Dangerous Prototypes XT-IDE Boards

The Dangerous Prototypes 'V1' boards took the original XT-IDE design and ported some of the functionality into a small Xilinx 9500 series CPLD. Because of short supply of 5V parts, the design was modified to use a 3.3V CPLD experimentally, and after successful testing of this the design was then ported to an entirely 3.3V CPLD based implementation with the V2.

The CPLD reduces the component count (and hence cost), but many home assemblers are likely to be put off by the SMT components, although they are manageable with only basic tools.

BIOS

Any of the standard XT-IDE BIOS's can be used. Testing has been performed using the XTIDE universal BIOS, V1.15.

Varients

• V1 - XC9572 CPLD with some 74LS series ICs, all SMT
• V1a - Revised to use XC9572XL (3.3V); has errors
• V1b - Corrected V1a; works well
• V2 - TQFP-100 XC9572XL CPLD with no other ICs. See Dangerous Prototypes V2 Compatibility Notes

Resources

• Project Home Page
• Code Repository

Version 1

• The original cersion was never built, since the 5V XC9572 was discontinued before the board was finished
• The v1 board was made, but wasn't cut correctly
• The v1a board has a number of design errors, including 5 missing traces
• The v1b board is sound. When constructed, a minor change to the CSEL header pin (pin 28) should be made to ensure drive compatibility.

v1a

Farnell BoM:

Part(s)	Description	Package	Value	Qty Required	Farnell Code
C1,C3,C4,C5,C7	Ceramic Capacitor	C 0603	0.1uF	5	1833863
C2	Ceramic Capacitor	Case C	47uF	1	9695664
C6	Ceramic Capacitor	C 0603	1uF	10	1828801
DIP_SW	8-way DIP switch	DIL	SWITCH, DIL, 8WAY	1	9471596
IC Socket	IC Socket	DIP-28	SOCKET IC, DIL, 28WAY	1	1077330
IC1	EEPROM (64k as 8K x8)	DIL-28	28C64	1	1095784
IC2	74HC688DW	SOIC-20	74HC688DW	1	1740268
IC3, IC4	74HCT573D	SOIC-20	74HCT573D	2	1201309
IC5	74HCT245DW	SOIC-20	74HCT245DW	1	9591923
IC6	XC9572 72-cell 3.3v CPLD	VQ44	XC9572XL-10VQG44C	1	1605849
IDE1	40-pin IDE Header	MA20-2	HEADER, 2.54MM, BOXED, 2X20WAY	1	8395977
JP1, JP2, JP3, JP7	16-pin Jumper Header (cut for each)	2.54mm pitch	HEADER, 2ROW, 16WAY	1	3418546
JP4	3-pin Jumper Header	2.54mm pitch	HEADER, 1ROW, 3WAY	1	3417657
JP6	6-pin Jumper Header	2.54mm pitch	HEADER, 1ROW, 6WAY	1	1187827
LED1	Activity LED	0805	LED, SMD, RED	1	1226389
R1,R2,R3,R4,R5,R6,R7	Resistor	0603	RESISTOR, 10KR, 0.1W, 5%	7	1469749
RN1, RN2	Resistor Network	SIL9	RESISTOR NETWORK, 10K, ± 2%	2	9356819
VR1	Voltage Regulator	SOT-23-5	MIC5205-3.3YM5	1	1663083

v1b

Enhancements over v1a:

• Missing traces fixed
• Seperate resistor for on-board and header-attached activity LED
• Jumper to enable 5V CPLD to be used
• Jumper header to enable connection of IDE Pin 20 to VCC for Disk-On-Module use
• SMT resistor networks

Farnell BoM:

