Intel
®
Atom™ Processor E660 with Intel
®
Platform Controller Hub EG20T Development Kit
January 2012
User Manual
Document Number: 324213-002
29
Getting Started
2.5.19
Real Time Clock
An on-board battery on the carrier board maintains power to the real time clock (RTC)
on the COM Express module when in mechanical off state (G3 state).
2.5.20
In-Target Probe (ITP) and Debug Support
The development kit provides on-board ITP support with an XDP connector on the COM
Express* Module. You can debug from the reset vector without EFI or OS dependency
(up to OS functionality). Ports 80-83 are provided as a troubleshooting tool to monitor
POST output during EFI execution.
ITP requires that the CMC be loaded to configure the Intel
®
Atom™ Processor E660
before register accesses can be made. The CMC code resides in the SPI flash on the
COM Express* module. The SPI flash must be programmed to use ITP.
Figure 9.
Clock Changing Circuit Diagram for the Intel
®
Platform Controller Hub EG20T
in the Carrier Board
USB_CLK
Intel® PCH
EG20T
SYSCLK
25.0MHz
SPXO
COMe*
Connector
100MHz
PCIe* CLK
Buffer
48MHz
SPXO
UART_CLK
1.8432MHz
SPXO
(DIP Socket)
SMB_CK/DAT
PCIe REFCLK_P/N
75.0MHz
LVDS_ICG
PCIe_CLKT
PCIe_CLKC
SATA_CLKT
SATA_CLKC
25MHz
X’tal
EMPTY(*)
IOH_EC_CLK
C77
N.C
IOH_USB_CLK
C83
IOH_SYS_CLK
C97
IOH_SATA_CLKJ_P
D64
IOH_SATA_CLKJ_N
D63
IOH_I2S_CLK
D83
N.C
22ohm(*)
22ohm
22ohm
EMPTY(*)
22ohm(*)
22ohm
R1a
R1b
R2a
R2b
R3a
R3b
D33VS
Cc
Cc
SATA CLK
Source
On board
LVDS_CG
COMe Module
CK505
R1a
22ohm
EMPTY
R1b
22ohm
EMPTY
R2a
EMPTY
/-10%
R2b
EMPTY
/-10%
R3a
EMPTY
5.6Kohm +/-10%
R3b
EMPTY
5.6Kohm +/-10%
Cc
EMPTY
0.1uF
(*) In the case to use the custom CK505 on the Little Bay
these resistors need to change mounting.