topic Re: IFC GPCM Burst Mode versus Address LS2044 in Layerscape

IFC GPCM Burst Mode versus Address LS2044

benoitmasse — Tue, 17 Nov 2020 02:14:06 GMT

Hi !

IFC in GPCM mode, 20 bit address.

The limit size of burst, is it limited by the number of bits on the unmuxed address bus ?

Let say we have a bus with 20 bit,

LSB are connected to A3-A2-A1-A0 and MSB are connected to AD15-0.

In case of 8 bits, the longest burst will be 16 beats.

In case of 16 bits, the longest burst will be 8 beats.

Merci beaucoup, Thank a lot

Is this is correct ?

Re: IFC GPCM Burst Mode versus Address LS2044

ufedor — Tue, 17 Nov 2020 06:26:33 GMT

Please consider that general address connection for the 8-bit data bus is:

IFC_A[11:0] -> A[11:0]

IFC_AD[15:0] -> A[27:12]

and for 16-bit data bus it is:

IFC_A[11:1] -> A[10:0]

IFC_AD[15:0] -> A[26:11]

The GPCM burst length is determined by the CSORn_GPCM[BURST_LEN] - refer to the QorIQ LS2088A Reference Manual, 17.3.6 Chip-Select Option register - GPCM (CSOR0_GPCM - CSOR7_GPCM).