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coin
Joined: 30 Apr 2010
Posts: 2
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| Parallel flash and parallel master port |
 Posted: Tue May 04, 2010 1:27 am |
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Hi, I am using PIC24FJ256GB110 and MX29LV160DT parallel flash.
Flash is connected to PIC trough Parallel Master Port what is described in application note 1210 using fully multiplexed mode.
Lines Q0-Q7, CE#, OE#, WE#, A-1, PMALL and PMALH are connected to PIC's PMP lines. A16-A19 is connected to GND (in this moment I am not interested for upper part, just 64K). #RESET is connected to Vcc. WP# and BYTE# is connected to GND.
With this code I want to read manufacturer ID (C2 for this memory) but I have no results. I tried all combinations of configuration through PMCON. Every time answer is FF or 00. Where I'm wrong?
| Code: |
#include "pmode.h"
// define UART
#pin_select U1TX=PIN_G6
#pin_select U1RX=PIN_G7
#use rs232(UART1,baud=9600,parity=N,bits=8)
// define PMP mem interface
#word PMCON= 0x0600
#word PMMODE= 0x0602
#word PMADDR= 0x0604
#byte PMDOUT1= 0x0604
#byte PMDOUT2= 0x0606
#byte PMDIN1= 0x0608
#byte PMDIN2= 0x060A
#word PMAEN= 0x060C
#word PMSTAT= 0x060E
void PMPInit(void)
{
PMMODE = 0x0200; //Select Master mode with Read & Write on 2 separate pins
PMAEN = 0x8003; //Enable PMCS2 port
PMCON = 0x9360; //
}
void set_ports(void)
{
set_tris_d(0xF8C0); // A17, A18, A19, A-1
set_tris_f(0xFEFB); // BYTE, A16
delay_ms(2);
}
char MemByteRead(unsigned long Address)
{
unsigned int Temp;
while(PMMODE & 0x8000); //wait till PMP is busy
PMADDR = Address; //load Address to PMADDR
PMADDR |= 0x8000;
Temp = PMDIN1; //do a dummy read to initialize the read
while(PMMODE & 0x8000); //wait till PMP is busy
return(PMDIN1); //return the data read
}// end MemByteRead
void MemByteWrite(unsigned long Address, unsigned char Data)
{
while(PMMODE & 0x8000); //wait till PMP is busy
PMADDR = Address; //load Address to PMADDR
PMADDR |= 0x8000;
while(PMMODE & 0x8000); //wait till PMP is busy
PMDIN1 = Data; //write the Data
}//end MemByteWrite
unsigned char manufacturer_id(void)
{
unsigned char tmp;
MemByteWrite (0x0AAA, 0xAA);
MemByteWrite (0x0555, 0x55);
MemByteWrite (0x0AAA, 0x90);
tmp = MemByteRead(0x0000);
return tmp;
}
void main()
{
setup_spi( FALSE );
setup_spi2( FALSE );
setup_wdt(WDT_OFF);
setup_timer1(TMR_DISABLED|TMR_DIV_BY_1);
set_ports();
putc('A'); // just to indicate start of program
PMPInit();
putc(manufacturer_id());
for(;;);
} |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Wed May 05, 2010 3:45 pm |
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It's not completely clear to me, how you connected each Flash address line. If I understand right, you connected Pin "A-1" to
the PMBE port. But in byte mode of the device (#BYTE = L), A-1 is the lowest address line, so according to the "fully multiplexed"
scheme, it must be connected to the address latch LSB pin, I think. The other address pins are effectively shifted by one, pin "A0"
is the second address bit and so on. |
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coin
Joined: 30 Apr 2010
Posts: 2
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| Posted: Thu May 06, 2010 2:02 am |
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Thank you FvM for reply.
This board come to me finished, i cannot make modifications now.
Connection is fully multiplexed and table is:
Q0 - Q7 : E0 - E7
CE# : D10
OE# : D5
WE# : D4
WP# : D1
BYTE# : F2
RESET# : D2
RY/BY# : D12
A16 : F0
A17 : D0
A18 : D11
A19 : D9
A-1 : D3
PMALL : B15
PMALH : B14
So, this is good connection to PMP. Now i see that A-1 is address LSB in byte mode, so i will try 16 bit data. Thank's again. |
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