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Hello,
I would like clarification on certain comments made in this post:
#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.
Solved! Go to Solution.
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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.
Pranava
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Hi,
#1 -> Pull up/down resistors were just a suggestion. JTAG can operate without any external components.
#2 -> Your understanding is correct. You just can't use them concurrently.
#3 -> Revision M of the datasheet is accurate. May I know which revision had those 2 values swapped?
Best regards,
Pranava
Pranava
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Thank you for the quick reply.
For #2, I am deeply concerned about the statement found in revision M, page 6:
"Note: When JTAG is enabled, other interfaces in the CY7C65215/CY7C65215A device cannot be used."
This sounds like the other interfaces are permanently disabled, so I must really confirm which is true.
For #3, revision E, which is still referenced by many of your suppliers, has the TDI and TDO pins swapped.
Please reply at your earliest convenience.
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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.
Pranava