HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 283

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

A4WM
A3WM
A2WM
A1WM
A0WM
0
1
Bits 7 to 4—Reserved bits: These bits are always read as 0. The write value should always be 0.
Bits 3 and 2—Idles between Cycles for Area 4 (IW41, IW40): These bits specify idle cycles
inserted between cycles in CS4 in the same way as for CS 0 to 3. The set values below show the
minimum number of idle cycles; more cycles than indicated by the Idles between Cycles setting
may actually be inserted.
Bit 3: IW41
0
1
Bits 1 and 0—Wait Control for Area 4 (W41, W40): These bits specify waits for CS4 in the same
way as for areas 0 to 3.
Bit 1: W41
0
1
266
W41
W31
W21
W11
W01
0
1
Don’t care
Bit 2: IW40
0
1
0
1
Bit 0: W40
0
1
0
1
W40
W30
W20
W10
W00
0
1
0
1
Don’t care
Description
External wait input ignored
External wait input enabled
External wait input enabled
External wait input enabled
External wait input ignored
Description
No idle cycle
One idle cycle inserted
Two idle cycles inserted
Four idle cycles inserted
Description
External wait input disabled without wait
External wait input enabled with one wait
External wait input enabled with two waits
Complies with the long wait specification of bus control
registers 1 and 3 (BCR1, BCR3). External wait input is
enabled
(Initial value)
(Initial value)
(Initial value)