January 2007
195
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
Intel
®
6300ESB Design Guidelines
Grounding: Provide a direct low impedance chassis path between the motherboard ground and
hard disk drives.
9.3
Cable Detection for Ultra ATA/66 and Ultra ATA/100
The 6300ESB IDE Controller supports PIO, Multi-word (8237 style) DMA, and Ultra DMA
modes 0 through 5, and Native Mode IDE. Please note that there are no motherboard hardware
requirements for supporting Native Mode IDE. Native Mode IDE is supported through the
operating system and system drivers. The 6300ESB needs to determine the type of cable that is
present, in order to configure itself for the fastest possible transfer mode that the hardware may
support.
An 80-conductor IDE cable is required for Ultra DMA modes greater than two (Ultra ATA/33).
This cable uses the same 40-pin connector as the old 40-pin IDE cable. The wires in the cable
alternate: ground, signal, ground, signal, ground, signal, ground. All the ground wires are tied
together on the cable (and they are tied to the ground on the motherboard through the ground pins
in the 40-pin connector). This cable conforms to the Small Form Factor Specification SFF-8049.
This specification may be obtained from the Small Form Factor Committee.
To determine when Ultra DMA modes greater than two (Ultra ATA/33) may be enabled, the
6300ESB requires the system software to attempt to determine the cable type used in the system.
When the system software detects an 80-conductor cable, it may use any Ultra DMA mode up to
the highest transfer mode supported by both the chipset and the IDE device. When a 40-conductor
cable is detected, the system software must not enable modes faster than Ultra DMA Mode 2 (Ultra
ATA/33).
Intel recommends that cable detection be performed using a combination Host-Side/Device-Side
detection mechanism. Note that Host-Side detection cannot be implemented on an NLX form
factor system, since this configuration does not define interconnect pins for the PDIAG#/CBLID#
from the riser (containing the ATA connectors) to the motherboard. These systems must rely on the
Device-Side Detection mechanism only.
9.3.1
Combination Host-Side/Device-Side Cable Detection
Host-side detection (described in the ATA/ATAPI-6 Standard) requires the use of two GPI pins (one
for each IDE channel). The proper way to connect the PDIAG#/CBLID# signal of the IDE
connector to the host is shown in
. All IDE devices have a 10 K
Ω
pull-up resistor to 5 V
on this signal. A 10 K
Ω
pull-down resistor on PDIAG#/CBLID# is required to prevent the GPIO
from floating if a device is not present and allows for use of a non-5 V tolerant GPIO.
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...