User's Manual

T
T
T
S
S
S
3
3
3
2
2
2
M
M
M
~
~
~
1
1
1
G
G
G
C
C
C
F
F
F
8
8
8
0
0
0
80X CompactFlash Card
Transcend Information Inc.
22
3.8 Common Memory Write Timing Specification
Cycle Time Mode: 250 ns 120 ns 100 ns 80 ns
Item Symbol
IEEE
Symbol
Min
ns.
Max
ns.
Min
ns.
Max
ns.
Min
ns.
Max
ns.
Min
ns.
Ma
x
ns.
Data Setup before WE tsu (D-WEH) tDVWH 80 50 40 30
Data Hold following WE th(D) tWMDX 30 15 10 10
WE Pulse Width tw(WE) tWLWH 150 70 60 55
Address Setup Time tsu(A) tAVWL 30 15 10 10
CE Setup before WE tsu(CE) tELWL 0 0 0 0
Write Recovery Time trec(WE) tWMAX 30 15 15 15
Address Hold Time th(A) tGHAX 20 15 15 15
CE Hold following WE th(CE) tGHEH 20 15 15 10
Wait Delay Falling from WE tv (WT-WE) tWLWTV 35 35 35 na
1
WE High from Wait Release tv(WT) tWTHWH 0 0 0 na
1
Wait Width Time 2 tw (WT) tWTLWTH 350 350 350 na
1
Notes: 1) –WAIT is not supported in this mode.
2) The maximum load on -WAIT is 1 LSTTL with 50 pF (40pF below 120nsec Cycle Time) total load. All times are in
nanoseconds. Din signifies data provided by the system to the CompactFlash Storage Card. The -WAIT signal may be
ignored if the -WE cycle to cycle time is greater than the Wait Width time. The Max Wait Width time can be determined from
the Card Information Structure. The Wait Width time meets the PCMCIA PC Card specification of 12µs but is intentionally
less in this specification.