HD6417751RBP240V Datasheet, PDF (470/1226 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

13. Bus State Controller (BSC)
• When DRAM or Synchronous DRAM Interface is Set*
Note: * External wait input is always ignored
Bit 15: A3W2 Bit 14: A3W1 Bit 13: A3W0
0
0
0
1
1
0
1
1
0
0
1
1
0
1
Note: * Inhibited in RAS down mode
Description
DRAM CAS
Assertion Width
Synchronous DRAM
CAS Latency Cycles
1
Inhibited
2
1*
3
2
4
3
7
4*
10
5*
13
Inhibited
16
Inhibited
Bits 11 to 9—Area 2 Wait Control (A2W2–A2W0): These bits specify the number of wait states
to be inserted for area 2. External wait input is only enabled when the SRAM interface or MPX
interface is used, and is ignored when synchronous DRAM is used. For the case where an MPX
interface setting is made, see table 13.7.
• When SRAM Interface is Set
Bit 11: A2W2
0
1
Bit 10: A2W1
0
1
0
1
Bit 9: A2W0
0
1
0
1
0
1
0
1
Description
Inserted Wait States
RDY Pin
0
Ignored
1
Enabled
2
Enabled
3
Enabled
6
Enabled
9
Enabled
12
Enabled
15 (Initial value)
Enabled
Rev.4.00 Oct. 10, 2008 Page 370 of 1122
REJ09B0370-0400