User:Robertbaruch

Staging ground

ATF22V10C

At some point prior to Jul 2010, Atmel decided to make their own 22V10. It is pin- and fuse-compatible with the Lattice GAL22V10, but with additional features:

• I/O pin-keeper circuits, holding the previous value of an input after the input goes high-impedance.
• Optional pin-controlled power-down mode. This mode is controlled by a fuse not present in the Lattice chip.

Atmel Datasheet rev Jul 2010, see [1] for page 9 without the diagram cut off.

Lattice Datasheet rev Mar 1998.

The best view of the fuses is shown in page 5 of the Lattice datasheet, showing 5892 fuses.

The fuses are organized as follows:

• 0-43: product term for asynchronous reset
• 44-439: sum of 8 product terms for output logic block 0
• 440-923: sum of 10 product terms for output logic block 1
• 924-1495: sum of 12 product terms for output logic block 2
• 1496-2155: sum of 14 product terms for output logic block 3
• 2156-2903: sum of 16 product terms for output logic block 4
• 2904-3651: sum of 16 product terms for output logic block 5
• 3652-4311: sum of 14 product terms for output logic block 6
• 4312-4883: sum of 12 product terms for output logic block 7
• 4884-5367: sum of 10 product terms for output logic block 8
• 5368-5763: sum of 8 product terms for output logic block 9
• 5764-5807: product term for synchronous preset
• 5808-5827: control fuses, 2 each, for output logic blocks
• 5828-5891: 8 bytes of programmable electronic signature data

A security fuse is present, but its number is not in the datasheet.

Enable programming mode

In programming mode, the following pins have alternate functions. Pin numbering is for the DIP/SOIC/TSSOP(PLCC) package.

• pin 2(3): PRogramming ENable
• pin 13(16): -STRobe
• pin 3(4): WRite
• pins 4(5), 6(7), 7(9), and 9(11): ERase
• pin 8(10): OLMC data

Programming mode is enabled by applying 12V to PREN. PREN must remain at 12V for at least 50 milliseconds before beginning any other operation.