Texas Instruments CC2520, User Manual

Page: 25 / 45

swru138
25/33
7.12 Break-out headers and jumpers (P1 and P4)
USB Controller
(CC2511)
P4 Jumpe
rs
User Interface EM Interface
P1 Jumpers
Figure 19 - Basic signal flow on the evaluation board
The signals from the EM connectors are connected to user interfaces or the CC2511 on the
EB, but all of the signals are gated through either header P1 or P4. Jumpers on these
headers allows for fine tuned control of which signals are routed to what device and allows
easy break-out of signals for debugging and development using proprietary peripherals.
All of the peripherals on the board and the USB controller can be isolated entirely from the
EM, facilitating accurate power consumption measurements.
Pins Function Description Default mounted
1-2 UART_RTS
Ready to send – for systems supporting hardware flow
control
No
3-4 UART_CTS Clear to send – for systems supporting hardware flow control No
5-6 UART_RX Received data- connected to TX on CC2511 Yes
7-8 UART_TX Transmitted data – connected to RX on CC2511 Yes
9-10 SNIFF_DATA Sniff interface – bit stream of data from radio No
11-12 SNIFF_CLK Sniff interface – clock for data sampling No
13-14 SNIFF_MISO Sniff interface – not used No
15-16 SNIFF_SFD Sniff interface – start of frame delimiter from No
17-18 DBG_DC Debug Clock signal (debug interface for system-on-chips) Yes
19-20 DBG_DD Debug Data signal (debug interface for system-on-chips) Yes
21-22 CS Chip select for SPI device on EM module Yes
23-24 SCLK SPI clock Yes
25-26 MOSI SPI data – master output, slave input Yes
27-28 MISO SPI data – master input, slave output Yes
29-30 LCD_CS Chip select for LCD Yes
31-32 LCD_MODE LCD control signal Yes
33-34 LCD_FLASH_RESET Common reset signal for serial Flash and LCD Yes
35-36 JOY_LEVEL Voltage level from joystick, indicating position Yes
37-38 JOY_MOVE
There is a positive edge on this signal when the joystick is
moved
Yes
Table 5 - Jumpers on P1. Control signals available to the USB controller.