UPD30121 NEC [NEC], UPD30121 Datasheet - Page 43

• Manufacturer Part Number: UPD30121
• Description: VR4121TM 64-/32-BIT MICROPROCESSOR
• Manufacturer: NEC [NEC]

Read/write cycle time
MRAS (0:3)# pulse width
MRAS (0:3)# precharge time
UCAS#/LCAS# setup time (to MRAS (0:3)# )
UCAS#/LCAS# hold time (from MRAS (0:3)# )
MRAS (0:3)# precharge time from
UCAS#/LCAS#
UCAS#/LCAS# precharge time
UCAS#/LCAS#
(7) DRAM refresh parameter
Notes 1. In 32-bit mode: Applied to MRAS (0:1)# pins
MRAS (0:3)#
The target DRAM is the
42S65165G5-A50, or 42S65165G5-A60.
(a) CAS-before-RAS refresh parameter
2. In 32-bit mode: Applied to UUCAS#/MRAS3#, ULCAS#MRAS2#, UCAS#, and LCAS# pins
(output)
(output)
(output)
In 16-bit mode: Applied to UUCAS#/MRAS3#, ULCAS#/MRAS2#, and MRAS (0:1)# pins
In 16-bit mode: Applied to UCAS# and LCAS# pins
WR#
Note 1
Note 2
Parameter
H
t
CSR
PD42S161615L-A60, 42S18165L-A60, 42S64165G5-A50, 42S64165G5-A60,
Symbol
Data Sheet U14691EJ1V0DS00
t
t
t
t
t
t
RAS
t
CSR
CHR
CRP
CPN
RC
RP
t
t
CHR
RAS
t
RC
Condition
t
t
t
CRP
CPN
RP
MIN.
104
60
30
10
10
5
5
MAX.
PD30121
Unit
ns
ns
ns
ns
ns
ns
ns
43