MIL-M-38510/502A
4.6.3.2 Verify product term.
a. Set GND (pin 14) to 0 V, and VCC (pin 28) to VCCS. b. Enable the chip by setting CE (pin 19) to VIL.
c. Set inputs I0 through I15 to VIH and VIL.
d. Address the P-term to be verified (No. 0 through 47) by applying the corresponding binary code to input variables I0 through I5.
e. To determine the status of the Pn link in the "OR" matrix for each output function FP or FP sense, the state of outputs F0 through F7. The status of the link is given by the following truth table:
Output |
P-term link |
|
Active high (FP) |
Active low (FP0) |
|
0 1 |
1 0 |
Fused Present |
f. Repeat steps d and e for all other P-terms. g. Remove VCCS from VCC.
h. For class S and B devices, if any bit does not verify as programmed it shall be considered a
programming reject.
4.7 Programming procedure for circuit B. The programmed specifications on table V and the following procedures shall be used for programming the device.
4.7.1 Program "PRODUCT (AND)" matrix.
4.7.1.1 All 48 AND gates of the product matrix are fuse linked to both the true and false lines of every input buffer in the initial unprogrammed state. The initial logic expression for the 48 unprogrammed AND gates is I0 0 I0 0 I1
0 I1 0 I15 0 I15 (where In or In is defined to be an input term). Programming the fuse located by the selection of an input line, 'in" and the mth AND gate replaces the input term In with "1" in the logic expression for the mth AND gate.
a. Connect pin 28 (VCC) to 5.0 V.
b. Connect pin 14 (GND) to ground.
c. Connect pin 19 ( CE ) to a TTL HIGH level.
d. Apply TTL levels to pins 10 through 13, 15, and 16 (F7 through F2) to address an on chip one of forty eight decoder to select the AND gate to be programmed (F7 = LSB and F2 = MSB).
e. Apply 12.0 V to all input pins (I0 through I15).
f. Apply the proper TTL level to an Ix input pin as follows (program one input at a time):
1. If the product term to be programmed contains the input term Ix (where x = 0 through 15), lower the Ix pin to a TTL HIGH level.
2. If the product term to be programmed contains the input term Ix, lower the I x to a TTL LOW
level.
3. If the product term does not contain the input terms I x or Ix (i.e., Ix is a DON'T CARE input), perform steps f1, g, f2, and g.
g. Apply a 15 V programming pulse to pin 1 (FE) according to the programming specification table.
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