CY7C65215 JTAG interface pin specifications

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HansonQuan
Level 1
Level 1
First reply posted First question asked Welcome!

Hello,

I would like clarification on certain comments made in this post:

https://community.cypress.com/t5/USB-Low-Full-High-Speed/cy7c65215-jtag-pin-types-and-connections/m-...

#1: Are pullups/pulldowns REQUIRED on the JTAG pins, or just SUGGESTED? If required, please confirm which pins get pullups/pulldowns.

#2: @YatheeshD_36 makes the comment: "Once SCB 1 is configured as JTAG the other interface in CY7C65215 cannot be used." This is NOT my understanding. I thought the restriction was that SCB 0 and SCB 1 could not be used concurrently. Please clarify, as this will severely affect my design.

#3: (unrelated to the referenced post): In the datasheet, revision M (https://www.cypress.com/file/129956/download) table 17 shows that SCB1 Mode 7 (JTAG) has TDO as pin 5, and TDI as pin 6. In prior versions, these two were swapped. Please also confirm that revision M is correct.

Thank you.

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Pranava_YN
Moderator
Moderator
Moderator
100 likes received 500 replies posted 250 solutions authored

Hi,

Sorry for the delayed response.

for #2, You can refer to [4] in Errata section which explicitly states "JTAG cannot be simultaneously used along with I2C/SPI/UART on SCB0. There will not be any functional impact while using JTAG and I2C/SPI/UART on SCB0 if both are not operated simultaneously."

For #3, latest revision  ( rev M)present in the Cypress website is accurate and can be followed.

Best regards,
Pranava

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