CHAPTER 4 BUS CONTROL FUNCTION
User’s Manual U12688EJ4V0UM00
116
Table 4-1. Bus Cycles in Which the Wait Function Is Valid (2/2)
Programmable Wait Setting
Bus Cycle
Type of Wait
Higher Order: Register
Lower Order: Bit
Number
of Waits
Wait by
WAIT Pin
RWC
RAS pre-charge
RRW0, RRW1
0 to 3
×
RWC
RAS active width
RCW0 to RCW2
0 to 7
×
RWC
CBR self-refresh cycle
Self-refresh
release width
SRW0 to SRW2
0 to 14
×
DWC1, DWC2
TW
DWxx
0 to 7
{
FDW
External I/O
↔
SRAM
Data access
wait
TF
FDWm
0, 1
×
DRCn
RAS pre-charge
RPC0n, RPC1n
0 to 3
×
DRCn
Row address hold
RHC0n, RHC1n
0 to 3
×
DRCn
TW
DAC0n, DAC1n
0 to 3
{
FDW
Off-page
Data access
wait
TF
FDWm
0, 1
×
DRCn
CAS pre-charge
CPC0n, CPC1n
0 to 3
×
DRCn
TW
DAC0n, DAC1n
0 to 3
{
FDW
DRAM
→
External I/O
On-page
Data access
wait
TF
FDWm
0, 1
×
DRCn
RAS pre-charge
RPC0n, RPC1n
0 to 3
×
DRCn
Row address hold
RHC0n, RHC1n
0 to 3
{
DRCn
TW
DAC0n, DAC1n
0 to 3
×
FDW
Off-page
Data access
wait
TF
FDWm
0, 1
×
DRCn
CAS pre-charge
CPC0n, CPC1n
1 to 3
{
DRCn
TW
DAC0n, DAC1n
0 to 3
×
FDW
DMA flyby transfer
cycle
External I/O
→
DRAM
On-page
Data access
wait
TF
FDWm
0, 1
×
Remarks 1.
{
: Valid
×
: Invalid
2. n = 0 to 3
m = 0 to 7
xx = 00 to 02, 10 to 12, 20 to 22, 30 to 32, 40 to 42, 50 to 52, 60 to 62, 70 to 72
Содержание V850E/MS1 UPD703100
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