Ricoh R5C841 - Manual (Page 64)

R5C841 PCI-CardBus/IEEE 1394/SD Card/Memory Stick/xD/ExpressCard Data Sheet
12345  2004 R EV . 1.10 5-11
Memory Write
(VCC_ROUT= 1.65~1.95V, VCC_3V=3.0~3.6V, Ta=0~70ºC)
Symbol Parameter Min Max Unit Note
CADR [25:0], REG#, CE [2:1]#
t7a Setup Time, CADR [25:0], REG# and CE
[2:1]# before WE# Low Tsu-20 ns 1,2
Tsu=1~7Tcyc
Programmable
t7c Hold Time, CADR [25:0], REG# and CE
[2:1]# after WE# High Thl-10 ns 1,2
Thl=1~7Tcyc
Programmable
WE#
t7b Pulse Duration, WE# Low Tpw-20 ns 1,2
Tpw=3~31Tcyc
Programmable
CDATA [15:0]
t7d Setup Time, CDATA [15:0] before WE#
Low Tsu-20 ns 1,2
Tsu=1~7Tcyc
Programmable
t7e Hold Time, CDATA [15:0] after WE# High Thl-10 ns 1,2
Thl=1~7Tcyc
Programmable
WAIT#
t7f Hold Time, WE# Low after WAIT# High Tcyc+0 ns 1
t7g Valid Delay, WE# Low to WAIT# Low 50 ns
Note1: Tcyc is PCICLK cycle time. (Typically 30ns)
Note2: Tsu, Tpw, Thl can be programmed by setting 16-bit Memory Timing 0 register.
16-bit Card Memory Write Timing
WAIT#
CDATA
WE#
CADR,REG#,
CE1#,CE2#
t7g t7f
Data
t7d
t7a
t7b
PCICLK
t7e
t7c
16-bit Card Memory Write Timing