QG82945GSE S LB2R Intel, QG82945GSE S LB2R Datasheet - Page 41

• Manufacturer Part Number: QG82945GSE S LB2R
• Description: GRAPHICS AND MEM CNTRL HUB; No. of Pins: 998; Package / Case: FCBGA; Interface Type: PCI, SATA, USB
• Manufacturer: Intel

Signal Description
2.2.2
Note:
Datasheet
DDR2 SDRAM Channel B Interface
The Ultra Mobile Intel 945GU Express Chipset does not support Channel B. These
signals are Not on the Ultra Mobile Intel 945GU Express Chipset.
SB_DQ[63:0]
SB_DM[7:0]
SB_DQS[7:0]
SB_DQS[7:0]#
SB_MA[13:0]
SB_BS[2:0]
SB_RAS#
SB_CAS#
Signal Name
SSTL1.8
SSTL1.8
SSTL1.8
SSTL1.8
SSTL1.8
SSTL1.8
SSTL1.8
SSTL1.8
Type
I/O
I/O
I/O
2x
2X
2x
2x
O
O
O
O
O
Data Lines:
DDR / DDR2 Channel B data signal interface to the
SDRAM data bus.
Note: These signals do not exist on the Mobile Intel®
945GMS/GSE Express Chipset.
Data Mask:
When activated during writes, the corresponding data
groups in the SDRAM are masked. There is one
SB_DM[7:0] for every data byte lane. These signals are
used to mask individual bytes of data in the case of a
partial write, and to interrupt burst writes.
Note: These signals do not exist on the Mobile Intel
945GMS/GSE Express Chipset.
Data Strobes:
DDR2: SB_DQS[7:0] and its complement signal group
make up a differential strobe pair. The data is captured at
the crossing point of SB_DQS[7:0] and its SB_DQS[7:0]#
during read and write transactions.
Note: These signals do not exist on the Mobile Intel
945GMS/GSE Express Chipset.
Data Strobe Complements:
These are the complementary strobe signals.
Note: These signals do not exist on the Mobile Intel
945GMS/GSE Express Chipset.
Memory Address:
These signals are used to provide the multiplexed row and
column address to the SDRAM.
Note: SB_MA13 is for support of 1-Gb devices.
Bank Select:
These signals define which banks are selected within each
SDRAM rank.
RAS Control Signal:
Used with SB_CAS# and SB_WE# (along with SM_CS#)
to define the SDRAM commands.
CAS Control Signal:
Used with SB_RAS# and SB_WE# (along with SM_CS#)
to define the SDRAM commands.
(Sheet 1 of 2)
Description
41