參數(shù)資料
型號(hào): 82803AAMRH-R
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器雜項(xiàng)-數(shù)據(jù)表參考
文件頁數(shù): 29/52頁
文件大?。?/td> 322K
代理商: 82803AAMRH-R
82803AA MRH-R
R
Datasheet
29
4.1.2.4.
Thermal Sensor Read
RDRAM devices report their thermal sensor status on DQA[5] during a current calibrate cycle. The
MRH-R simply treats this as read data and passes the data back to the MCH with read data levelization.
Refer to Rambus* Technical Documentation for more information.
4.1.2.5.
Temperature Calibration
In addition to the current calibration, all RDRAM devices on the ‘stick’ channels must be temperature
calibrated. The temperature calibration is accomplished through the CMOS interface signals on the
‘stick’ channels. The MCH issues an EXP0 packet with a temperature calibration command to the
specified channel. After receiving this command, the MRH-R issues a Temperature Calibrate Enable
command followed immediately by a Temperature Calibrate command via the CMOS interface signals to
the RDRAM channel. Refer to Rambus* Technical Documentation for detailed information.
4.1.3.
CMOS Protocol
4.1.3.1.
Overview
The CMOS protocol on the MRH-R Direct RDRAM ‘Stick’ Channels is used for RDRAM initialization,
RDRAM register reads, RDRAM register writes, and RDRAM power mode exit control.
The CMOS protocol on the ‘expansion’ channel is used for MRH-R initialization, MRH-R register
reads, MRH-R register writes, and SPD EEPROM reads/writes. For interfacing to the SPD EEPROMs
on the RIMMs, there are two additional CMOS signals (SMBDATA, SMBCLK) provided from the
MRH-R. These CMOS signals are not considered to be part of ‘expansion’ channel.
The connection of CMOS signals between the MCH, MRH-R, and RDRAM channels is illustrated in
Figure 3 below.
Note:
This figure depicts the connectivity on one Intel
82840 MCH Direct RDRAM channel. A second
channel exists, so the same implementation is required on the second channel.
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