1   CPLD ATF1

Name     XorTest1502 ;
PartNo   U1 ;
Date     10/04/2024 ;
Revision 01 ;
Designer Engineer ;
Company  None ;
Assembly None ;
Location  ;
Device f1502ispplcc44;

Navrh 1:

Name     ATF1_GLUE;
PartNo   0001;
Date     2026-06-13;
Revision 0.1;
Designer ChatGPT;
Device   f1504ispplcc100;

/************************************************************/
/* INPUTS                                                   */
/************************************************************/

PIN = CA0;
PIN = CA1;
PIN = CA2;
PIN = CA3;
PIN = CA4;
PIN = CA5;
PIN = CA6;
PIN = CA7;
PIN = CA8;
PIN = CA9;
PIN = CA10;
PIN = CA11;
PIN = CA12;
PIN = CA13;
PIN = CA14;
PIN = CA15;

PIN = E;
PIN = RW;
PIN = RESET;
PIN = HALT;

/************************************************************/
/* OUTPUTS                                                  */
/************************************************************/

PIN = MR0;
PIN = MR1;
PIN = MR2;
PIN = MR3;

PIN = DEV0;
PIN = DEV1;
PIN = DEV2;
PIN = DEV3;
PIN = DEV4;
PIN = DEV5;
PIN = DEV6;
PIN = DEV7;

PIN = READ_N;
PIN = WRITE_N;

/************************************************************/

FIELD CA = [CA15..CA0];
FIELD MR = [MR3..MR0];

/************************************************************/
/* ADDRESS DECODE                                           */
/************************************************************/

NATIVE_RAM_LO = !CA15;

EMS1_WINDOW =
      CA15
    & !CA14
    & !CA13
    & !CA12;

EMS2_WINDOW =
      CA15
    & !CA14
    & !CA13
    &  CA12;

REG0 = (CA:$A000);
REG1 = (CA:$A001);
REG2 = (CA:$A002);
REG3 = (CA:$A003);
REG4 = (CA:$A004);
REG5 = (CA:$A005);

REG_MIRROR =
      (CA >= $A006)
    & (CA <= $A01F);

DEVICE_AREA =
      (CA >= $A020)
    & (CA <= $A0FF);

ROM_AREA =
      (CA >= $A100);

/************************************************************/
/* MEMORY REGION BUS                                        */
/************************************************************/

MR = 0;

IF NATIVE_RAM_LO THEN MR = 0;       /* 0000 */
IF EMS1_WINDOW   THEN MR = 1;       /* 0001 */
IF EMS2_WINDOW   THEN MR = 2;       /* 0010 */

IF REG0 THEN MR = 8;                /* 1000 */
IF REG1 THEN MR = 9;                /* 1001 */
IF REG2 THEN MR = 10;               /* 1010 */
IF REG3 THEN MR = 11;               /* 1011 */
IF REG4 THEN MR = 12;               /* 1100 */
IF REG5 THEN MR = 13;               /* 1101 */

IF REG_MIRROR THEN MR = 15;         /* 1111 */

IF DEVICE_AREA THEN MR = 4;         /* 0100 */

IF ROM_AREA THEN MR = 3;            /* 0011 */

/************************************************************/
/* READ / WRITE                                             */
/************************************************************/

READ_N  = !(E & RW);
WRITE_N = !(E & !RW);

/************************************************************/
/* DEVICE SELECTS                                           */
/************************************************************/

/* default inactive */

DEV1 = 1;
DEV2 = 1;
DEV3 = 1;
DEV4 = 1;
DEV5 = 1;
DEV6 = 1;
DEV7 = 1;

/************************************************************/
/* DEV0 (System RAM)                                        */
/************************************************************/

/*
 * EMS windows:
 *   ATF1 releases DEV0
 *   ATF2 drives DEV0
 */

DEV0 = !(NATIVE_RAM_LO # ROM_AREA);
EMS_WINDOW = EMS1_WINDOW # EMS2_WINDOW;

DEV0.OE = !EMS_WINDOW;

/************************************************************/
/* DEVICE BLOCK                                             */
/************************************************************/

DEV1 = !(
       DEVICE_AREA
    & !CA7
    & !CA6
    & !CA5
);

DEV2 = !(
       DEVICE_AREA
    & !CA7
    & !CA6
    &  CA5
);

DEV3 = !(
       DEVICE_AREA
    & !CA7
    &  CA6
    & !CA5
);

DEV4 = !(
       DEVICE_AREA
    & !CA7
    &  CA6
    &  CA5
);

DEV5 = !(
       DEVICE_AREA
    &  CA7
    & !CA6
    & !CA5
);

DEV6 = !(
       DEVICE_AREA
    &  CA7
    & !CA6
    &  CA5
);

DEV7 = !(
       DEVICE_AREA
    &  CA7
    &  CA6
    & !CA5
);