//=============================================================================
// STOSB,STOSW
// Store string data to memory.
//
//
// 2009-2013 Robert Finch
// Stratford
// robfinch@finitron.ca
//
//
// This source file is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This source file is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see .
//
//=============================================================================
//
STOS:
if (pe_nmi) begin
rst_nmi <= 1'b1;
int_num <= 8'h02;
ir <= `NOP;
state <= INT2;
end
else if (irq_i & ie) begin
ir <= `NOP;
state <= INTA0;
end
else if (w && (di==16'hFFFF)) begin
ir <= `NOP;
int_num <= 8'd13;
state <= INT2;
end
else if (repdone)
state <= IFETCH;
else begin
if (!cyc_o) begin
cyc_type <= `CT_WRMEM;
lock_o <= w;
cyc_o <= 1'b1;
stb_o <= 1'b1;
we_o <= 1'b1;
adr_o <= esdi;
dat_o <= (w & df) ? ah : al;
end
else if (ack_i) begin
cyc_type <= `CT_PASSIVE;
if (repz|repnz) begin
state <= w ? STOS1 : STOS;
cx <= cx_dec;
end
else
state <= w ? STOS1 : IFETCH;
lock_o <= w;
cyc_o <= w;
stb_o <= 1'b0;
we_o <= 1'b0;
if (df)
di <= di_dec;
else
di <= di_inc;
end
end
STOS1:
begin
cyc_type <= `CT_WRMEM;
cyc_o <= 1'b1;
stb_o <= 1'b1;
we_o <= 1'b1;
adr_o <= esdi;
dat_o <= df ? al : ah;
state <= STOS2;
end
STOS2:
if (ack_i) begin
cyc_type <= `CT_PASSIVE;
if (repz|repnz)
state <= STOS;
else
state <= IFETCH;
lock_o <= 1'b0;
cyc_o <= 1'b0;
stb_o <= 1'b0;
we_o <= 1'b0;
if (df)
di <= di_dec;
else
di <= di_inc;
end
