SH7750_08 Datasheet, PDF (479/1162 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 13 Bus State Controller (BSC)
• When DRAM or Synchronous DRAM Interface is Set*¹
Bit 15: A3W2 Bit 14: A3W1 Bit 13: A3W0
0
0
0
1
1
0
1
1
0
0
1
1
0
1
Notes: 1. External wait input is always ignored.
2. Inhibited in RAS down mode.
Description
DRAM CAS
Assertion Width
Synchronous DRAM
CAS Latency Cycles
1
Inhibited
2
1^*2
3
2
4
3
7
4^*2
10
5^*2
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 DRAM or synchronous DRAM is used. For details on MPX
interface setting, see table 13.6, MPX Interface is Selected (Areas 0 to 6).
• 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.7.00 Oct. 10, 2008 Page 395 of 1074
REJ09B0366-0700