6. Translation Formats
UniSite-xpi User Manual
6-41
The C field, the fuse information checksum field, is used to detect
transmitting and receiving errors. The field contains a 16-bit sum
(modulus 65535) computed by adding 8-bit words containing the fuse
states for the entire device. The 8-bit words are formed as shown in the
following figure. Unused bits in the final 8-bit word are set to zero before
the checksum is calculated.
Following is an example of full specification of the L, C, and F fields:
F0*L0 01010101* L0008 01010111* L1000 0101*C019E*
Following is an alternate way of defining the same fuse states using the K
field:
F0*K0 55* K0008 57* K1000 5* C019E*
Another example, where F and C are not specified:
L0200 01101010101010101011
010111010110100010010010010*
The Security Fuse Field (G)
<security fuse>::=’G’<binary-digit>’*’
The JEDEC G field is used to enable the security fuse of some logic
devices. To enable the fuse, send a 1 in the G field:
G1
*
The Note Field (N)
<note>::=’N’<field characters>’*’
The note field is used in JEDEC transmission to insert notes or comments.
The programmer will ignore this field; it will not be interpreted as data.
An example of a note field would be:
N Test Preload*
The Value Fields (QF, QP,
and QV)
JEDEC value fields define values or limits for the data file, such as
number of fuses. The QF subfield defines the number of fuses in the
device. All of the value fields must occur before any device programming
or testing fields appear in the data file. Files with ONLY testing fields do
not require the QF field, and fields with ONLY programming data do not
require the QP and QV fields.
The QF subfield tells the programmer how much memory to reserve for
fuse data, the number of fuses to set to the default condition, and the
number of fuses to include in the fuse checksum. The QP subfield defines
the number of pins or test conditions in the test vector, and the QV
subfield defines the maximum number of test vectors.
Word 00
Fuse No.
msb
7
6
5
4
3
2
1
lsb
0
Word 01
Fuse No.
msb
15
14
13
12
11
10
9
lsb
8
Word 62
Fuse No.
msb
503
-
-
-
499
498
497
lsb
496
Summary of Contents for UniSite-xpi
Page 2: ...981 0014 UniSite Programming System User Manual Also Covering Legacy UniSite Programmers ...
Page 72: ...2 Setup and Installation 2 42 UniSite xpi User Manual ...
Page 134: ...3 Getting Started 3 62 UniSite xpi User Manual ...
Page 238: ...5 Computer Remote Control 5 10 UniSite xpi User Manual ...
Page 296: ...6 Translation Formats 6 58 UniSite xpi User Manual ...
Page 402: ...Keep Current Subscription Service 6 Keep Current ...