Actel ProASIC3/E, User Manual, Page: 71 / 106

ProASIC3/E Starter Kit User’s Guide and Tutorial 71
A
PQ208 Package Connections for A3PE600 and
A3P250 Devices
Due to the comprehensive and flexible nature of ProASIC3 device user I/Os, a naming scheme is used to show the
details of the I/O. The name identifies to which I/O bank it belongs, as well as the pairing and pin polarity for
differential I/Os.
Figure A-1 on page 72 and Table A-1 on page 72 are extracted from the ProASIC3 and ProASIC3E datasheets and
provide package connections for the A3P250 and A3E600 devices. Pinouts for other devices in the PQ208 family may
be found on the Actel website:
ProASIC3 Flash Family FPGAs datasheet at www.actel.com/documents/PA3_DS.pdf
ProASIC3E Flash Family FPGAs datasheet at www.actel.com/documents/PA3E_DS.pdf
These datasheets are included on the ProASIC3 and ProASIC3E Starter Kit CD. However, the website should always
be referenced for access to the most recent datasheet.
I/O Nomenclature = Gmn/IOuxwBy
Gmn is only used for I/Os that also have CCC access – i.e., global pins.
G = Global
m = Global pin location associated with each CCC on the device: A (northwest corner), B
(northeast corner), C (east middle), D (southeast corner), E (southwest corner), and F (west
middle)
n = Global input MUX and pin number of the associated Global location m, either A0, A1,A2,
B0, B1, B2, C0, C1, or C2
u = I/O pair number in the bank, starting at 00 from the northwest I/O bank in a clockwise
direction
x = P (Positive) or N (Negative) for differential pairs, or S (Single-Ended) for the I/O that
support single-ended and voltage-referenced I/O standards only
w = D (Differential Pair) or P (Pair) or S (Single-Ended). D (Differential Pair) if both members
of the pair are bonded out to adjacent pins or are separated only by one GND or NC pin; P
(Pair) if both members of the pair are bonded out but do not meet the adjacency
requirement; or S (Single-Ended) if the I/O pair is not bonded out. For Differential (D)
pairs, adjacency for ball grid packages means only vertical or horizontal. Diagonal adjacency
does not meet the requirements for a true differential pair.
B = Bank
y = Bank number [0..3] for ProASIC3 and [0..7] for ProASIC3E. Bank number starting at 0
from the northwest I/O bank in a clockwise direction