R-IN32M3 Datasheet, PDF (77/116 Pages) Renesas Technology Corp – LSI for Industrial Ethernet

R-IN32M3 Series Data Sheet
4. Electrical Specifications
4.8.3
External Memory Interface Pins
(1) Calculating value for delay due to an external load
The values for transition delay of the external memory interface pins of the R-IN32M3 products do not consider external
load on them because it depends on the user environment. Calculate the value for delay in consideration with the load
under your environment and also with wiring delays on the printed board.
Drive capability
6 mA
12 mA
MIN.
0.026
0.012
Delay value per pF (ns)
MAX.
0.067
0.034
Example)
When an address pin (6- mA output buffer) has 30-pF load, the actual delay is as follows.
MIN.: 1.0 ns (The MIN delay value at the time of 0 pF) + (0.026×30) ns = 1.78ns
MAX.: 7.0 ns (The MAX delay value at the time of 0 pF) + (0.067×30) ns = 9.01ns
(2) Asynchronous SRAM MEMC access timing
Parameter
Address, CSZ0-CSZ3 output delay time (from BUSCLK↑)
RDZ output delay time (from BUSCLK↑)
WRZ0 - WRZ3 (BENZ0-BENZ3), WRSTBZ output delay time
(from BUSCLK↑)
BCYSTZ output delay time (from BUSCLK↑)
WAITZ input setup time (to BUSCLK↓)
WAITZ input hold time (to BUSCLK↓)
Date input setup time (from BUSCLK↑)
Data input hold time (from BUSCLK↑)
Date output delay time (from BUSCLK↑)
Data float delay time (from BUSCLK↑)
Symbol
tDKA
tDKRD
tDKWR
tDKBSL
tSKW
tHKW
tSKID
tHKID
tDKOD
tHKOD
MIN
1.0
(1.78) ^Note
1.0
(1.78) ^Note
1.0
(1.78) ^Note
1.0
(1.78) ^Note
4.0
0
4.0
0
1.0
(1.78) ^Note
1.0
(1.78) ^Note
Note: Values in parenthesis are based on a 30pF capacitive load.
MAX
Unit
7.0
(9.01) ^Note
ns
7.0
(9.01) ^Note
ns
7.0
(9.01) ^Note
ns
7.0
(9.01) ^Note
ns
-
ns
-
ns
-
ns
-
ns
7.0
(9.01) ^Note
ns
7.0
(9.01) ^Note
ns
R18DS0008EJ0401
Feb 28, 2017
Page 77 of 110