January 2007
239
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
Intel
®
6300ESB Design Guidelines
Note:
V
BIAS
is also very sensitive to environmental conditions.
9.11.7
SUSCLK
SUSCLK is a square waveform signal output from the RTC oscillation circuit. Depending on the
quality of the oscillation signal on RTCX1 (largest voltage swing), the SUSCLK duty cycle may be
between 30-70%. When the SUSCLK duty cycle is beyond 30-70% range, it indicates a poor
oscillation signal on RTCX1 and RTCX2.
SUSCLK may be probed directly using normal probe (50
Ω
input impedance probe). It is an
appropriated signal you may use to check the RTC frequency to determine the accuracy of the
6300ESB’s RTC Clock (see Application Note AP-728 for further details).
9.11.8
RTC-Well Input Strap Requirements
All RTC-well inputs (RSMRST#, RTCRST#, INTRUDER#) must be either pulled up to V
CC
RTC
or pulled down to ground while in G3 state. RTCRST# when configured as shown in
meets this requirement. RSMRST# should have a weak external pull-down to ground and
INTRUDER# should have a weak external pull-up to V
CC
RTC. This prevents these nodes from
floating in G3, and correspondingly prevents I
CC
RTC leakage that may cause excessive coin-cell
drain. The PWROK input signal should also be configured with an external weak pull-down.
9.12
Serial I/O
The 6300ESB supports two Serial I/O ports. For proper functionality of the Serial I/O ports ensure
the clock input (UART_CLK) has the correct value.
System designers have two options for the input clock:
•
48 MHz -Recommended
•
14.745 MHz
Warning:
If using the 14.745 MHz option, ensure it is
14.745
MHz. Any deviation from this value, such as
using a common system clock (14.318 MHz), will cause improper functioning of the Serial I/O.
Note:
A 48 MHz clock input is the recommended value to ease system design. A CK409 has an 48 MHz
clock available so no other clock source for the Serial I/O would be necessary.
9.12.1
Serial I/O Interface Not Utilized
When the Serial I/O is not utilized in the system, all associated pins may be left as No Connect.
Note:
SIU_DTR# is a strap pin. To utilize the strap feature (TOP Swap) a pull-down to ground is
necessary. Refer to the 6300ESB Datasheet for more details.
Содержание 6300ESB ICH
Страница 24: ...24 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Introduction...
Страница 36: ...36 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide General Design Considerations...
Страница 102: ...102 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide...
Страница 122: ...122 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide...
Страница 152: ...152 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide System Memory Design Guidelines DDR SDRAM...
Страница 172: ...172 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Integrated Graphics Display Port...
Страница 190: ...190 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Hub Interface...
Страница 246: ...246 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Intel 6300ESB Design Guidelines...
Страница 264: ...264 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Platform Clock Routing Guidelines...
Страница 298: ...298 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Schematic Checklist Summary...
Страница 318: ...318 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Layout Checklist...