Intel DBPXA250 - Manual (Page 19)

DBPXA250 and DBPXA210 Development Platforms Specification Update 19
Intel
®
DCPXA250 Processor Card
9. Coin Cell Battery Issue
Problem: Specification change to BATT_VCC. Stop using the backup battery and connect BATT_VCC to
VCCQ.
Implication: VCCQ might attempt to charge battery if BATT_VCC is lower than VCCQ
Workaround: For Rev C boards:
1. Remove CR2032 coin cell battery from battery holder B1.
2. Remove the 0-ohm resistor R23B.
3. Install, on the bottom of the board, a 30-AWG wire between TP11 (red) and J8 pin 1 (VCCQ).
For Rev D boards:
1. Remove CR2032 coin cell battery from battery holder B1.
2. Remove the 0-ohm resistor R23B.
3. Install, on the bottom of the board, a 30-AWG wire between TP11 (red) and TP30 (red).
Status: Fixed
Board Rev: Rev C and D
10. Signal Integrity Problems On SDCLK
Problem: Signal integrity problems on SDCLK.
Implication: Unstable operation with 100-MHz SDCLK.
Workaround: For 100-MHz SDRAM development, Intel recommends using Rev F of the DCPXA250 processor
card in place of this procedure. Contact your local Intel representative for availability.
Use the following procedure to improve the SDCLK signal integrity.
1. Cut the trace exiting U10B, pin 38 on the bottom of the DCPXA250 processor card.
2. Update CPLD U4 with latest code. Refer to http://developer.intel.com for latest CPLD
updates. This adjusts the voltage (VCC) from +1.2 V to +1.4 V.
Status: Plan Fix
Board Rev: Rev C and D
Figure 11. U10B Trace Cut Pin 38