HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 465

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

Table 19.6 Bus Timing (1) (cont)
Conditions: V
*: Normal products. Ta = –40 to +85°C for wide-temperature range products.
Item
AH delay time 1
AH delay time 2
Multiplexed address delay
time
Multiplexed address hold time
DACK0, DACK1 delay time 1
DACK0, DACK1 delay time 2
DACK0, DACK1 delay time 3
DACK0, DACK1 delay time 4
DACK0, DACK1 delay time 5
Read delay time
Data setup time for CAS
CAS setup time for RAS
Row address hold time
Write command hold time
Write command
setup time
Access time from CAS
precharge
Notes: 1. HBS and LBS signals are 25 ns.
2. When frequency is 10 MHz or more.
3. n is the number of wait cycles.
4. Access time from addresses A0 to A21 is tcyc-25.
5. –5 ns for parity output of DRAM long-pitch access.
6. It is not necessary to meet the t
*6
specification is met.
CC
= 5.0 V ±10%, V
35% duty
50% duty
35% duty
50% duty
*2
*2
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
AHD1
AHD2
MAD
MAH
DACD1
DACD2
DACD3
DACD4
DACD5
RDD
DS
CSR
RAH
WCH
WCS
ACP
SS
= 0 V, = 20 MHz, Ta = –20 to +75°C*
RDS
Min
—
—
—
0
—
—
—
—
—
—
—
0
10
10
15
0
0
t
cyc
*5
20
specification as long as the access time
Max
20
20
30
—
23
23
20
20
20
t
t
—
—
—
—
—
—
—
cyc
cyc
0.35 + 12
0.5 + 15
Unit Figures
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
19.19
19.8, 19.9, 19.11–
19.14, 19.19, 19.20
19.9, 19.13, 19.14,
19.19
19.11, 19.12
19.8, 19.9, 19.11-
19.15, 19.19, 19.24-
19.28
19.11, 19.13
19.16, 19.17, 19.18
19.11, 19.13
19.11
19.12
HITACHI 457