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854 Graphics Memory Controller Hub (GMCH)
32 D15343-003
3.3 Hub Interface Signals
Table 7. Hub Interface Signals
SMAB[5,4,2,1] O
SSTL_2
Memory Address Copies: These signals are identical to SMA[5,4,2,1]
and are used to reduce loading for selective CPC(clock-per-command).
These copies are not inverted.
SDM[8:0] O
SSTL_2
Data Mask: When activated during writes, the corresponding data
groups in the DDR SDRAM are masked. There is one SDM for every
eight data lines. SDM can be sampled on both edges of the data
strobes.
RCVENOUT# O
SSTL_2
Clock Output: Reserved, NC.
RCVENIN# O
SSTL_2
Clock Input: Reserved, NC.
Signal Name Type Description
HL[10:0] I/O Hub Packet Data: Data signals used for HI read and write operations.
HLSTB I/O Hub Packet Strobe: One of two differential strobe signals used to transmit or
receive packet data over HI.
HLSTB# I/O Hub Packet Strobe Complement: One of two differential strobe signals used
to transmit or receive packet data over HI.