User's Manual

CY920
DS60001270C-page 10 Preliminary © 2014 Microchip Technology Inc.
1.2 Pin Description
Table 1-5 through Tabl e 1-15 provide an overview of
the important control and interface signals. It also
covers pinouts and signal names.
TABLE 1-5: POWER
TABLE 1-6: SERIAL PERIPHERAL INTERFACE (SPI)
TABLE 1-7: SPI FLASH INTERFACE
Signal Type Description
3.3V P Power input +3.3V
1.2V P Power input +1.2V
1.8V P Power input +1.8V
2.5V P Power input +2.5V
3.3V RTC P Power input +3.3V for Real-Time Clock (RTC). Power can be provided by battery or
external Supercap.
GND P Ground (GND) connection for power supply, signal returns and shielding
Legend: O = Output I /O = Input /Output I = Input P = Power
Signal Type Description
SPI_DOUT O SPI data from DM920 to Host controller
SPI_DIN I SPI data from Host controller to DM920
SPI_CLK I SPI clock from Host controller to DM920 (maximum recommended
frequency is 2 MHz and typical frequency is 1 MHz, see Note 1)
SPI_NCS0 I SPI Chip Select from Host controller to DM920
MII_RXD2 O • This GPIO signal is used as SPI_REQ (SPI request signal) from DM920 to
Host controller for eDMP applications.
• Logic 1 indicates there is an SPI message waiting to be read. The Host
controller should start the SPI clock and read any changed registers.
• Logic 0 indicates that all changed register messages have been read and the
message buffer is empty.
Legend: O = Output I /O = Input /Output I = Input P = Power
Note 1: For SPI timing diagram for eDMP applications, refer to “MCHP-JB -
Device_Control_Protocol_Registers_v_6_5” or later version. For detailed setup and hold timing details,
refer to the “DM920 Data Sheet” (DS60001278).
Signal Type Description
SPI1CS0 O Chip Select input for on-board Flash
AV3CTRL1 (GPIO6) O Chip Select for external Flash. For more information on how to connect
and access external Flash, refer to the Chapter 18. External Flash
Interface chapter in the “JukeBlox
®
Technology 4.X SDK User's Guide”
(DS70005181).
SPI1CLK O Clock signal to drive serial Flash
SPI1DIN I Data line from Flash output to DM920 input
SPI1DOUT O Data line from DM920 output to Flash input
SPI1HOLDB O Serial Flash control input
SPI1WPROT O Write protect input to serial Flash
Legend: O = Output I /O = Input /Output I = Input P = Power