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Data Sheet
ORCA Series 2 FPGAs
January 2003
32
Lattice Semiconductor
Programmable Input/Output Cells (continued)
5-2843(F).r8
Figure 26. PIC Architecture
DT
PA
PB
PC
PD
PXL[1]
PXL[0]
PX2[2]
PX2[3]
PX2[0]
PX2[1]
PX1[0]
PX1[1]
PX1[2]
PX1[3]
PXH[1]
PXH[2]
PXH[3]
PXH[0]
B
A
C
D
FE
G
Q
PXL[0]
PXL[1]
PX2[0]
PX2[1]
PX2[2]
PX2[3]
PX1[0]
PX1[1]
PX1[2]
PX1[3]
PXH[1]
PXH[2]
PXH[3]
PXH[0]
B
A
C
D
TS0
OUT0
IN0
DOUT0
TS1
OUT1
IN1
DOUT1
TS3
OUT3
IN3
DOUT3
TS2
OUT2
IN2
DOUT2
PIC DETAIL
BIDI3
F
O
N
O
LLDRV
M
I
L
J
K
N
D
C
P
Q
M
BIDIH3
BIDIH2
BIDIH1
BIDIH0
BIDI2
BIDI1
BIDI0
LLIN3
LLIN2
LLIN1
LLIN0
P
VXL[3]
VXL[2]
VXL[1]
VXL[0]
VX1[7]
VX1[6]
VX1[5]
VX1[4]
VX1[3]
VX1[2]
VX1[1]
VX1[0]
DOUT[3]
DOUT[2]
DOUT[1]
XSW[3]
XSW[2]
XSW[1]
XSW[0]
XSW[4]
DOUT[0]
CKT
VXH[3]
VXH[2]
VXH[1]
VXH[0]
VX4[7]
VX4[6]
VX4[5]
VX4[4]
PDINTB[3]
PDINTB[2]
PDINTB[1]
PDINTB[0]
VX4[3]
VX4[2]
VX4[1]
VX4[0]
PLC-PIC Routing Resources
There is no direct connection between the inter-PIC
lines and the PLC lines. All connections to/from the
PLC must be done through the connecting lines which
are perpendicular to the lines in the PIC. The use of
perpendicular and parallel lines will be clearer if the
are placed side by side. Twenty-nine lines in the PLC
can be connected to the 15 lines in the PIC.
Multiple connections between the PIC PX1 lines and
the PLC X1 lines are available. These allow buses
placed in any arbitrary order on the I/O pads to be
unscrambled when placed on the PLC X1 lines. Con-
nections are also available between the PIC PX2 lines
and the PLC X1 lines.
There are eight tridirectional (four TRIDI/four TRIDIH)
buffers in each PIC; they can do the following:
■
Drive a signal from an I/O pad onto one of the adja-
cent PLC’s XL or XH lines
■
Drive a signal from an I/O pad onto one of the two
PXL or four PXH lines in the PIC
■
Drive a signal from the PLC XL or XH lines onto one
of the two PXL or four PXH lines in the PIC
■
Drive a signal from the PIC PXL or PXH lines onto
one of the PLC XL or XH lines