3.12 Serial Flash (U301)

The PIC32 WFI32 Curiosity HPC Board has an on-board 32-Mb external Serial Flash (SST26VF032B) (U301) memory for storage of data. This Serial Flash (U301) can be interfaced with the WFI32E02 Module either over the SPI or SQI by selecting the available resistor jumper options. The following tables provide the details of the Serial Flash pin connection over SPI1 and SQI.
Table 3-17. Serial Flash Interface Over SPI Pin Description – U301
Pin NumberPin on SPI Serial Flash (SST26VF032B) Pin Description of Serial FlashPin on the WFI32E02 Module(1)
U301-1CEChip EnableSPI1CS/RPA1/RA1
U301-2SOSerial Data Output for SPI modeSDI1/RPC7/RC7
U301-3WPWrite-ProtectNC
U301-4VSSGroundGND
U301-5SISerial Data Input for SPI modeSDO1/RPC8/RC8
U301-6SCKSerial clockSCK1/RPC6/RC6
U301-7HOLDHoldNC
U301-8VDDInput power supplyNC
Note:
  1. For more details on the WFI32E02 pins, refer to the PIC32MZ W1 MCU and WFI32 Module with Wi-Fi and Hardware-Based Security Accelerator Data Sheet (DS70005425).
Table 3-18. Serial Flash Interface Over SQI Pin Description – U301
Pin NumberPin on Serial Flash (SST26VF032B)Pin Description of Serial FlashPin on the WFI32E02 Module(1)
U301-1CEChip Enable

SQICS0/RPA0 or SQICS1/RPC0/RC0(2)

U301-2SIO1Serial Data Output for SPI modeSQID1/RPC3/RC3
U301-3SIO2Write-ProtectSQID2/RPC2/RC2
U301-4VSSGroundGND
U301-5SIO0Serial Data Input for SPI modeSQID0/RPC4/RC4
U301-6SCKSerial clockSQICLK/RPC5/RC5
U301-7

SIO3

HoldSQID3/RPC1/RC1
U301-8VDDInput power supplyNC
Note:
  1. For more details on the WFI32E02 pins, refer to the PIC32MZ W1 MCU and WFI32 Module with Wi-Fi and Hardware-Based Security Accelerator Data Sheet (DS70005425).
  2. Mount the jumper (J301) between pins 1-2 to use SQICS0 or between pin 2 and pin 3 to use SQICS1.

The following table provides the details about the resistor mounting instructions for the selection of either the SPI or SQI.

Table 3-19. Resistor Mounting Instruction for Selection of Either SPI or SQI
Mounting Instructions
SPI (Default)SQI
MountRemoveMountRemove
R313, R318R320, R324R320, R324R313, R318
R323, R325R326. R319, R321R326, R319, R321 R323, R325