TheTTL - Al Kossow's Bitsavers

TIFPGA529
FIELD·PROGRAMMABLE GATE ARRAY (8 x 8 x 8)
PROGRAMMING PROCEDURE (Continued)
A linear .select method is used to program array fuses. Each fuse can be opened by selecting the appropriate
(one to 16) input line and then pulsing the correct (one of 8) product line. The levels for selecting input and
product lines are shown in Tables 1 and 2.
Step 1:
Step 2:
Step 3:
Step 4:
Step 5:
Step 6:
Step 7:
Raise OE1 and OE2 to VIH.
Raise not-selected inputs to VIH.
Raise the selected input to VIH or VIL in accordance with Table 1.
Raise VCC from 5 V to Vccp.
Blow the fuse by pulsing the appropriate output to VIHH in accordance with Table 2.
Return VCC to 5 V and pulse the sel~cted input. The appropriate output will switch from VOL
to VOH.
Return OE1 and OE2 to VIL.
Steps 1 through 7 may be repeated if the verification does not indicate that the fuse was successfully programmed
(blown), but no more than four times.
TABLE 1. INPUT SELECT LINE
INPUT
PIN NAME
LINE PIO Pil PI2 PI3 PI4 PI5 PI6
0 L HH HH HH HH HH HH
1 H HH HH HH HH HH HH
2 HH L HH HH HH HH HH
3 HH H HH HH HH HH HH
4 HH HH L HH HH HH HH
5 HH HH H HH HH HH HH
6 HH HH HH L HH HH HH
7 HH HH HH HH HH HH HH
8 HH HH HH HH L HH HH
9 HH HH HH HH H HH HH
10 HH HH HH HH HH L HH
11 HH HH HH HH HH H HH
12 HH HH HH HH HH HH L
13 HH HH HH HH HH HH H
14 HH HH HH HH HH HH HH
15 HH HH HH HH HH HH HH
PI7 OEl OE2
HH H H
HH H H
HH H H
HH H H
HH H H
HH H H
HH H H
HH H H
HH H H
HH H H
HH H H
HH H H
HH H H
HH H H
L H H
H H H
(,)
'0,
o
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:c
ca
E
ca ...
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... o
c..
I
"'0
Qi
u:
TABLE 2. PRODUCT TERM SELECT
PRODUCT
TERM
0
1
2
3
4
5
6
7
POO
HH
X
X
X
X
X
X
X
POl
X
HH
X
X
X
X
X
X
P02
X
X
HH
X
X
X
X
X
PIN NAME
P03 P04 P05
X X X
X X X
X X X
HH X X
X HH X
X X HH
X X X
X X X
P06
X
X
X
X
X
X
HH
X
P07
X
X
X
X
X
X
X
HH
H = VIH
L = VIL
HH = Program pulse input voltage
X = Don't care
TEXAS -1.!1
INSTRUMENTS
POST OFFICE BOX 225012 • DALLAS. TEXAS 75265
3-.155