[gta02-core] [PATCH] New ECN: Insert 0R resistors into SPI signals

Rask Ingemann Lambertsen ccc94453 at vip.cybercity.dk
Sat Sep 5 20:04:41 CEST 2009

Index: docs/ecn/STATUS
--- docs/ecn/STATUS	(revision 5604)
+++ docs/ecn/STATUS	(working copy)
@@ -38,6 +38,7 @@
 0036    Discuss Removal of decoupling capacitor C3020
 0037    Discuss Route ROUT1/LOUT1 back to LINE1/LINE2 input
 0038    Discuss Loudspeaker EMI filter
+0039	Discuss	Insert 0R resistors into SPI signals
 Open ECNs
@@ -62,3 +63,4 @@
 0036    AUDIO
 0037    AUDIO
 0038    AUDIO
+0039	CPU, LCM

--- /dev/null	2009-08-16 19:25:44.824052888 +0200
+++ docs/ecn/ecn0039.txt	2009-09-05 19:37:09.000000000 +0200
@@ -0,0 +1,33 @@
+Insert 0R resistors into SPI signals
+The SC32442B SPI interface running at 13 MHz or faster has timing problems[1]
+that we might need to patch up externally. Following ECN0001 (Glamo removal)
+and ECN0034 the SPI interface exposed at the debug connector will now be routed
+to the alternative SPI1 pins of the LCD interface. There is some uncertainty
+about the SPICLK1 signal there[2]. Finally, the SPI1 pins currently routed to the
+accelerometer have EINT capability while the debug connector ones do not, so to
+make better use of EINT pins, we should find out if the two sets of SPI pins can
+be swapped.
+The change is to insert a 0R resistor into all the SPI signals:
+Impact: We won't likely have enough 0R resistors supplied by OM and therefore
+need to buy some.
+[1] https://lists.openmoko.org/pipermail/openmoko-kernel/2008-September/005261.html
+[2] https://lists.openmoko.org/pipermail/gta03/2009-May/000210.html
+Author: Rask Ingemann Lambertsen <ccc94453 at vip.cybercity.dk>

Rask Ingemann Lambertsen
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