Data Sheet

16
FORM NO.: FR2-015_ A Responsible Department：WBU Expiry Date: Forever
The information contained herein is the exclusive property of AzureWave and shall not be distributed, reproduced, or disclosed
in whole or in part without prior written permission of AzureWave.
SDIO Timing Data(Default Mode)
Symbol
Parameter
Condition
Min
Max
Units
f
pp
CLK Frequency
Normal
0
25
MHz
High Speed
0
50
t
WH
CLK High Time
Normal
10
-
ns
High Speed
7
-
t
WL
CLK Low Time
Normal
10
-
High Speed
7
-
tTLH
CLK rise Time
Normal
-
10
High Speed
-
3
tTHL
CLK fall Time
Normal
-
10
High Speed
-
3
t
ISU
Input Setup Time
Normal
5
-
High Speed
6
-
t
IH
Input Hold Time
Normal
5
-
High Speed
2
-
t
ODLY
Output Delay Time
Normal
-
14
High Speed
-
14
3.4.2 UART Interface
The AW-CM390SM shares a single UART for Bluetooth. The UART is a standard 4-wire interface
(RX, TX, RTS, and CTS) with adjustable baud rates from 9600 bps to 4.0 Mbps. The interface
features an automatic baud rate detection capability that returns a baud rate selection. Alternatively,
the baud rate may be selected through a vendor-specific UART HCI command.
UART has a 1040-byte receive FIFO and a 1040-byte transmits FIFO to support EDR. Access to the
FIFOs is conducted through the AHB interface through either DMA or the CPU. The UART supports
the Bluetooth 4.0 UART HCI specification: H4, a custom Extended H4, and H5. The default baud
rate is 115.2 Kbaud. The UART supports the 3-wire H5 UART transport, as described in the Bluetooth
specification (“Three-wire UART Transport Layer”). Compared to H4, the H5 UART transport reduces
the number of signal lines required by eliminating the CTS and RTS signals. Normally, the UART
baud rate is set by a configuration record downloaded after device reset, or by automatic baud rate
detection, and the host does not need to adjust the baud rate. Support for changing the baud rate
during normal HCI UART operation is included through a vendor-specific command that allows the
host to adjust the contents of the baud rate registers. The AW-CM390SM UARTs operate correctly
with the host UART as long as the combined baud rate error of the two devices is within ±2%.