Neoway N720 - 2.8.2 WLAN Control

N720 Hardware User Guide
Copyright © Neoway Technology Co., Ltd 33
Figure 2-29 SDIO DDR timing
Command
Read
Command
Write
t(pdcwr)
t(csurd)
t(chrd)
SD_CLK
DATA
Read
DATA
Write
t(dsurd)
t(dhrd)
t(pddwr)
t(pddwr)
Table 2-5 Timing parameters of SDIO interface
Timing Parameter
Min.
Typical
Max.
Unit
SDR mode (max. 200 MHz)
t(cvdrd)
Command valid time
2.4
-
-
ns
t(dvdrd)
Data valid time
2.4
-
-
ns
t(pddwr)
Delay time from data write to transmit
-1.45
-
0.85
ns
t(pdcwr)
Delay time from command write to transmit
-1.45
-
0.85
ns
DDR mode (max. 50 MHz)
t(chrd)
Command hold time
1.5
-
-
ns
t(csurd)
Command set-up time
5.53
-
-
ns
t(dhrd)
Data hold time
1.5
-
-
ns
t(dsurd)
Data set-up time
1.65
-
-
ns
t(pddwr)
Delay time from data write to transmit
2.5
-
6.15
ns
t(pdcwr)
Delay time from command write to transmit
-7.85
-
2.65
ns
2.8.2 WLAN Control
Signal
Pin No.
I/O
Function
Remarks
LTE_COEX_RX_UART
48
DI
WLAN/LTE co-exist
control receive
Multiplexing function of
FORCE_USB_BOOT
Leave this pin unconnected if it
is not used.
LTE_COEX_TX_UART
50
DO
WLAN/LTE co-exist
control transmit
Leave this pin unconnected if it
is not used.