Interfacing an External SPI Device with the CYUSBS234/236 DVK – KBA92331
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Question: How can you connect an external SPI device to the CYUSBS234/236 DVK?
Answer:
TheCYUSBS234 DVK has one Serial Communication Block (SCB) that can be configured as SPI, while the CYUSBS236 DVK has two SCBs (SCB0 and SCB1) that can be configured as SPI. By default, the SPI lines of the SCBs on both the DVKs are connected to the on-board SPI EEPROM(s) through jumpers (J17, J19, J20, and J21 for CYUSBS234; J17, J19, J20, J21, J24, J25, J26, and J27 for CYUSBS236). Table 1 provides details on the location of the SPI pins available on both of the DVKs and how to connect them for interfacing external SPI devices.
Table 1. SPI Pin Mapping
CYUSBS234 | CYUSBS236 | |||||
SCB | SCB0 | SCB1 | ||||
On Board SPI EEPROM | External SPI device | On Board SPI EEPROM | External SPI device | On Board SPI EEPROM | External SPI device | |
SSEL | Short Pin No:2 and 3 of J19 | Remove the Jumper present on J19. Connect the SSEL line of the external SPI device to Pin No: 2 of J19 | Short Pin No:2 and 3 of J19 | Remove the Jumper present on J19. Connect the SSEL line of the external SPI device to Pin No: 2 of J19 | Short Pin No:2 and 3 of J26 | Remove the Jumper present on J26. Connect the SSEL line of the external SPI device to Pin No: 2 of J26 |
SCLK | Short Pin No:2 and 3 of J21 | Remove the Jumper present on J21. Connect the SCLK line of the external SPI device to Pin No: 2 of J21 | Short Pin No:2 and 3 of J21 | Remove the Jumper present on J21. Connect the SCLK line of the external SPI device to Pin No: 2 of J21 | Short Pin No:2 and 3 of J27 | Remove the Jumper present on J27. Connect the SCLK line of the external SPI device to Pin No: 2 of J27 |
MISO | Short Pin No:2 and 5 of J17 | Remove the Jumper present on J17. Connect the MISO line of the external SPI device to Pin No: 2 of J17 | Short Pin No:2 and 5 of J17 | Remove the Jumper present on J17. Connect the MISO line of the external SPI device to Pin No: 2 of J17 | Short Pin No:2 and 5 of J24 | Remove the Jumper present on J24. Connect the MISO line of the external SPI device to Pin No: 2 of J24 |
MOSI | Short Pin No:2 and 5 of J20 | Remove the Jumper present on J20. Connect the MOSI line of the external SPI device to Pin No: 2 of J20 | Short Pin No:2 and 5 of J20 | Remove the Jumper present on J20. Connect the MOSI line of the external SPI device to Pin No: 2 of J20 | Short Pin No:2 and 5 of J25 | Remove the Jumper present on J25. Connect the MOSI line of the external SPI device to Pin No: 2 of J25 |
You can connect the SSEL, SCLK, MISO, and MOSI lines of the external device to the pin numbers given in Table 1. Refer to the CYUSBS234/236 DVK schematics for more details about the jumpers:
CYUSBS234 USB TO SERIAL DVK BOARD
CYUSBS236 USB TO SERIAL DVK BOARD
Figure 1. SPI Connection of CY7C65211
Figure 2. SPI connection of CY7C65215
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