r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 572

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

12. DDR2-SDRAM Interface (DBSC2)
Figure 12.19 is an example of a case in which, after issuing a WRITE command, a READ
command is issued. In order to issue the READ command after issuing the WRITE command, the
DBSC2 waits for a minimum time stipulated by the WRRD bits.
Rev.1.00 Jan. 10, 2008 Page 542 of 1658
REJ09B0261-0100
MCK0,
MCK1
MCKE
MCS
MRAS
MCAS
MWE
MA[14:11]
MA[9:0]
MA[10]
MBA[2:0]
MDQS[3:0]
MDM[3:0]
MDQ[31:0]
SDRAM
command
Example of CL= 3
WRITE
bank
any
Valid
Valid
Valid
Invalid
Invalid
Figure 12.19 WRITE-READ Minimum Time
WRRD
= 7 cycles
High level
Write data
Invalid
Invalid
Invalid
READ
bank
any
Valid
Valid
Valid
Invalid
Invalid
Invalid
Invalid
Read data
Invalid