Part(s)	Description	Package	Value	Qty Required	Farnell Code
C1,C3,C4,C5,C7	Ceramic Capacitor	C 0603	0.1uF	5	1833863
C2	Electrolytic Capacitor	Case C	47uF	1	1973276
C6	Ceramic Capacitor	C 0603	1uF	1	1828801
DIP_SW	8-way DIP switch	DIL	SWITCH, DIL, 8WAY	1	9471596
IC Socket	IC Socket	DIP-28	SOCKET IC, DIL, 28WAY	1	1077330 or 1103852
IC1	EEPROM (64k as 8K x8)	DIL-28	28C64	1	1095784
IC2	74HC688DW	SOIC-20	74HC688DW	1	1740268
IC3, IC4	74HCT573D	SOIC-20	74HCT573D	2	9592083
IC5	74HCT245DW	SOIC-20	74HCT245DW	1	9591923
IC6	XC9572 72-cell 3.3v CPLD	VQ44	XC9572XL-10VQG44C	1	1605849
IDE1	40-pin IDE Header	MA20-2	HEADER 40WAY	1	1099261
JP1, JP2, JP5, JP6, JP7	Jumper Header (cut for each)	2.54mm pitch	HEADER, 1ROW, 14WAY	1	3418376 (10-pin) 3418303 (4-pin)
LED1	Activity LED	0805	LED, SMD, RED	1	1226389
R1,R2,R3,R4,R5, R7,R8,R9,R10	Resistor	0603	RESISTOR, 10KR, 0.1W, 5%	9	1469749
RN1, RN2	Resistor Network	0603	RESISTOR NETWORK, 10K, ± 2%	2	2060107
VR1	Voltage Regulator	SOT-23-5	MIC5205-3.3YM5	1	1663083
-	Jumpers	-	-	2	1740370
-	ISA Bracket	-	Keystone 9202	1	4567699
-	Panhead screws	-	SCREW MACHINE PHILLIPS 4-40X1/4	2	-

Notes:

• JP4 and R6 aren't required; short IDE header pins 28 and 30
• JP5 is needed only if a Disk-On-Module is likely to be used (to provide power via the header)
• JP3 (IRQ) is not needed
• R7 and the LED1 are needed only if activity indication on-board is required
• R10 and associated 2-pin header JP7 are needed only if remote activity indication is required
• SJ1 should be soldered closed if a 5V CPLD is used, otherwise left open

Version 2

The version 2 board is a sound design, with no modifications needed during construction.

Farnell BoM:

Part(s)	Description	Package	Value	Qty Required	Farnell Code
C1,C3..4,C7..11	Ceramic Capacitor X7R	0603	0.1uF	8	1759123
C2	Electrolytic Capacitor	Case C	47uF	1	1973276
C6	Ceramic Capacitor	0603	1uF	1	1833809
DIP_SW	8-way DIP switch	DIL	SWITCH, DIL, 8WAY	1	9471596
IC Socket	IC Socket	DIP-28	SOCKET IC, DIL, 28WAY	1	1103852
IC1	EEPROM (64k as 8K x8)	DIL-28	28C64	1	1095784
IC7	XC9572 72-cell 3.3v CPLD	TQFP100	XC9572XL	1	1193233
IDE1	40-pin IDE Header	MA20-2	HEADER 40WAY	1	1099261
JP1, JP2, JP6	Jumper Header (cut for each)	2.54mm pitch	HEADER, 1ROW, 10WAY	1	3418376
LED1	Activity LED	0805	LED, SMD, RED	1	1686066
R2..4	Resistor	0603	RESISTOR, 10KR, 0.1W, 5%	3	2008360
R6, R7	Resistor	0603	RESISTOR, 270R, 0.1W, 1%, 250mW	2	1738897
RN3, RN4	Resistor Network	1206	RESISTOR ARRAY, 10K	2	1770137
VR1	Voltage Regulator	SOT-23-5	MIC5205-3.3YM5	1	1663083
-	Jumpers	-	-	2	1740370
-	ISA Bracket	-	Keystone 9202	1	4567699
-	Panhead screws	-	SCREW MACHINE PHILLIPS 4-40X1/4	2	-

Notes:

• JP5 is needed only if a Disk-On-Module is likely to be used (to provide power via the header)
• JP3 (IRQ) is not needed
• R7 and the LED1 are needed only if activity indication on-board is required
• R10 and associated 2-pin header JP7 are needed only if remote activity indication is required

See Also

• Dangerous Prototypes V2 Compatibility Notes
• XT-IDE