Cypress CYW943907AEVAL1F, User Manual

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CYW943907AEVAL1F Evaluation Kit User Guide, Doc. No. 002-18703 Rev. *B 28
4.
Hardware
This chapter describes the CYW943907AEVAL1F EVK hardware and its different blocks, such as Bootstrap, reset control,
Arduino-compatible headers, and module connectors. The schematic is available as part of the
CYW943907AEVAL1F
Hardware Files.zip file at http://www.cypress.com/documentation/development-kitsboards/cyw943907aeval1f-evaluation-kit .
Bootstrap options available in the CYW943907AEVAL1F EVK are shown in Table 4-1 . Pins are sampled at power-on reset
(POR) to determine various operating modes. Sampling occurs a few milliseconds after an internal POR or deassertion of the
external POR. After the POR, each pin assumes the GPIO or alternative function specified in the CYW43907 Alternate GPIO
function table in the
CYW43907 datasheet .
Ensure the gSPI mode and SDIO Host are not turned ON at the same time because they share the same set of lines. For
more information regarding bootstrap options, refer to the
CYW43907 Datasheet .
Bootstrap options other than GPIO_7 and GPIO_13, are not available for the user to modify in this board.
To change Bootstrap options for GPIO_7 and GPIO_13, refer to
the “Bootstraps, Flash” page of schematics.
Table 4-1. Bootstrap Options Available in CYW943907AEVAL1F EVK
Pin Strap Function
Strap Pull
Chip Default Board Default
GPIO_1
gSPI Mode
0 = Enable gSPI Mode
1 = Disable gSPI Mode
0 0
GPIO_7
WCPU Boot Mode:
0 = TCROM Boot
1 = TCMSRAM Boot
0
1
R135=10k to WLAN_VDDIO
GPIO_11
ACPU Boot Mode:
0 = SOCROM Boot
1 = SOCSRAM Boot
0 0
GPIO_13
SDIO Mode:
0 = SDIO Device
1 = SDIO Host
0
1
R141=10k to WLAN_VDDIO
GPIO_15
PMU VTRIM_enable
0 = VTRIM disable
1 = PMU VTRIM enabled
Note: GPIO_15 is not a strap option for the B0
silicon revision of the device.
0 0
RF_SW_CTRL_5
Host DAP Clock Sel
1 = Enable XTAL clock for DAP subsystem
0 = Disable Use Test clock TCK for DAP
subsystem
0 0
RF_SW_CTRL_7
PMU resource initialization mode selection
1 = Mode 1
0 = Mode 2
0 0
RF_SW_CTRL_9
LPO (Low Power oscillator) Selection:
0 = LPO from HIB (Hibernation Block)
1 = Internal 32 kHz LPO
0 0