EVB-VF522R3 Platform User’s Guide, Rev. 0, 11/2014
16
Freescale Semiconductor, Inc.
On-board memory
10 On-board memory
This section details configuration of the on-board memories:
•
DDR3 SRAM (U6)
•
QuadSPI Flash (U507 to U509)
•
SD card socket (P500)
10.1
DDR3 memory
•
A single 1 Gb (64Mx16) DDR3 memory chip in the 96-ball FBGA package (e.g. MT41J64M16 by
Micron Technology) is installed on the EVB.
•
It is powered from the above-mentioned (see
Section 4.2, “Switch-mode voltage regulator (U7)
1.5V power rail (along with the ballast transistor Q2).
•
A simple resistor divider is good enough to generate the 0.75V DDR3 reference (see
).
Figure 15. DDR3 0.75V reference supply
•
The EVB is laid out so that it needs no external termination resistors, which simplifies its design
and lowers power consumption.
•
DDR3 self-refresh (low-power) mode is supported even when Vybrid is in any of the LPSTOPx
modes, in which its I/Os are switched into a high-impedance mode. The on-board pull-up on
DDR_RESET and pull-down on DDR_CKE lines keep the DDR3 chip in self-refresh mode.
Table 5. Cortex debug header (P16)
Signal
Function
Pin No
Pin No
Function
Signal
3V3 VCC
(Debug VREF)
1
2
TMS
JTMS
GND
GND
3
4
TCLK
JTCLK
GND
GND
5
6
TDO
JTDO
---
Key
7
8
TDI
JTDI
---
---
9
10
nSRST
JTAG-RST
