Data Sheet

F89ESSM23
FN-LINK TECHNOLOGY LIMITED
11
HS
6
-
ns
T
IH
Input Hold Time
DEF
5
-
ns
HS
2
-
ns
T
ODLY
Output Delay Time
DEF
-
14
ns
HS
-
14
ns
7.3.2 SDIO/GSPI Interface Signal Level
The SDIO and GSPI signal level ranges from 1.8V to 3.3V.
The DC characteristics of a typical signal level, 3.3V/2.8V/1.8V are shown in section 6.3.2 Digital IO Pin
DC Characteristics, page 9.
7.3.3 SDIO Interface Power-On Sequence
After power-on, the SDIO interface is selected by the RTL8189ES-VB automatically when a valid SDIO
command is received. To attain better SDIO host compatibility, the following power-on sequence is
recommended:
Definitions
T33ramp’: The 3.3V power pre-charge ramp up duration before formal power up. We recommend that a 3.3V
power-on and then power-off sequence is executed by the host controller before the formal power-on
sequence. This procedure can eliminate the host card detection issue when the power ramp up
duration is too long or the system warm reboot fails.
Toff : The duration 3.3V is cut off before formal power up.
T33ramp: The 3.3V main power ramp up duration.
T12ramp: The internal 1.2V ramp up duration.
TPOR: The duration the power-on reset releases, and the power management unit executes power-on tasks.
The power-on reset will detect both 3.3V and 1.2V power ramp up after a predetermined duration.