From 879cf556c8f7e47c55bc6585e0661d9aa86cf406 Mon Sep 17 00:00:00 2001 From: adam Date: Tue, 14 Mar 2006 14:54:51 +0100 Subject: [PATCH] Corrected meaning of z-octet bits 2-4 in IOBs --- doc/atmel.txt | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/doc/atmel.txt b/doc/atmel.txt index 5a7867a..28a480d 100644 --- a/doc/atmel.txt +++ b/doc/atmel.txt @@ -33,6 +33,7 @@ Corrections 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 @@ -234,8 +235,10 @@ Block Memories 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 @@ -253,15 +256,15 @@ I/O Blocks +--------+--------+--------+------+-------+-------+--------+--------+--------+ |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 | +--------+--------+--------+------+-------+-------+--------+--------+--------+ -- 1.7.10.4