2005.08.12 [gosset] Initial revision
2006.03.12 [megacz] Swapped {L1,L0}->W, FB->{L0,L1}, {H0->L0,H1->L1}
2006.03.13 [megacz] Fixed lowest bit of z=00000000; it should be "1"
+ 2006.03.13 [megacz] Corrected meaning of z-octet bits 2-4 in IOBs
Background
I/O Blocks
The Z octet for I/O resources always its most significant three bits
- set to 011. The next two bits are either 01 for a primary IOB or 10
- for a secondary.
+ set to 011. The next bit is 1 for North/South IO Blocks and 0 for
+ East/West IO Blocks. The next bit is always 0, and the bit
+ following that is set to 0 for primary (orthogonally connected)
+ IOBs, 1 for secondary (diagonally connected) IOBs.
S = Sector wires of this cell
S+ = Sector wires of next cell
+--------+--------+--------+------+-------+-------+--------+--------+--------+
|Z octet | D octet |
+--------+--------+--------+------+-------+-------+--------+--------+--------+
- |011__000| Schmit | Slew |~G2->CR| | Pull | |
+ |011_0_00| Schmit | Slew |~G2->CR| | Pull | |
+--------+--------+--------+------+-------+-------+--------+--------+--------+
- |011__001|REG->OUT| | OE | Output Mux |
+ |011_0_01|REG->OUT| | OE | Output Mux |
+--------+--------+--------+------+-------+-------+--------+--------+--------+
|011_0010| Added Delay (primary) |PRI->S-| PRI->G+| PRI->G | PRI->S |
+--------+--------+--------+------+-------+-------+--------+--------+--------+
- |011_1010| Added Delay (secondary) |SND->S | SND->S+|PRI->REG|SND->REG|
+ |011_0110| Added Delay (secondary) |SND->S | SND->S+|PRI->REG|SND->REG|
+--------+--------+--------+------+-------+-------+--------+--------+--------+
- |011__011| OEM | USEOEM | OEM |
+ |011_0_11| OEM | USEOEM | OEM |
+--------+--------+--------+------+-------+-------+--------+--------+--------+