Difference between revisions of "IGEP0040HardwareRABugs"
From IGEP - ISEE Wiki
m (→BUG ALL_01: Missing 1V8 26MHz Oscillator) |
m (→BUG ALL_01: (IMPORTANT) Missing 1V8 26MHz Oscillator) |
||
Line 10: | Line 10: | ||
- Tested with oscilloscope VCXO_IN signal | - Tested with oscilloscope VCXO_IN signal | ||
+ | |||
+ | ---- | ||
+ | |||
+ | === BUG ALL_02: Marvell flat connector mounted === | ||
+ | |||
+ | '''WORKAROUND:''' Use a 1.27 mm header instead to allow get access to signals easier | ||
+ | |||
+ | - Mount JTAGB | ||
+ | |||
+ | - Umount JTAG | ||
+ | |||
+ | ---- | ||
+ | |||
+ | === BUG ALL_03: PRI_TRST is low, has no PU=== | ||
+ | |||
+ | '''WORKAROUND:''' Use PU resistor to V_1P8 to pull high this signal. This resistors should be added to Layout. '''Need to check if this bug is important''' | ||
+ | |||
+ | ---- | ||
+ | |||
+ | === BUG ALL_04: (IMPORTANT) Remove power bad resistors=== | ||
+ | |||
+ | '''INFO:''': This resistors disables power sequence from power switch and LDOs to PXA2128 | ||
+ | |||
+ | '''WORKAROUND:''' Disable this SMARC feature | ||
+ | |||
+ | - Umount: R971, R972, R973, R974 and R975 | ||
---- | ---- |
Revision as of 18:28, 6 August 2015
Contents
BUG ALL_01: (IMPORTANT) Missing 1V8 26MHz Oscillator
INFO:: This clock is not mounted at proto first assembly. It is necessary to enable some PLL and other PXA2128 clock subsystem.
WORKAROUND: Installed a 1V8 26MHz Oscillator with 50 ppm from "XTAL affaire box"
- Mount O1, R106, C276
RESULT:
- Tested with oscilloscope VCXO_IN signal
BUG ALL_02: Marvell flat connector mounted
WORKAROUND: Use a 1.27 mm header instead to allow get access to signals easier
- Mount JTAGB
- Umount JTAG
BUG ALL_03: PRI_TRST is low, has no PU
WORKAROUND: Use PU resistor to V_1P8 to pull high this signal. This resistors should be added to Layout. Need to check if this bug is important
BUG ALL_04: (IMPORTANT) Remove power bad resistors
INFO:: This resistors disables power sequence from power switch and LDOs to PXA2128
WORKAROUND: Disable this SMARC feature
- Umount: R971, R972, R973, R974 and R975