TMS320C6746: How to Connect Two C6746 DSPs Together Using EMIF and HPI

Bob Kean

Part Number: TMS320C6746
Other Parts Discussed in Thread: OMAPL138

We need to use two C6746 DSPs in a new design that will essentially combine functions from two previous boards. We found an application report (SPRA536B) that details how to connect the EMIF bus from one C6000 DSP to the HPI bus of a second C6000 DSP. The article is from 2003 and mentions using the C64x DSP, but the C67x was not available yet. Will the same method work on the newer DSP? Are there any changes to the methodology? Is there an updated application note for this?

over 6 years ago

0 Yordan Kovachev over 6 years ago

TI__Guru**** 161600 points

Hi,

Yes, as far as I know this is the latest application report for this type of connection. You should be able to use it for TMS320C6746 devices as well.

Best Regards,
Yordan

0 RandyP over 6 years ago

TI__Guru* 84110 points

Bob,

In addition, you might consider the C6657 DSP that has two C66x cores in it. Depending on your I/O requirements, the DSP performance would be quite capable of doing what the two C6748 could do.

The C66x is an upgrade from the C674x and is fully code compatible, with the exception of device changes, of course. All of your processing code will move up with simple changes to some addresses.

Regards,
RandyP

0 Nadeem Zaki over 6 years ago in reply to Yordan Kovachev

TI__Prodigy 150 points

Hello Yordan,

Could you please provide more guidance on how to use the translate the app note to work with the TMS320C6746? For instance, will the pin out translation below work?

EMIF C6701	HPI C6701	EMIF C6746	HPI C6746
ED0	HD0	EMA_D[0]	UHPI_HD[0]
ED1	HD1	EMA_D[1]	UHPI_HD[1]
ED2	HD2	EMA_D[2]	UHPI_HD[2]
ED3	HD3	EMA_D[3]	UHPI_HD[3]
ED4	HD4	EMA_D[4]	UHPI_HD[4]
ED5	HD5	EMA_D[5]	UHPI_HD[5]
ED6	HD6	EMA_D[6]	UHPI_HD[6]
ED7	HD7	EMA_D[7]	UHPI_HD[7]
ED8	HD8	EMA_D[8]	UHPI_HD[8]
ED9	HD9	EMA_D[9]	UHPI_HD[9]
ED10	HD10	EMA_D[10]	UHPI_HD[10]
ED11	HD11	EMA_D[11]	UHPI_HD[11]
ED12	HD12	EMA_D[12]	UHPI_HD[12]
ED13	HD13	EMA_D[13]	UHPI_HD[13]
ED14	HD14	EMA_D[14]	UHPI_HD[14]
ED15	HD15	EMA_D[15]	UHPI_HD[15]
EA2	HHWIL	EMA_BA[1]	UHPI_HHWIL
EA3	HCNTL[0]	EMA_A[0]	UHPI_HCNTL[0]
EA4	HCNTL[1]	EMA_A[1]	UHPI_HCNTL[1]
/CE1	/HCS	/EMA_CS[2]	/UHPI_HCS
/BE0	HBE0
/BE1	HBE1
/ARE	/HDS2	/EMA_OE	/UHPI_HDS2
/AOE	HR/W	EMA_A_R/W	UHPI_HR/W
/AWE	/HDS1	/EMA_WE	/UHPI_HDS1
ARDY	/HRDY	/EMA_WAIT[0]	/UHPI_HRDY
VCC	/HAS	VCC	/UHPI_HAS
/EXT_INT7	/HINT	GPIO Pin	/UHPI_HINT

Are there any similar translations on the software side that we need to be aware of?

Best,
Nadeem

0 Mukul Bhatnagar over 6 years ago in reply to Nadeem Zaki

TI__Guru* 78475 points

Hi Nadeem
Please see the following post
e2e.ti.com/.../532126
The OMAPL138 and C6746 belong to the same family of devices.

No software examples/driver code available for this though.

Regards
Mukul

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TMS320C6746: How to Connect Two C6746 DSPs Together Using EMIF and HPI