
• Description: Programmable Logic Device Family
• Manufacturer: Altera Corporation

MAX 3000A Programmable Logic Device Family Data Sheet
Figure 4. MAX 3000A Parallel Expanders
10
Unused product terms in a macrocell can be allocated to a neighboring macrocell.
36 Signals
from PIA
Expanders
16 Shared
Programmable Interconnect Array
Logic is routed between LABs on the PIA. This global bus is a
programmable path that connects any signal source to any destination on
the device. All MAX 3000A dedicated inputs, I/O pins, and macrocell
outputs feed the PIA, which makes the signals available throughout the
entire device. Only the signals required by each LAB are actually routed
from the PIA into the LAB.
into the LAB. An EEPROM cell controls one input to a two-input AND gate,
which selects a PIA signal to drive into the LAB.
Product-
Product-
Select
Matrix
Select
Matrix
Ter
T T m
er
Macrocell
Previous
From
Figure 5
shows how the PIA signals are routed
Macrocell
To Next
Preset
Clock
Clear
Preset
Clock
Clear
Altera Corporation
Macrocell
Product-
Term Logic
Macrocell
Product-
Term Logic