Connecting K60D100m to External flash using flex bus interface

venkataprasad — Thu, 07 May 2015 11:39:56 GMT

Hi,

We are working on K60 evalution board to connect to micron external flash (M29W128GL) , using flex bus configuration (16 bit address and 16 bit data) in multiplexed mode. We have taken care of AD0 pin which is used only for data and not for address.

We are following example code of flexbus given by freescale.

IDE : IAR embedded workbench

please let me know if we are missing anything from the initialization code.

Even we are using micron flash drivers for flash init and checking comapatability but not getting right values.

void TWRK60_flexbus_init(void)

{

/* Enable the FlexBus */

/* Configure the FlexBus Registers for 8-bit port size */

/* with separate address and data using chip select 0 */

/* These configurations are specific to communicating with */

/* the MRAM used in this example */

/* For K60 tower module - do not set byte lane shift so that data */

/* comes out on AD[31:24] */

//Set Base address

FB_CSAR0 = (uint32)&MRAM_START_ADDRESS; //0x60000000

FB_CSCR0 = FB_CSCR_PS(1) // 8-bit port - Changed to FB_CSCR_PS(2) // 16 bit port

| FB_CSCR_AA_MASK // auto-acknowledge

| FB_CSCR_ASET(0x1) // assert chip select on second clock edge after address is asserted

| FB_CSCR_WS(0x2) // 1 wait state - may need a wait state depending on the bus speed

;

FB_CSCR0 |= FB_CSCR_BLS_MASK ; Do we need to do this for k60??

FB_CSMR0 = FB_CSMR_BAM(0x7) //Set base address mask for 512K address space

| FB_CSMR_V_MASK //Enable cs signal

;

//enable BE signals - note, not used in this example

FB_CSPMCR = 0x02200000;

//fb clock divider 3

SIM_CLKDIV1 |= SIM_CLKDIV1_OUTDIV3(0x3); // tried changing this also

// Set the GPIO ports clocks

SIM_SCGC5 = SIM_SCGC5_PORTA_MASK | SIM_SCGC5_PORTB_MASK | SIM_SCGC5_PORTC_MASK |

SIM_SCGC5_PORTD_MASK | SIM_SCGC5_PORTE_MASK;

/* Configure the pins needed to FlexBus Function (Alt 5) */

/* this example uses low drive strength settings */

//address

PORTB_PCR11 = PORT_PCR_MUX(5); // fb_ad[18]

PORTB_PCR16 = PORT_PCR_MUX(5); // fb_ad[17]

PORTB_PCR17 = PORT_PCR_MUX(5); // fb_ad[16]

PORTB_PCR18 = PORT_PCR_MUX(5); // fb_ad[15]

PORTC_PCR0 = PORT_PCR_MUX(5); // fb_ad[14]

PORTC_PCR1 = PORT_PCR_MUX(5); // fb_ad[13]

PORTC_PCR2 = PORT_PCR_MUX(5); // fb_ad[12]

PORTC_PCR4 = PORT_PCR_MUX(5); // fb_ad[11]

PORTC_PCR5 = PORT_PCR_MUX(5); // fb_ad[10]

PORTC_PCR6 = PORT_PCR_MUX(5); // fb_ad[9]

PORTC_PCR7 = PORT_PCR_MUX(5); // fb_ad[8]

PORTC_PCR8 = PORT_PCR_MUX(5); // fb_ad[7]

PORTC_PCR9 = PORT_PCR_MUX(5); // fb_ad[6]

PORTC_PCR10 = PORT_PCR_MUX(5); // fb_ad[5]

PORTD_PCR2 = PORT_PCR_MUX(5); // fb_ad[4]

PORTD_PCR3 = PORT_PCR_MUX(5); // fb_ad[3]

PORTD_PCR4 = PORT_PCR_MUX(5); // fb_ad[2]

PORTD_PCR5 = PORT_PCR_MUX(5); // fb_ad[1]

PORTD_PCR6 = PORT_PCR_MUX(5); // fb_ad[0]

//data

PORTB_PCR20 = PORT_PCR_MUX(5); // fb_ad[31] used as d[7]

PORTB_PCR21 = PORT_PCR_MUX(5); // fb_ad[30] used as d[6]

PORTB_PCR22 = PORT_PCR_MUX(5); // fb_ad[29] used as d[5]

PORTB_PCR23 = PORT_PCR_MUX(5); // fb_ad[28] used as d[4]

PORTC_PCR12 = PORT_PCR_MUX(5); // fb_ad[27] used as d[3]

PORTC_PCR13 = PORT_PCR_MUX(5); // fb_ad[26] used as d[2]

PORTC_PCR14 = PORT_PCR_MUX(5); // fb_ad[25] used as d[1]

PORTC_PCR15 = PORT_PCR_MUX(5); // fb_ad[24] used as d[0]

//control signals

PORTB_PCR19 = PORT_PCR_MUX(5); // fb_oe_b

PORTC_PCR11 = PORT_PCR_MUX(5); // fb_rw_b

PORTD_PCR1 = PORT_PCR_MUX(5); // fb_cs0_b

PORTD_PCR0 = PORT_PCR_MUX(5); // fb_ale

}

Re: Connecting K60D100m to External flash using flex bus interface

Hui_Ma — Fri, 08 May 2015 03:38:04 GMT

Hi,

From attached code, the 16-bit data port seems using FB_AD[31:24] pins as data port, which should belongs to below connection:

Then the CSCRn[BLS] bit should be 0.

As this connection, the FB_AD[31:24] should be 16-bit data port's high byte; and FB_AD[23:16] should be the low byte of 16-bit data port.

If it is possible, if customer could post the Flexbus related schematics for the double check.

Wish it helps.

Have a great day,
Ma Hui

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Connecting K60D100m to External flash using flex bus interface

Re: Connecting K60D100m to External flash using flex bus interface