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CS80C286-12 Datasheet(PDF) 10 Page - Intersil Corporation |
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CS80C286-12 Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 13 page 3-137 80C286/883 NOTES: 1. PEACK always goes active during the first bus operation of a processor extension data operand transfer sequence. The first bus operation will be either a memory read at operand address or I/O read at port address 00FA(H). 2. To prevent a second processor extension data operand transfer, the worst case maximum time (shown above) is 3 x - 12AMAX -(4)MIN The actual, configuration dependent, maximum time is: 3 x - 12AMAX - (4) MIN +N x 2 x (1). N is the number of extra T C states added to either the first or second bus operation of the processor extension data operand transfer sequence. FIGURE 6. 80C286/883 PEREQ/PEACK TIMING FOR ONE TRANSFER ONLY NOTES: 1. Setup time for RESET ↑ may be violated with the consideration that φ1 of the processor clock may begin one system CLK period later. 2. Setup and hold times for RESET ↓ must be met for proper operation, but RESET ↓ may occur during φ1 or φ2. 3. The data bus is only guaranteed to be in a high impedance state at the time shown. FIGURE 7. INITIAL 80C286/883 PIN STATE DURING RESET Waveforms (Continued) 1 12A φ2 CLK φ1 φ2 φ2 φ1 φ2 φ1 φ1 φ2 TI TS TC TS TC TI VCH VCL CLK S1 • S0 PEACK M/IO, A23 -A0 COD INTA PEREQ MEMORY ADDRESS IF PROC. EXT. TO MEMORY TRANSFER I/O PORT ADDRESS 00FA(H) IF MEMORY TO PROC. EXT. TRANSFER 12B 5 4 I/O PORT ADDRESS 00FA(H) IF PROC. EXT. TO MEMORY TRANSFER MEMORY ADDRESS IF MEMORY TO PROC. EXT. TRANSFER BUS CYCLE TYPE (SEE NOTE 1) (SEE NOTE 2) I/0 READ IF PROC. EXT. TO MEMORY MEMORY READ IF MEMORY TO PROC. EXT MEMORY WRITE IF PROC. EXT. TO MEMORY I/O WRITE IF MEMORY TO PROC. EXT. 1 1 12B TX S1 • S0 BUS CYCLE TYPE φ2 φ2 φ2 φ2 φ2 φ1 φ1 φ1 φ1 TX TX TI CLK VCH VCL 6 7 6 (SEE NOTE 1) PEACK A23 - A0 BHE M/IO COD/INTA AT LEAST 16 CLK PERIODS UNKNOWN UNKNOWN UNKNOWN UNKNOWN UNKNOWN 13 13 13 15 (SEE NOTE 3) LOCK DATA HILDA 16 (SEE NOTE 2) RESET |
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