110118-0001A
65
7 Board Revision History
7.1
Identifying the board revision
The product revision number of the BitsyXb is etched on the underside of the printed circuit
board. That number is 170118-0000x, where "x" is the board revision.
7.2
Revision History
This section describes the differences between the revisions of the Bitsy Xb.
7.2.1
Revision 4
Initial release
If you are using a BitsyXb as a replacement for the BitsyX, please note these differences from
revision C of the BitsyX.
New Features
PXA270 processor replaces PXA255.
Adds header J11 for external supercapacitors.
Adds header J8 for off-board Vee Generator.
Changes
In-system programming and test signals from headers J4 and J5 merge into J16.
System controller CPLD replaces SA-1111 for PCMCIA/CF control.
PXA270 replaces SA-1111 for SPI and USB Host functionality.
LCD power select shunt JP3 changes to JP2.
Removes JP4 for Vee polarity (now found on Vee adapter board).
Bottom-side clearance is slightly higher, increasing overall enclosure height by 0.7mm (from
0.728 to 0.759 inches).
MMC signals on J7 change as follows:
Pin
From
To
8
MMCDAT
MMCDAT0
13
/CS_4 GPIO80
/MMCWP
14
/CS_5 GPIO33
/MMC_IRQ
15
CPLD_IO
/MMCPWREN
16
n/c
MMCDAT1
Adds series resistance to SSP lines on J3.
Signals on Compact Flash interface, J9, change as follows:
Pin
From
To
26
CARDBVCC
n/c
