LFXP6C-4TN144C Lattice, LFXP6C-4TN144C Datasheet - Page 223

• Manufacturer Part Number: LFXP6C-4TN144C
• Description: IC FPGA 5.8KLUTS 100I/O 144-TQFP
• Manufacturer: Lattice

Specifications of LFXP6C-4TN144C

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Lattice Semiconductor
Figure 10-4. DQ-DQS Grouping
Figure 10-4 shows a typical DQ-DQS group for both the LatticeECP/EC device and the LatticeXP device. The ninth
I/O of this group of 16 I/Os (for LatticeECP/EC) or 14 I/Os (for LatticeXP) is the dedicated DQS pin. All eight pads
before the DQS and seven (for LatticeECP/EC) or four (for LatticeXP) pads after the DQS are covered by this DQS
bus span. The user can assign any eight of these I/O pads to be DQ data pins. Hence, to implement a 32-bit wide
memory interface you would need to use four such DQ-DQS groups.
When not interfacing with the memory, the dedicated DQS pin can be used as a general purpose I/O. Each of the
dedicated DQS pin is internally connected to the DQS phase shift circuitry. The pinout information contained in the
LatticeECP/EC and LatticeXP device data sheets shows pin locations for the DQS pads. Table 10-2 shows an
extract from the LatticeECP/EC data sheet. In this case, the DQS is marked as LDQS6 (L=left side, 6 =associated
PFU row/column). Since DQS is always the fifth true pad in the DQ-DQS group, counting from low to high PFU
row/column number, LDQS6 will cover PL2A to PL9B. Following this convention, there are eight pads before and
seven pads after DQS for DQ available following counter-clockwise for the left and bottom sides of the device, and
following clockwise for the top and right sides of the device. The user can assign any eight of these pads to be DQ
data signals. The LatticeXP device follows the same method.
Table 10-3. EC20 Pinout (from LatticeECP/EC Family Data Sheet)
Ball Function
PL11A
PL2A
PL2B
PL3A
PL3B
PL4A
PL4B
PL5A
PL5B
PL6A
PL6B
PL7A
PL7B
PL8A
PL8B
PL9A
PL9B
*For LatticeECP/EC: n = 16, for LatticeXP: n = 14.
Bank
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
LVDS
C
C
C
C
C
C
C
C
T
T
T
T
T
T
T
T
T
(Ninth I/O Pad)
n* I/O PADS
DQS PAD
10-4
LUM0_PLLC_FB_A
LUM0_PLLT_FB_A
LUM0_PLLC_IN_A
LUM0_PLLT_IN_A
Dual Function
VREF2_7
VREF1_7
LDQS6
—
—
—
—
—
—
—
—
—
—
DQ, DM or VREF1
LatticeECP/EC and LatticeXP
484 fpBGA
G4
G5
D4
E4
C3
B2
E5
D3
C2
E3
D2
B1
C1
E2
F5
F4
F3
DDR Usage Guide
672 fpBGA
G3
G2
G6
H4
G4
E3
E4
B1
C1
F3
D2
E2
D1
E1
F2
F6
J4