Data Sheet

K255B-SR
FN-LINK TECHNOLOGY LIMITED Proprietary & Confidential Information
17
6.5 SDIO Bus Timing Specifications in SDR Modes
Clock timing(SDR Modes)
Parametwer
Symbol
Minimum
Maximum
Unit
Comments
-
t
CLK
40
-
ns
SDR12 mode
20
-
ns
SDR25 mode
10
-
ns
SDR50 mode
4.8
-
ns
SDR104 mode
-
t
CR
, t
CF
-
0.2 × t
CLK
ns
t
CR
, t
CF
< 2.00 ns (max)@100 MHz,
C
CARD
= 10 pF
t
CR
, t
CF
< 0.96 ns (max)@208 MHz,
C
CARD
= 10 pF
Clock duty
-
30
70
%
-
Card Input timing (SDR Modes)
Symbol
Minimum
Maximum
Unit
Comments
SDR104 Mode
t
IS
1.70
a
-
ns
C
CARD
= 10pF, VCT = 0.975V
t
IH
0.80
-
ns
C
CARD
= 5pF, VCT = 0.975V
SDR50 Mode
t
IS
3.00
-
ns
C
CARD
= 10pF, VCT = 0.975V
t
IH
0.80
-
ns
C
CARD
= 5pF, VCT = 0.975V
a. SDIO 3.0 specification value is 1.40 ns.