r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 489

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Figure 12.1 shows a block diagram of the DBSC2.
DBSC2
Notes:
Request queue:
Write data queue:
Response queue:
Control unit:
Registers:
DDRPAD:
Request
queue
Control
unit
MCK0/
MCK0,
MCK1/
MCK1
Stores the access request of the SuperHyway bus.
Stores the write data sent from the SuperHyway bus.
Stores the read data to be sent back to the SuperHyway bus.
Controls each block depending on the request sent from the request queue.
Store timing parameters and SDRAM configuration information.
Interfaces with the DDR2-SDRAM. This incorporates the DLL
to perform phase adjustment of the DQS.
Figure 12.1 Block Diagram of the DBSC2
MCKE, MA14 to MA0,
MBA2 to MBA0, MCS,
MRAS, MCAS, MWE,
MODT
Registers
Write data
queue
SuperHyway Bus
DDR2-SDRAM
IO cells
BUS IF
DDRPAD
DLL
MDQS3 to MDQS0,
MDQS3 to MDQS0,
MDM3 to MDM0,
MDQ31 to MDQ0
Response
queue
Rev.1.00 Jan. 10, 2008 Page 459 of 1658
12. DDR2-SDRAM Interface (DBSC2)
MBKPRST, MVREF
REJ09B0261-0100