MiTAC 8170 用户手册
122
8170 N/B MAINTENANCE
5.2 Intel 82845(Brookdale Memory Controller HUB)
AGP/PCISignals
Name
Type
Description
G_PAR
I/O
AGP
Parity:
During FRAME# Operations: This signal is driven by the MCH
when it acts as a FRAME#-based AGP initiator during address and
data phases for a write cycle, and during the address phase for a read
cycle. PAR is driven by the MCH when it acts as a FRAME#-based
AGP target during each data phase of a FRAME#-based AGP
memory read cycle. Even parity is generated across AD[31:0] and
G_C/BE[3:0]#.
During SBA and PIPE# Operation: This signal is not used during
SBA and PIPE# operation.
During FRAME# Operations: This signal is driven by the MCH
when it acts as a FRAME#-based AGP initiator during address and
data phases for a write cycle, and during the address phase for a read
cycle. PAR is driven by the MCH when it acts as a FRAME#-based
AGP target during each data phase of a FRAME#-based AGP
memory read cycle. Even parity is generated across AD[31:0] and
G_C/BE[3:0]#.
During SBA and PIPE# Operation: This signal is not used during
SBA and PIPE# operation.
Clocks, Reset, and Miscellaneous Signals
Name
Type
Description
BCLK
BCLK#
BCLK#
I
CMOS
Differential Host Clock In: These pins receive a differential host
clock from the external clock synthesizer. This clock is used by all of
the MCH logic that is in the host clock domain.
clock from the external clock synthesizer. This clock is used by all of
the MCH logic that is in the host clock domain.
66IN
I
CMOS
66 MHz Clock In: This pin receives a 66 MHz clock from the clock
synthesizer. This clock is used by AGP/PCI and hub interface clock
domains.
Note: That this clock input is 3.3 V tolerant.
synthesizer. This clock is used by AGP/PCI and hub interface clock
domains.
Note: That this clock input is 3.3 V tolerant.
SCK[11:0]
O
CMOS
System Memory Clocks (SDR): These signals deliver a
synchronized clock to the DIMMs. There are two per row.
synchronized clock to the DIMMs. There are two per row.
RSTIN#
I
CMOS
Reset In: When asserted, this signal asynchronously resets the MCH
logic. RSTIN# is connected to the PCIRST# output of the ICH2. All
AGP/PCI output and bi-directional signals will also three-state
compliant to PCI Rev 2.0 and 2.1 specifications.
Note: This input needs to be 3.3 V tolerant.
logic. RSTIN# is connected to the PCIRST# output of the ICH2. All
AGP/PCI output and bi-directional signals will also three-state
compliant to PCI Rev 2.0 and 2.1 specifications.
Note: This input needs to be 3.3 V tolerant.
TESTIN#
I
CMOS
Test Input: This pin is used for manufacturing and board level test
purposes.
Note: This signal has an internal pull-up resistor.
purposes.
Note: This signal has an internal pull-up resistor.
Voltage Reference and Power Signals
Name
Type
Description
HVREF
Ref
Host Reference Voltage: Reference voltage input for the data,
address, and common clock signals of the host AGTL+ interface.
address, and common clock signals of the host AGTL+ interface.
SDREF
Ref
SDRAM Reference Voltage: Reference voltage input for DQ, DQS,
RDCLKIN (SDR).
RDCLKIN (SDR).
HI_REF
Ref
Hub Interface Reference: Reference voltage input for the hub
interface.
interface.
AGPREF
Ref
AGP Reference: Reference voltage input for the AGP interface.
HLRCOMP
I/O
CMOS
Compensation for Hub Interface: This signal is used to calibrate
the hub interface I/O buffers. It is connected to a 40.2 . pull-up
resistor with 1% tolerance and is pulled up to VCC1_8.
the hub interface I/O buffers. It is connected to a 40.2 . pull-up
resistor with 1% tolerance and is pulled up to VCC1_8.
GRCOMP
I/O
CMOS
Compensation for AGP: This signal is used to calibrate buffers. It is
connected to a 40.2 . pull-down resistor with a 1% tolerance.
connected to a 40.2 . pull-down resistor with a 1% tolerance.
HRCOMP[1:0]
I/O
CMOS
Compensation for Host: These signals are used to calibrate the host
AGTL+ I/O buffers. Each signal is connected to a 24.9 . pull-down
resistor with a 1% tolerance.
AGTL+ I/O buffers. Each signal is connected to a 24.9 . pull-down
resistor with a 1% tolerance.
HSWNG[1:0]
I
CMOS
Host Reference Voltage: Reference voltage input for the
compensation logic.
compensation logic.
SMRCOMP
I/O
CMOS
System Memory RCOMP:
VCC1_5
1.5 V Power Input: These pins are connected to a 1.5 V power
source.
source.
VCC1_8
1.8 V Power Input Pins: These pins are connected to a 1.8 V power
source.
source.
VCCSM
SDRAM Power Input Pins: These pins are connected to a 3.3 V
power source for SDR.
power source for SDR.
VCCA[1:0]
PLL Power Input Pins: These pins provide power for the PLL.
VTT
AGTL+ Bus Termination Voltage Inputs: These pins provide the
AGTL+ bus termination.
AGTL+ bus termination.
VSS
Ground: The VSS pins are the ground pins for the MCH.
VSSA[1:0]
PLL Ground: The VSSA[1:0] pins are the ground pins for the PLL
on the MCH.
on the MCH.