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Signal Description
66 Datasheet, Volume 1
6.1 System Memory Interface Signals
Table 6-2. Memory Channel A Signals
Signal Name Description
Direction/
Buffer Type
SA_BS[2:0]
Bank Select: These signals define which banks are selected within
each SDRAM rank.
O
DDR3
SA_WE#
Write Enable Control Signal: This signal is used with SA_RAS# and
SA_CAS# (along with SA_CS#) to define the SDRAM Commands.
O
DDR3
SA_RAS#
RAS Control Signal: This signal is used with SA_CAS# and SA_WE#
(along with SA_CS#) to define the SRAM Commands.
O
DDR3
SA_CAS#
CAS Control Signal: This signal is used with SA_RAS# and SA_WE#
(along with SA_CS#) to define the SRAM Commands.
O
DDR3
SA_DQS[8:0]
SA_DQS#[8:0]
Data Strobes: SA_DQS[8:0] and its complement signal group make
up a differential strobe pair. The data is captured at the crossing point
of SA_DQS[8:0] and its SA_DQS#[8:0] during read and write
transactions.
I/O
DDR3
SA_DQ[63:0]
Data Bus: Channel A data signal interface to the SDRAM data bus. I/O
DDR3
SA_MA[15:0]
Memory Address: These signals are used to provide the multiplexed
row and column address to the SDRAM.
O
DDR3
SA_CK[3:0]
SA_CK#[3:0]
SDRAM Differential Clock: Channel A SDRAM Differential clock signal
pair. The crossing of the positive edge of SA_CK and the negative edge
of its complement SA_CK# are used to sample the command and
control signals on the SDRAM.
O
DDR3
SA_CKE[3:0]
Clock Enable: (1 per rank). These signals are used to:
• Initialize the SDRAMs during power-up.
•Power down SDRAM ranks.
• Place all SDRAM ranks into and out of self-refresh during STR.
O
DDR3
SA_CS#[3:0]
Chip Select: (1 per rank). These signals are used to select particular
SDRAM components during the active state. There is one Chip Select
for each SDRAM rank.
O
DDR3
SA_ODT[3:0]
On Die Termination: Active Termination Control. O
DDR3