Design Considerations for ISR Programming of Cypress CPLDs
3
The C3ISR cable offers the most flexible choice of program-
ming voltage and device support. Any selection of 5V, 3.3V,
2.5V, or 1.8V can power the cable (V
CC
of ISR connector pin),
allowing TTL, LVT TL, LV CM OS, LVCMOS2, or LVCMOS18
ISR signal levels. The C3ISR cable is the recommended
choice for ISR designs if the user does not need to program
F
LASH
370i devices. A schematic of the C3ISR cable is shown
in Figure 2.
The UltraISR PC cable contains a simple buffer capable of 5V
and 3.3V signaling. The UltraISR cable schematic is shown
in Figure 3. Both the C3ISR and UltraISRPCCABLE can be
used to program all ISR families at 3.3V or 5V levels, with the
exception of F
LASH
370i devices (since these require a 12V
supervoltage generated by the cable on the ISRen pin).
The ISRPCCABLE, on the other hand, is the only cable with
a built-in 5V-to-12V DC/DC converter to produce the 12V su-
pervoltage to the ISRen pin required for F
LASH
370i program-
ming, supplied by 5V from the user’s board. The schematic
for the ISRPCCABLE, used for programming the F
LASH
370i
devices, is shown in Figure 4.
The ISRPCCABLE allows programming of the F
LASH
370i and
Ultra37000 device families (but not Ultra37000V). The ISR-
PCCABLE (revision 0.03A or greater) can be used to program
Ultra37000 devices because their JTAGen pin, if present on
the selected package, is 12V tolerant. This means that the
application of 12V on the Ultra37000’s JTAGen pin is equiva-
lent to placing a TTL HIGH value on the pin.
Figure 2. C3ISR Cable Schematic
1 2 34
A
B
C
D
4
321
D
C
B
A
1
14
2
15
3
16
4
17
5
18
6
19
7
20
8
21
9
22
10
23
11
24
12
25
13
JP1
PARALLEL PORT
1
2
3
4
5
6
7
8
9
10
P2
10P HEADER
R15
10
D1
MBR0520L
I.C.
1
I.C.
2
REF
3
CLK/SEL
4
GND
5
I.C.
6
/ONB
7
ONA
8
I.C.
9
I.C.
10
FB
11
PGND
12
LX
13
OUT
14
POUT
15
I.C.
16
U1
MAX1700
1 2
L1
DO3316P-103
GND
21
C2
100uF
C4
.22uF
C1
0.22uF
21
C3
100uF
C7
.22uF
VCC
R14
30
R1 39
R5 39
VCCIO
R2 39
R3 39
R4 39
C8
0.1uF
C9
0.01uF
R11
1K
VCC
B
CE
Q1
2N2222A
21
C6
100uF
21
C5
100uF
C10
0.1uF
C11
0.01uF
R12
20K
VCC
CONNECT GND PLANES
(ONE .020 TRACE)
VCC_BOOST
VCC_BOOST
++
++
R17
51 OHM 1/8W
D2
LED
VCC
G
1
A1
2
Y1
18
A2
4
Y2
16
A3
6
Y3
14
A4
8
Y4
12
U2A
SN74HC244DW
G
19
A1
11
Y1
9
A2
13
Y2
7
A3
15
Y3
5
A4
17
Y4
3
VCC
20
GND
10
U2B
SN74LVC244A
TCK_10PIN
TMS_10PIN
TDI_10PIN
ISR*_10PIN
JTAGen_10PIN
TCK_PAR
TDI_PAR
TMS_PAR
ISR*_PAR
VCCIO
VCC_BOOST
R18
200k
VCC
VCC
R10
4.7k
D3
3.9V ZENER (AZ23C3V9DICT-ND)
R13
200
VCCIO
VCCIO_clamped
R65.6k
R85.6k
R95.6k
R75.6k
R19100
R21100
R22100
R20100
TCK_2
TMS_2
TDI_2
ISR*_2
TCK_3
TMS_3
TDI_3
ISR*_3
JTAGenable_3
TCK_4
TMS_4
TDI_4
ISR*_4
JTAGenable_4
D4
BAW56ZXCT-ND
+
C16
10uF
+
C17
10uF
2
3
7
5
6
8
14 VCC
+VS
SHDN
GND
VEE
U3
LT1719
R23
2.2k
R24
1.6k
VCC
R25
20k
R26
9.1k
R16
1k
C14
0.1uF
C15
0.01uF
C12
0.1uF
C13
0.01uF
VCCIO_clamped
1
2
3
4
5
6
7
8
GND
A1
A2
A3 B3
B2
B1
GATE
9
10
11
12 13
14
15
16
17
18
19
20
21
22
23
24
A4
A5
A6
A7
A8
A9
A10
A11
B8
B9
B10
B11
B4
B5
B6
B7
U5
SN74TVC3010
VCCIO_clamped
1
2
3
4 5
6
7
8
IN
GND
GND
/OFF SET
GND
GND
OUT
U4
MAX604CSA
VCC
R27
0 (NP)
R29
1k
VCC
R30
30 (NP)
R28
0
VCCIO
R31 0 (NP)
R32 0
(51 páginas)
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