User Manual

EMMY-W1 series - User Manual
UBX-16015271 - R03 Product Information Interfaces
Page 14 of 46
Symbol
Parameter
Condition
Min.
Typ
Max.
Units
Clock
T
CLK
Clock time
50 MHz (max) between rising edges
DDR50
20
ns
T
CR,
T
CF,
Rise time, fall time
T
CR
, T
CF
< 4.00 ns (max) at 50 MHz
C
CARD
= 10 pF
DDR50
0.2*T
CLK
ns
Clock Duty
DDR50
45
55
%
CMD Input (referenced to clock rising edge)
T
IS
Input setup time
C
CARD
≤ 10 pF (1 card)
DDR50
6
ns
T
IH
Input hold time
C
CARD
≤ 10 pF (1 card)
DDR50
0.8
ns
CMD Output (referenced to clock rising edge)
T
ODLY
Output delay time during data transfer mode
C
L
≤ 30 pF (1 card)
DDR50
13.7
ns
T
OHLD
Output hold time
C
L
≥ 15 pF (1 card)
DDR50
1.5
ns
DAT[3:0] Input (referenced to clock rising and falling edges)
T
IS2x
Input setup time
C
CARD
≤ 10 pF (1 card)
DDR50
3
ns
T
IH2x
Input hold time
C
CARD
≤ 10 pF (1 card)
DDR50
0.8
ns
DAT[3:0] Output (referenced to clock rising and falling edges)
T
ODLY2x (max)
Output delay time during data transfer mode
C
L
≤ 25 pF (1 card)
DDR50
7.0
ns
T
ODLY2x (min)
Output hold time
C
L
≥ 15 pF (1 card)
DDR50
1.5
ns
Table 7: SDIO timing data – DDR50 mode (50 MHz)
2.3 High Speed UART interface
The EMMY-W1 series modules support a high speed Universal Asynchronous Receiver/Transmitter (UART)
interface in compliance with the industry standard 16550 specification. The main features of the UART interface
are:
 FIFO mode permanently selected for transmit and receive operations
 2 pins for transmit and receive operations
 2 flow control pins
 Interrupt triggers for low-power, high throughput operation
 High throughput (4 Mbps)
The UART interface operation includes:
 Uploading the firmware to the module
 Supporting data input/output operation for peripheral devices connected through a standard UART
interface
Baud Rate
1200
38400
460800
1500000
3000000
2400
57600
500000
1843200
3250000
4800
76800
921600
2000000
3692300
9600
115200
1000000
2100000
4000000
19200
230400
1382400
2764800
Table 8: Supported UART Baud rates