r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 571

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

Figure 12.18 is an example of a case in which, after issuing a READ command, a WRITE
command is issued. In order to issue the WRITE command after issuing the READ command, the
DBSC2 waits for a minimum time stipulated by the RDWR bits.
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]
Example of CL = 3
SDRAM
command
READ
bank
any
Valid
Valid
Valid
Invalid
Invalid
RDWR
= 4 cycles
Figure 12.18 READ-WRITE Minimum Time
Invalid
Invalid
Invalid
High level
WRITE
Read data
bank
any
Valid
Valid
Valid
Invalid
Write data
Rev.1.00 Jan. 10, 2008 Page 541 of 1658
12. DDR2-SDRAM Interface (DBSC2)
Invalid
Invalid
Invalid
Invalid
Invalid
REJ09B0261-0100