today, i was able to find a bug where a LPC2214/01 run at 60Mhz showed irrational behavior in his SSP-Interface. I was trying to get a 30MHz SPI working with a Peripheral IC. (Design is a 4 layer layout, short traces, decoupling etc. with all the bells and whistles)
The signals looked quite ok on the scope, but the SSP-Interface read only gibberish, or even just zeroes (8 Bit Transfer).
At 15Mhz or lower, all worked just fine.
I got a hint by a colleague, who told me he had read about a issue with an LPC2103 in the dedicated errata sheet, about the devices not working properly when consuming much energy at high frequencies on the 1V8 Rail. (http://www.nxp.com/documents/errata_sheet/ES_LPC2103.pdf -> 3.7 Page 9
In this Errata, NXP suggests to increase the 1V8Rail to 1.95V or thereabout. I have found this Workaround (Increase 1V8 to 1.96V and disabling unused peripherals) to fix my Problem with the device. Even though i cant tell for sure we havent screwed something up with the layout, i consider this beeing worth a note. Maybe someone can even confirm or reject this, so we may get a hint for further users in the errata. Next, i will be checking my designs with LPC 2124 for this.
