MAX 7000A Programmable Logic Device Data Sheet
Figure 4. MAX 7000A Parallel Expanders
Unused product terms in a macrocell can be allocated to a neighboring macrocell.
From
Previous
Macrocell
Preset
Product-
Term
Select
Matrix
Macrocell
Product-
Term Logic
Clock
Clear
Preset
Product-
Term
Select
Matrix
Macrocell
Product-
Term Logic
Clock
Clear
To Next
Macrocell
36 Signals 16 Shared
from PIA Expanders
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 7000A 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. Figure 5 shows how the PIA signals are routed
into the LAB. An EEPROM cell controls one input to a 2-input ANDgate,
which selects a PIA signal to drive into the LAB.
12
Altera Corporation
ALTERA [ ALTERA CORPORATION ]
