MicroBlaze Development Kit Spartan-3E 1600 Edition User Guide
105
UG257 (v1.1) December 5, 2007
www.xilinx.com
R
Chapter 13
DDR SDRAM
The MicroBlaze Development Kit board includes a 512 Mbit (32M x 16) Micron Technology
DDR SDRAM (MT46V32M16) with a 16-bit data interface, as shown in
Figure 13-1
. All
DDR SDRAM interface pins connect to the FPGA’s I/O Bank 3 on the FPGA. I/O Bank 3
and the DDR SDRAM are both powered by 2.5V, generated by an LTC3412 regulator from
the board’s 5V supply input. The 1.25V reference voltage, common to the FPGA and DDR
SDRAM, is generated using a resistor voltage divider from the 2.5V rail.
All DDR SDRAM interface signals are terminated.
Figure 13-1:
FPGA Interface to Micron 512 Mbit DDR SDRAM
UG257_1
3
_01_060806
S
ee T
ab
le
S
D_A<12:0>
(C1)
S
p
a
rt
a
n-
3
E FPGA
S
D_DQ<15:0>
S
D_BA<1:0>
S
D_RA
S
A[12:0]
BA[1:0]
DQ[15:0]
RA
S
#
Micron 512 M
b
DDR
S
DRAM
S
D_CA
S
S
D_WE
S
D_CK_P
S
D_CK_N
S
D_CKE
S
D_C
S
S
D_LDM
S
D_UDM
S
D_UDQ
S
S
D_LDQ
S
S
D_CK_FB
CA
S
#
WE#
UQM
LQM
UDQ
S
LDQ
S
C
S
#
CK
CK#
CKE
S
ee T
ab
le
S
ee T
ab
le
(C2)
(D1)
(J1)
(J2)
(G
3
)
(L6)
(K4)
(K
3
)
(J4)
(J5)
(B9) GCLK9
VREF
VCCO_
3
5.0V
LTC
3
412
VREF
VDD
VDDQ
2.5V
1.25V
MT46V
3
2M16
(
3
2Mx16)