EW31244SL7QV Datasheet, PDF (29/252 Pages) Intel Corporation – Intel® 31244 PCI-X to Serial ATA Controller

Intel^® 31244 PCI-X to Serial ATA Controller
Overview
2.6
Serial EEPROM Interface
In add-in card applications, firmware may be downloaded to the system from a Serial EEPROM or
Serial Flash ROM via the GD31244. This industry standard 4-pin interface known as SPI, allows
any size of device to be connected to the GD31244 up to 128 KBytes. A typical firmware device is
STMicroelectronics M25P10-A.
2.7
Table 7.
Table 8.
Extended Voltage Mode
The SATA voltages were designed primarily for a cable connection to the hard drives. In certain
applications, such as NAS/SAN enclosures, the hard disk drives (HDD) are connected to a
backplane, not a cable (typically in desktop systems). Due to the frequency of the SATA interface,
the backplane creates a significant attenuation of the SATA signals. In an effort to simplify system
designs, the GD31244 offers an extended voltage range to help alleviate this issue. This extended
voltage range allows standard SATA HDD to be used with SATA backplanes. The firmware may be
place into the External Voltage Mode by setting bit 14 in PHY Configuration Register Address
140H to 1. This forces the firmware to operate with this extended voltage range.
Normal Voltage Mode
Parameter
Description
OUT
IN
TX output differential peak-to-peak voltage swing
RX input differential peak-to-peak voltage swing
Minimum
400
325
Maximum
600
600
Units
mVp-p
mVp-p
Extended Voltage Mode
Parameter
Description
OUT
TX output differential peak-to-peak voltage swing
IN
RX input differential peak-to-peak voltage swing
Minimum Maximum
800
2000
175
2000
Units
mVp-p
Developer’s Manual
April 2004
29