MV78100
Hardware Specifications
Table 5: DDR SDRAM Interface Pin Assignments (Continued)
Pin Name
I/O
Pin Type
Power
Rail
Description
M_CB[7:0]
t/s
I/O
SSTL
VDD_M
VDD_M
DRAM ECC
Driven by the MV78100 during write to SDRAM.
Driven by SDRAM during reads.
NOTE: When ECC is unused, leave M_CB[7:0] unconnected.
M_DQS[8:0],
M_DQSn[8:0]
t/s
I/O
SSTL
SSTL
SDRAM Data Strobe
Driven by the MV78100 during write to SDRAM.
Driven by SDRAM during reads.
NOTES:
•
•
When ECC is unused, leave M_DQS[8] unconnected.
When configured to 32-bit mode, M_DQS[7:4] and
M_DQSn[7:4] can be left unconnected.
M_DM[8:0]
O
VDD_M
SDRAM Data Mask
Asserted by the MV78100 to select the specific bytes out of the
72-bit data/ECC to be written to the SDRAM.
NOTES:
•
When ECC is unused, leave M_DM[8]/M_DQSn[8]
unconnected.
•
When configured to 32-bit mode, M_DM[7:4] can be left
unconnected.
M_ODT[3:0]
O
SSTL
VDD_M
SDRAM On Die Termination Control
Driven by the MV78100 device high to connect DRAM on die
termination, and low to disconnect the DRAM termination.
NOTES:
•
For the recommended setting, refer to the MV76100,
MV78100, and MV78200 Design Guide.
When unused can be left unconnected.
•
M_STARTBURST
O
I
SSTL
SSTL
VDD_M
VDD_M
MV78100 indication of starting a burst.
NOTE: For the exact length calculation for routing and
termination requirements, see the MV76100, MV78100,
and MV78200 Design Guide.
M_START
BURST_IN
M_STARTBURST signal routed back to MV78100. Used as a
reference signal for the incoming read data driven by the
SDRAM.
NOTE: For the exact length calculation for routing and
termination requirements, see the MV76100, MV78100,
and MV78200 Design Guide.
M_BB
I
I
CMOS
Calib
VDDO_C
SDRAM battery backup trigger
NOTE: This signal is multiplexed on the MPP pins, see Section 6,
Pin Multiplexing, on page 44.
M_PCAL
DRAM interface signals P channel output driver calibration.
Connect to VSS through a 35–70 Ω resistor.
NOTE: See the MV76100, MV78100, and MV78200 Design
Guide for the recommended values of the calibration
resistors.
MV-S104552-U0 Rev. D
Page 24
Copyright © 2008 Marvell
Document Classification: Proprietary Information
December 6, 2008, Preliminary
MARVELL [ MARVELL TECHNOLOGY GROUP LTD. ]
