OMAP-L138: UPP WAIT and FIFO questions

Francis Judson

Part Number: OMAP-L138

The wait signal is indicated as required in table 33-5 (Section 33.2.5) of SPRUH77C.

* If this flow control is not needed, can this pin be omitted during PINMUX configuration?

As I understand it each channel has a 512 byte FIFO. If a channel operated in 8/16 bit mode, I assume this FIFO can hold up to 512/256 samples respectively.

* Is this correct?

Our application uses A & B channel in 8/16 bit RX mode. An FPGA supplies an enable signal to control data reception.

over 6 years ago

0 Yordan Kovachev over 6 years ago

TI__Guru**** 161600 points

Hi,

Please elaborate on your question:
1. Which interface are you referring to?

2. What are the pin names/numbers you want to configure??

Best Regards,
Yordan

0 Francis Judson over 6 years ago in reply to Yordan Kovachev

Prodigy 60 points

1) My questions regard the UPP peripheral on the OMAP-L138.

2) Our application uses both the A & B channel in 8 & 6 bit RX modes respectively..

The signals I was referring to appear at UPP_CHA_WAIT - T15 and UPP_CHB_WAIT - G3.

I understand they can be selected in PINMUX13 & PINMUX18

These are currently no connect pins on our board

My question is

If this flow control is not needed, can this pin be omitted"

0 Yordan Kovachev over 6 years ago in reply to Francis Judson

TI__Guru**** 161600 points

Hi,
1
See Section 33.2.5 Protocol Description, Table 33-5. Required Signals for Various Modes of OMAP-L138 Technical reference manual.
Wait singal is NOT required in Transmit mode. In receive mode it is required. It is part of the UPP protocol.

If this flow control is not needed, can this pin be omitted

If in receive mode you don't need to halt the transmitter, then you should be able to get the upp working without the wait signal.

Best Regards,
Yordan

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OMAP-L138: UPP WAIT and FIFO questions